To understand the sequestration characteristics and mechanisms of soil PhytOC(phytolith-occluded organic carbon)in large-diameter bamboo forests,the soil PhytOC accumulation of the P.edulis forests and B.emeiensis for...To understand the sequestration characteristics and mechanisms of soil PhytOC(phytolith-occluded organic carbon)in large-diameter bamboo forests,the soil PhytOC accumulation of the P.edulis forests and B.emeiensis forests in the karst and non-karst zones of southwest China were studied by the methods of field sampling,laboratory measurement,and statistic analysis.The study yielded the following results and conclusions:1)The PhytOC content and storage in the 0‒30 cm soil profile of the P.edulis forests range from 0.16‒1.85 g kg^(‒1)and 0.14‒1.41 t hm^(‒2),respectively.Similarly,the PhytOC content and storage in the 0‒30 cm soil profile of the B.emeiensis forests vary between 0.56‒2.44 g kg^(‒1)and 0.49‒2.07 t hm^(‒2),respectively.2)Stand age and bedrock type significantly influence the accumulation of soil PhytOC in both P.edulis forests and B.emeiensis forests.The mature forests exhibit the highest soil PhytOC content and storage in both types of bamboo forests.Additionally,the soil PhytOC content in karst bamboo forests is notably higher compared to that in the non-karst area.3)Soil available Si is identified as one of the critical factors affecting the soil PhytOC accumulation in bamboo forests.Results of the present study are of great significance for estimating the phytolith carbon sequestration capacity of bamboo forests and for bamboo forest construction and management aimed at enhancing carbon sequestration.展开更多
Plant species diversity is an important index reflecting the functional complexity and stability of ecosystems.Human activity can completely alter plant species diversity and cause serious degradation of ecosystems bu...Plant species diversity is an important index reflecting the functional complexity and stability of ecosystems.Human activity can completely alter plant species diversity and cause serious degradation of ecosystems but its impact on bamboo forest still lacks of systematic evaluation.In this study,we performed a field investigation to reveal the influences of human disturbances on the plant diversity and stability of Moso bamboo forests at Southern China.The selected bamboo fields contained different intensities of human activities that could be classified as slight,moderate and severe disturbance level.Species richness index S,Shannon-Wienner index H,Simpson index D,Pielou index Jsw,community similarity index IS and community stability index were employed to quantitatively evaluate the plant species diversity and stability.The survey revealed that there were 203 species belonging to 83 families and 108 genera in Moso bamboo forests.The number of plant species in the Moso bamboo forests decreased with the increasing of disturbance intensity.The species diversity indexes generally followed the order of slight>moderate>severe disturbance,as well as the richness index S,Shannon-Wienner index H and Pielou index Jsw.The similarity and species stability of the bamboo forest communities also decreased with the increase of the disturbance intensity.Under the severe disturbance,plant species replacement occurred strongly.The obtained results provide some a guideline for the sustainable management of bamboo forest.展开更多
Subalpine dark coniferous forests in the western Sichuan Province of China play an important role in the hydrological processes in the upper reaches of the Yangtze River. Second-growth forests, with different stand su...Subalpine dark coniferous forests in the western Sichuan Province of China play an important role in the hydrological processes in the upper reaches of the Yangtze River. Second-growth forests, with different stand successional stages, have developed as a result of logging over the past 50 years. Forest cover and stand structure changed greatly with concomitant degradation of forest ecosystem functions. To understand how the stand structures of the second-growth forests change during the stand succession process, we analyzed stand structure characteristics and an old-growth state index of the bamboo and moss-forest types. We found that stand structure at the young successional stage featured one-third of the structure characteristics of the old-growth dark coniferous forests,while the structure of the medium-aged stage had reached half the structure of the old-growth state. The two forest types were similar in the rate of development at the young successional stage but differed at the medium-aged stage;the moss-forest type had more advanced development than the bamboo-forest type at the medium-aged successional stage.展开更多
