Forest ecosystems are increasingly susceptible to droughts and nitrogen(N)deposition.However,the effects of N addition on the growth of bamboo under drought stress remain unclear.This study conducted a comprehensive f...Forest ecosystems are increasingly susceptible to droughts and nitrogen(N)deposition.However,the effects of N addition on the growth of bamboo under drought stress remain unclear.This study conducted a comprehensive factorial experiment to investigate the combined effects of drought and N addition on the growth of Moso bamboo(Phyllostachys edulis)seedlings.Six treatment combinations were established:0 mg·kg^(-1) N with 80%–85%field capacity(FC)soil moisture,0 mg·kg^(-1) N with 50%–55%FC,0 mg·kg^(-1) N with 30%–35%FC,100 mg·kg^(-1) N with 80%–85%FC,100 mg·kg^(-1) N with 50%–55%FC,and 100 mg·kg^(-1) N with 30%–35%FC.The results revealed that drought altered the soil microbial community structure and significantly reduced the biomass of Moso bamboo seedlings.Notably,N addition mitigated the adverse effects of drought on bamboo growth in general.Specifically,N addition alleviated the negative effects of drought on root biomass but aggravated them on leaf biomass of Moso bamboo seedlings,and with the intensification of drought stress,this effect was weakened.Furthermore,sucrose and urease exerted dominant and direct influences on the total biomass.The results underscore the pivotal role of N in facilitating plant drought tolerance,suggesting that the interplay between drought and N addition in plant growth should be considered in the context of changing environmental conditions,and offering novel perspectives on sustainable management strategies for bamboo forests.展开更多
Climate change disrupts the distribution of species and restructures their richness patterns.The genus of Asian bamboo,Phyllostachys,possesses significant ecological and economic values,and represents the most species...Climate change disrupts the distribution of species and restructures their richness patterns.The genus of Asian bamboo,Phyllostachys,possesses significant ecological and economic values,and represents the most speciesrich genus in the Bambusoideae subfamily.Based on the distribution data of 46 species and 20 environmental variables,we used the MaxEnt model combined with ArcGIS calculations to simulate current and future potential richness distributions under three distinct CO_(2) emission scenarios.The results showed that the MaxEnt model had a good predictive ability,with a mean area under the working characteristic curve(AUC value)of 0.91 for all species.The main environmental variables that impacted the future distribution of most Phyllostachys species were elevation,variations of seasonal precipitation,and mean diurnal range.Phyllostachys species are currently concentrated in southeastern China.Under future climate projections,18 species exhibited significant habitat contraction across three or more future climate scenarios,but suitable