National forest inventory materials and data from China Forest Ecosystem Location Research Network （CFERN） were obtained for estimating four periods of carbon storage of Bamboo forest ecosystem from 1977 to 2003 in ...National forest inventory materials and data from China Forest Ecosystem Location Research Network （CFERN） were obtained for estimating four periods of carbon storage of Bamboo forest ecosystem from 1977 to 2003 in China. The spatial and temporal patterns, vertical distribution and potential carbon storage of the bamboo forest ecosystem were analyzed. The results showed that carbon storage of Chinese bamboo forest ecosystem was 537.6 Mt C during 1977 and 1981, 598.61 Mt C during 1984 and 1988, 710.14 Mt C during 1994 and 1998, and 837.92 Mt C during 1999 and 2003. It showed that the carbon storage was increasing during that time. Zhejiang, Jiangxi, Fujian, Hunan, Guangdong and Sichuan were the major carbon pools in China, with the percentages of carbon storage between 80.04 and 83.13 percent in all. The percentages of carbon storage of vegetation, litter, and soil were between 23.85 and 24.48 percent, between 0.92 and 0.96 percent, and between 74.56 and 75.23 percent respectively. Therefore, it is concluded that the carbon storage in different layers were similar vertically. Carbon storage was 837.92 Mt C from 1999 to 2003, and it will be increased to 947.54 Mt C after one age period with a rate of 54.81Mt carbons stored in ecosystem every year.展开更多
The study looks at the carbon reserves of bamboo forests in China from 2004 to 2018.The temporal and spatial variation characteristics of the carbon reserves of bamboo forests in China were analyzed.It enriches the re...The study looks at the carbon reserves of bamboo forests in China from 2004 to 2018.The temporal and spatial variation characteristics of the carbon reserves of bamboo forests in China were analyzed.It enriches the research field of bamboo forest carbon reserve change at the national level.The bamboo forest carbon reserves of 20 provinces in China were estimated by using the calculation method of bamboo forest biomass and bamboo forest soil organic matter carbon reserves,and the temporal and spatial variation characteristics of bamboo forest carbon reserves in China were analyzed by GIS spatial analysis method.The results are as follows:(1)the carbon reserves of bamboo forests in China during 2004-2008,2009-2013 and 2014-2018 were 707.08 Tg C,802.83 Tg C and 845.05 Tg C respectively,with an average annual growth rate of 1.95%.Fujian,Jiangxi,Zhejiang,Hunan,Sichuan and Guangdong account for 78.01%-78.80% of the total bamboo forest carbon storage in China.(2)From 2004 to 2008,the carbon reserves of bamboo biomass in China were 380.63 Tg C-454.92 Tg C,accounting for 52.64%-52.91% of the total carbon reserves;The carbon storage of soil organic matter is 342.39 Tg C-406.33 Tg C,accounting for 47.01%-47.36% of the total carbon storage.(3)The spatial distribution of bamboo forest carbon reserves in China shows a high-high,low-low correlation trend.The relevant provinces are Zhejiang,Fujian,Guangdong and Jiangxi,which are concentrated in the southern provinces of China.The low-low related provinces are Inner Mongolia,Hebei and Liaoning,which are concentrated in the northern provinces of China.In the future,China’s bamboo forest carbon reserves will increase steadily.Bamboo forest carbon reserves are concentrated in southern provinces.China should further improve the level of spatial agglomeration and give full play to the role of bamboo forest carbon sink.展开更多
The soil nitrogen(N)supply plays a core role in nutrient cycling,whereas phosphorus(P)is generally considered the limiting element of ecological processes in subtropical forests.However,the specific characteristics an...The soil nitrogen(N)supply plays a core role in nutrient cycling,whereas phosphorus(P)is generally considered the limiting element of ecological processes in subtropical forests.However,the specific characteristics and regulatory mechanisms governing how P affects soil N mineralization remain incompletely understood.P fertilizer is often applied in bamboo forests,and we collected bulk soil and two types of rhizosphere soils(soils surrounding stump roots and rhizome roots,respectively)from a bamboo forest and conducted microcosm experiments with P addition(PA)to simulate the application of P fertilizer.The N mineralization and microbial and enzymatic parameters of the rhizosphere and bulk soils presented the same response to PA.PA increased the rate of net N mineralization and ammonification,suggesting that PA is beneficial to the N supply in the soil.PA increased the soil bacterial biomass but decreased the fungi:bacteria ratio.The soil enzyme C:N:P ratio indicated that the microbial community was subjected to P limitation.PA resulted in an increase in the enzyme C:P and N:P ratios and a decrease in the enzyme vector angle,suggesting alleviation of P limitation in the soil microbial community.Hierarchical partitioning and Pearson correlation analyses revealed that enzymatic stoichiometry and the vector angle were key regulators of soil N mineralization.These results indicate that PA can not only increase the concentration of soil P but also enhance the soil N supply in subtropical P-limited forests,primarily through changes in microbial nutrient limitation rather than in microbial biomass or community structure.展开更多
Forests play a leading role in regional and global carbon (C) cycles. Detailed assessment of the temporal and spatial changes in C sinks/sources of China's forests is critical to the estimation of the national C b...Forests play a leading role in regional and global carbon (C) cycles. Detailed assessment of the temporal and spatial changes in C sinks/sources of China's forests is critical to the estimation of the national C budget and can help to constitute sustainable forest management policies for climate change. In this study, we explored the spatio-temporal changes in forest biomass C stocks in China between 1977 and 2008, using six periods of the national forest inventory data. According to the definition of the forest inventory, China's forest was categorized into three groups: forest stand, economic forest, and bamboo forest. We estimated forest biomass C stocks for each inventory period by using continuous biomass expansion factor (BEF) method for forest stands, and the mean biomass density method for economic and bamboo forests. As a result, China's forests have accumulated biomass C (i.e., biomass C sink) of 1896 Tg (1Tg=1012g) during the study period, with 1710, 108 and 78 Tg C in forest stands, and economic and bamboo forests, respectively. Annual forest biomass C sink was 70.2 Tg Ca-1 , offsetting 7.8% of the contemporary fossil CO2 emissions in the country. The results also showed that planted forests have functioned as a persistent C sink, sequestrating 818 Tg C and accounting for 47.8% of total C sink in forest stands, and that the old-, mid- and young-aged forests have sequestrated 930, 391 and 388 Tg C from 1977 to 2008. Our results suggest that China's forests have a big potential as biomass C sink in the future because of its large area of planted forests with young-aged growth and low C density.展开更多
Aims Accurate estimates of bamboo biomass and net primary productivity(NPP)are required to evaluate the carbon sequestration potential of bamboo forests.However,relevant data that are important for climate change miti...Aims Accurate estimates of bamboo biomass and net primary productivity(NPP)are required to evaluate the carbon sequestration potential of bamboo forests.However,relevant data that are important for climate change mitigation,have rarely been collected in regions outside of East Asia and India.Information on seasonal patterns of NPP and its components will enable the quantification of factors that influence the carbon balance in bamboo forests.In this study,we quantified the aboveground biomass(AGB)and aboveground NPP of five major bamboo species in northern Laos using monthly data collected over a 12-month period.Methods All live culms in 10,2 m×2 m plots(for one monopodial bamboo species:Indosasa sinica)and 30 clumps per species(for four sympodial bamboo species:Bambusa tulda,Cephalostachyum virgatum,Dendrocalamus membranaceus and Gigantochloa sp.)were numbered and measured at breast height.We set 10 or 20 litter traps per species to collect litterfall.Censuses of dead and recruited culms and litterfall collection were performed once per month for 12 months.Important Findings The AGB was highest in I.sinica(59.87 Mg ha^(-1))and lowest in C.virgatum(11.54 Mg ha^(-1)),and was mostly below the plausible global range for bamboos(32–256 Mg ha^(-1)).The sympatric distribution of multiple bamboo species at the study sites may have suppressed the AGB in four of the five studied species.The aboveground NPP estimates were between 3.43 and 14.25 Mg ha^(-1) yr^(-1);those for D.membranaceus(8.20 Mg ha^(-1) yr^(-1))and I.sinica(14.25 Mg ha^(-1) yr^(-1))were comparable to mean global estimates for temperate evergreen forests(8.78 Mg ha^(-1) yr^(-1))and tropical moist forests(10.56 Mg ha^(-1) yr^(-1)).High culm recruitment rates(15.20–23.39%yr^(-1))were major contributors to aboveground NPP estimates.Seasonal patterns of aboveground NPP were largely influenced by the phenology of the new culms.In the four sympodial bamboo species,new culms began to emerge following the onset of persistent rainfall,mainly in July and August.However,the sprouting of new culms in the monopodial species I.sinica followed a trend of increasing temperatures,mainly in March and April.Thus,our results indicate that bamboos have considerable potential for sequestering carbon in northern Laos,but that this potential may be affected by climate change.展开更多
Driving up the winding mountain roads of Liangping District in Chongqing Municipality,southwest China,travelers are greeted by slopes covered in dense bamboo forests.The fresh,leafy view hides a painful memory:Just ov...Driving up the winding mountain roads of Liangping District in Chongqing Municipality,southwest China,travelers are greeted by slopes covered in dense bamboo forests.The fresh,leafy view hides a painful memory:Just over a decade ago,these same hills were scarred by unchecked pollution from mining and papermaking.Dust filled the air,streams ran dry and villagers recall nights when even the stars were hidden behind a thick haze.展开更多
基金Financial support for this study was provided by the Science and Technology Program of Guizhou Province(Grant Nos.Qainkehe Zhicheng[2024]yiban120Qainkehe Zhicheng[2023]yiban210)+1 种基金the Project of Central Finance Guides Local Scientific and Technological Development(Grant No.Qiankehe Zhongyindi[2023]028)the Guizhou Normal University Academic New Talent Fund Project(Grant No.Qianshi Xinmiao[2022]21).
文摘To understand the sequestration characteristics and mechanisms of soil PhytOC(phytolith-occluded organic carbon)in large-diameter bamboo forests,the soil PhytOC accumulation of the P.edulis forests and B.emeiensis forests in the karst and non-karst zones of southwest China were studied by the methods of field sampling,laboratory measurement,and statistic analysis.The study yielded the following results and conclusions:1)The PhytOC content and storage in the 0‒30 cm soil profile of the P.edulis forests range from 0.16‒1.85 g kg^(‒1)and 0.14‒1.41 t hm^(‒2),respectively.Similarly,the PhytOC content and storage in the 0‒30 cm soil profile of the B.emeiensis forests vary between 0.56‒2.44 g kg^(‒1)and 0.49‒2.07 t hm^(‒2),respectively.2)Stand age and bedrock type significantly influence the accumulation of soil PhytOC in both P.edulis forests and B.emeiensis forests.The mature forests exhibit the highest soil PhytOC content and storage in both types of bamboo forests.Additionally,the soil PhytOC content in karst bamboo forests is notably higher compared to that in the non-karst area.3)Soil available Si is identified as one of the critical factors affecting the soil PhytOC accumulation in bamboo forests.Results of the present study are of great significance for estimating the phytolith carbon sequestration capacity of bamboo forests and for bamboo forest construction and management aimed at enhancing carbon sequestration.
基金The present work was financially supported by National Key R&D Program(2018YFD0600104)Scientific Program of Zhejiang Province of China(2017C02016).
文摘Plant species diversity is an important index reflecting the functional complexity and stability of ecosystems.Human activity can completely alter plant species diversity and cause serious degradation of ecosystems but its impact on bamboo forest still lacks of systematic evaluation.In this study,we performed a field investigation to reveal the influences of human disturbances on the plant diversity and stability of Moso bamboo forests at Southern China.The selected bamboo fields contained different intensities of human activities that could be classified as slight,moderate and severe disturbance level.Species richness index S,Shannon-Wienner index H,Simpson index D,Pielou index Jsw,community similarity index IS and community stability index were employed to quantitatively evaluate the plant species diversity and stability.The survey revealed that there were 203 species belonging to 83 families and 108 genera in Moso bamboo forests.The number of plant species in the Moso bamboo forests decreased with the increasing of disturbance intensity.The species diversity indexes generally followed the order of slight>moderate>severe disturbance,as well as the richness index S,Shannon-Wienner index H and Pielou index Jsw.The similarity and species stability of the bamboo forest communities also decreased with the increase of the disturbance intensity.Under the severe disturbance,plant species replacement occurred strongly.The obtained results provide some a guideline for the sustainable management of bamboo forest.
基金supported by the grants from the Chinese National Natural Science Foundation(31160156)the Ministry of Science and Technology(2006BAD03A042012BAD22B01)
文摘Subalpine dark coniferous forests in the western Sichuan Province of China play an important role in the hydrological processes in the upper reaches of the Yangtze River. Second-growth forests, with different stand successional stages, have developed as a result of logging over the past 50 years. Forest cover and stand structure changed greatly with concomitant degradation of forest ecosystem functions. To understand how the stand structures of the second-growth forests change during the stand succession process, we analyzed stand structure characteristics and an old-growth state index of the bamboo and moss-forest types. We found that stand structure at the young successional stage featured one-third of the structure characteristics of the old-growth dark coniferous forests,while the structure of the medium-aged stage had reached half the structure of the old-growth state. The two forest types were similar in the rate of development at the young successional stage but differed at the medium-aged stage;the moss-forest type had more advanced development than the bamboo-forest type at the medium-aged successional stage.
文摘National forest inventory materials and data from China Forest Ecosystem Location Research Network （CFERN） were obtained for estimating four periods of carbon storage of Bamboo forest ecosystem from 1977 to 2003 in China. The spatial and temporal patterns, vertical distribution and potential carbon storage of the bamboo forest ecosystem were analyzed. The results showed that carbon storage of Chinese bamboo forest ecosystem was 537.6 Mt C during 1977 and 1981, 598.61 Mt C during 1984 and 1988, 710.14 Mt C during 1994 and 1998, and 837.92 Mt C during 1999 and 2003. It showed that the carbon storage was increasing during that time. Zhejiang, Jiangxi, Fujian, Hunan, Guangdong and Sichuan were the major carbon pools in China, with the percentages of carbon storage between 80.04 and 83.13 percent in all. The percentages of carbon storage of vegetation, litter, and soil were between 23.85 and 24.48 percent, between 0.92 and 0.96 percent, and between 74.56 and 75.23 percent respectively. Therefore, it is concluded that the carbon storage in different layers were similar vertically. Carbon storage was 837.92 Mt C from 1999 to 2003, and it will be increased to 947.54 Mt C after one age period with a rate of 54.81Mt carbons stored in ecosystem every year.
基金supported by the Yunnan Provincial Education Department Scientific Research Fund Project(Grant No.2023Y0803)the National Natural Science Foundation of China(Grant No.72264035)。
文摘The study looks at the carbon reserves of bamboo forests in China from 2004 to 2018.The temporal and spatial variation characteristics of the carbon reserves of bamboo forests in China were analyzed.It enriches the research field of bamboo forest carbon reserve change at the national level.The bamboo forest carbon reserves of 20 provinces in China were estimated by using the calculation method of bamboo forest biomass and bamboo forest soil organic matter carbon reserves,and the temporal and spatial variation characteristics of bamboo forest carbon reserves in China were analyzed by GIS spatial analysis method.The results are as follows:(1)the carbon reserves of bamboo forests in China during 2004-2008,2009-2013 and 2014-2018 were 707.08 Tg C,802.83 Tg C and 845.05 Tg C respectively,with an average annual growth rate of 1.95%.Fujian,Jiangxi,Zhejiang,Hunan,Sichuan and Guangdong account for 78.01%-78.80% of the total bamboo forest carbon storage in China.(2)From 2004 to 2008,the carbon reserves of bamboo biomass in China were 380.63 Tg C-454.92 Tg C,accounting for 52.64%-52.91% of the total carbon reserves;The carbon storage of soil organic matter is 342.39 Tg C-406.33 Tg C,accounting for 47.01%-47.36% of the total carbon storage.(3)The spatial distribution of bamboo forest carbon reserves in China shows a high-high,low-low correlation trend.The relevant provinces are Zhejiang,Fujian,Guangdong and Jiangxi,which are concentrated in the southern provinces of China.The low-low related provinces are Inner Mongolia,Hebei and Liaoning,which are concentrated in the northern provinces of China.In the future,China’s bamboo forest carbon reserves will increase steadily.Bamboo forest carbon reserves are concentrated in southern provinces.China should further improve the level of spatial agglomeration and give full play to the role of bamboo forest carbon sink.
基金the National Natural Science Foundation of China(Grant No.32260379,32371852)the Jiangxi Provincial Natural Science Foundation(Grant No.20242BAB26101)the Jiangxi Provincial Postgraduate Innovation Special Fund Project(Grant No.YC2023-S352).
文摘The soil nitrogen(N)supply plays a core role in nutrient cycling,whereas phosphorus(P)is generally considered the limiting element of ecological processes in subtropical forests.However,the specific characteristics and regulatory mechanisms governing how P affects soil N mineralization remain incompletely understood.P fertilizer is often applied in bamboo forests,and we collected bulk soil and two types of rhizosphere soils(soils surrounding stump roots and rhizome roots,respectively)from a bamboo forest and conducted microcosm experiments with P addition(PA)to simulate the application of P fertilizer.The N mineralization and microbial and enzymatic parameters of the rhizosphere and bulk soils presented the same response to PA.PA increased the rate of net N mineralization and ammonification,suggesting that PA is beneficial to the N supply in the soil.PA increased the soil bacterial biomass but decreased the fungi:bacteria ratio.The soil enzyme C:N:P ratio indicated that the microbial community was subjected to P limitation.PA resulted in an increase in the enzyme C:P and N:P ratios and a decrease in the enzyme vector angle,suggesting alleviation of P limitation in the soil microbial community.Hierarchical partitioning and Pearson correlation analyses revealed that enzymatic stoichiometry and the vector angle were key regulators of soil N mineralization.These results indicate that PA can not only increase the concentration of soil P but also enhance the soil N supply in subtropical P-limited forests,primarily through changes in microbial nutrient limitation rather than in microbial biomass or community structure.
基金supported by the National Basic Research Program of China on Global Change (2010CB950600)the National Natural Science Foundation of China (31021001, 30721140306)'Strategic Priority Research Program-Climate Change: Carbon Budget and Related Issues' of the Chinese Academy of Sciences (XDA05050503)
文摘Forests play a leading role in regional and global carbon (C) cycles. Detailed assessment of the temporal and spatial changes in C sinks/sources of China's forests is critical to the estimation of the national C budget and can help to constitute sustainable forest management policies for climate change. In this study, we explored the spatio-temporal changes in forest biomass C stocks in China between 1977 and 2008, using six periods of the national forest inventory data. According to the definition of the forest inventory, China's forest was categorized into three groups: forest stand, economic forest, and bamboo forest. We estimated forest biomass C stocks for each inventory period by using continuous biomass expansion factor (BEF) method for forest stands, and the mean biomass density method for economic and bamboo forests. As a result, China's forests have accumulated biomass C (i.e., biomass C sink) of 1896 Tg (1Tg=1012g) during the study period, with 1710, 108 and 78 Tg C in forest stands, and economic and bamboo forests, respectively. Annual forest biomass C sink was 70.2 Tg Ca-1 , offsetting 7.8% of the contemporary fossil CO2 emissions in the country. The results also showed that planted forests have functioned as a persistent C sink, sequestrating 818 Tg C and accounting for 47.8% of total C sink in forest stands, and that the old-, mid- and young-aged forests have sequestrated 930, 391 and 388 Tg C from 1977 to 2008. Our results suggest that China's forests have a big potential as biomass C sink in the future because of its large area of planted forests with young-aged growth and low C density.
基金supported by the Transnational Doctoral Programs for Leading Professionals,Nagoya University Asian Satellite Campuses Institute(2017-2019).No funding was obtained for this systematic review.
文摘Aims Accurate estimates of bamboo biomass and net primary productivity(NPP)are required to evaluate the carbon sequestration potential of bamboo forests.However,relevant data that are important for climate change mitigation,have rarely been collected in regions outside of East Asia and India.Information on seasonal patterns of NPP and its components will enable the quantification of factors that influence the carbon balance in bamboo forests.In this study,we quantified the aboveground biomass(AGB)and aboveground NPP of five major bamboo species in northern Laos using monthly data collected over a 12-month period.Methods All live culms in 10,2 m×2 m plots(for one monopodial bamboo species:Indosasa sinica)and 30 clumps per species(for four sympodial bamboo species:Bambusa tulda,Cephalostachyum virgatum,Dendrocalamus membranaceus and Gigantochloa sp.)were numbered and measured at breast height.We set 10 or 20 litter traps per species to collect litterfall.Censuses of dead and recruited culms and litterfall collection were performed once per month for 12 months.Important Findings The AGB was highest in I.sinica(59.87 Mg ha^(-1))and lowest in C.virgatum(11.54 Mg ha^(-1)),and was mostly below the plausible global range for bamboos(32–256 Mg ha^(-1)).The sympatric distribution of multiple bamboo species at the study sites may have suppressed the AGB in four of the five studied species.The aboveground NPP estimates were between 3.43 and 14.25 Mg ha^(-1) yr^(-1);those for D.membranaceus(8.20 Mg ha^(-1) yr^(-1))and I.sinica(14.25 Mg ha^(-1) yr^(-1))were comparable to mean global estimates for temperate evergreen forests(8.78 Mg ha^(-1) yr^(-1))and tropical moist forests(10.56 Mg ha^(-1) yr^(-1)).High culm recruitment rates(15.20–23.39%yr^(-1))were major contributors to aboveground NPP estimates.Seasonal patterns of aboveground NPP were largely influenced by the phenology of the new culms.In the four sympodial bamboo species,new culms began to emerge following the onset of persistent rainfall,mainly in July and August.However,the sprouting of new culms in the monopodial species I.sinica followed a trend of increasing temperatures,mainly in March and April.Thus,our results indicate that bamboos have considerable potential for sequestering carbon in northern Laos,but that this potential may be affected by climate change.
文摘Driving up the winding mountain roads of Liangping District in Chongqing Municipality,southwest China,travelers are greeted by slopes covered in dense bamboo forests.The fresh,leafy view hides a painful memory:Just over a decade ago,these same hills were scarred by unchecked pollution from mining and papermaking.Dust filled the air,streams ran dry and villagers recall nights when even the stars were hidden behind a thick haze.