habitats for other species will expand.This enhancement is most pronounced under the extreme climate scenario(2090s-SSP585),primarily driven by high species gains contributing to elevated turnover values across scenarios.The center of maximum richness will progressively shift southwestward over time.Predictive modeling of Phyllostachys richness distribution dynamics under climate change enhances our understanding of its biogeography and informs strategic introduction programs to bamboo management and augments China’s carbon sequestration capacity.展开更多
针对SCOPE(soil canopy observation of photosynthesis and energy fluxes)模型模拟冠层净辐射(0.4~2.5μm短波净辐射+2.5~50μm长波净辐射)时假设叶片空间随机分布的问题,开发考虑叶片空间聚集的冠层净辐射模拟新模型。将SCOPE模型的...针对SCOPE(soil canopy observation of photosynthesis and energy fluxes)模型模拟冠层净辐射(0.4~2.5μm短波净辐射+2.5~50μm长波净辐射)时假设叶片空间随机分布的问题,开发考虑叶片空间聚集的冠层净辐射模拟新模型。将SCOPE模型的短波净辐射模块和长波净辐射模块分别用考虑叶片空间聚集的GOST2模型和UFR97模型替换,形成新的冠层净辐射模拟模型NRC(modeling canopy net radiation considering spatial clumping index of leaves);通过浙江省安吉县1个毛竹(Phyllostachys edulis)林样地(1~4年生异龄林,4500株/hm^(2))2023年整年的观测数据验证,对比SCOPE模型和NRC模型对冠层净辐射的模拟结果。SCOPE模型和NRC模型对冠层净辐射的模拟结果都与观测值有强相关性,决定系数(R^(2))分别为0.97和0.99,均方根误差(RMSE)分别为47.24和13.31 W/m^(2)。SCOPE模型模拟得到的短波净辐射(R_(notot))存在低估(R^(2)=0.96,平均偏差MBE=-14.17 W/m^(2)),长波净辐射(R nttot)存在高估(R^(2)=0.46;MBE=50.27 W/m^(2)),而NRC模型分别成功模拟了R_(notot)(R^(2)=0.99,MBE=1.44 W/m^(2))和R nttot(R^(2)=0.71;MBE=1.34 W/m^(2))。NRC模型具备模拟叶片空间聚集条件下冠层净辐射的潜力。展开更多
为揭示毛竹林在低磷胁迫下维持高生产力的根系磷获取策略,本研究通过原位磷添加试验(对照0 kg P·hm^(-2)·a^(-1)、低磷50 kg P·hm^(-2)·a^(-1)和高磷100 kg P·hm^(-2)·a^(-1)),分析磷添加对毛竹鞭根形态...为揭示毛竹林在低磷胁迫下维持高生产力的根系磷获取策略,本研究通过原位磷添加试验(对照0 kg P·hm^(-2)·a^(-1)、低磷50 kg P·hm^(-2)·a^(-1)和高磷100 kg P·hm^(-2)·a^(-1)),分析磷添加对毛竹鞭根形态和生理特征、根系分泌物和菌根性状的调控机制。结果表明:与对照相比,磷添加显著增加了比表面积(低磷:19.1%;高磷:23.4%)、根系氮(低磷:42.6%;高磷:37.7%)和磷含量(低磷:83.8%;高磷:115.3%),但显著抑制了磷酸酶活性(低磷:22.2%;高磷:30.4%)和丛枝菌根真菌(AMF)侵染率(低磷:24.1%;高磷:25.3%);低磷与高磷处理间无显著差异。磷添加处理显著提升根际土壤pH值、柠檬酸磷、酶解磷、盐酸磷及微生物生物量碳、氮、磷。其中,高磷处理柠檬酸磷、酶解磷和盐酸磷含量显著高于低磷处理。根际土壤磷组分与根系比表面积、磷酸酶活性及AMF侵染率呈显著相关,表明根际土壤磷组分是驱动鞭根磷获取途径转变的重要因子。磷添加处理下毛竹鞭根由“分泌物-菌根共生”资源保守型途径向“高表面积”的资源获取型途径转变。展开更多
【目的】探究杉木与方竹混交对人工林生态系统结构的长期调控机制。【方法】以乌蒙山区14年生杉木纯林(CK)、杉木方竹混交林(MC)和方竹纯林(FC)为研究对象,设置9块重复样地(杉木纯林、杉木-方竹混交林、方竹纯林各3块),对比分析混交对...【目的】探究杉木与方竹混交对人工林生态系统结构的长期调控机制。【方法】以乌蒙山区14年生杉木纯林(CK)、杉木方竹混交林(MC)和方竹纯林(FC)为研究对象,设置9块重复样地(杉木纯林、杉木-方竹混交林、方竹纯林各3块),对比分析混交对杉木生长、林分结构及生态效益的影响。【结果】与杉木纯林相比,杉木-方竹混交林显著促进杉木生长。混交林杉木平均树高高出纯林10.3%(12.497 m vs 11.330 m),混交林中杉木平均胸径(13.880 cm)略优于(+0.9%)杉木纯林中杉木平均胸径(13.757 cm)。混交优化了林分空间结构。杉木-方竹混交林平均角尺度(0.3624)<杉木纯林(0.4837)<方竹纯林(0.6231)。杉木纯林大小比数平均值(0.3721)<杉木-方竹混交林(0.4945)<方竹纯林(0.5214)。杉木-方竹混交林混交度平均值(0.3673)>杉木纯林(0.2836)>方竹纯林(0.1821)。混交提高了林分生态效益功能。杉木-方竹混交林物种丰富度(植物种数28.6±4.5,Shannon指数3.0±0.5)>杉木纯林(植物种数16.3±2.6,Shannon指数2.2±0.6)>方竹纯林(植物种数15.4±4.7,Shannon指数1.9±0.7)。展开更多
毛竹林主要分布在缺磷的亚热带地区,具有天然的立竹年龄结构及独特的篼根和鞭根“双根系统”,挖掘根际解磷菌种资源并探明其对磷添加的响应,是提升毛竹生产力和生态功能的关键。本研究采用微孔板高通量筛选方法,分离3个磷添加水平(对照,...毛竹林主要分布在缺磷的亚热带地区,具有天然的立竹年龄结构及独特的篼根和鞭根“双根系统”,挖掘根际解磷菌种资源并探明其对磷添加的响应,是提升毛竹生产力和生态功能的关键。本研究采用微孔板高通量筛选方法,分离3个磷添加水平(对照,CK,0 kg P·hm^(-2)·a^(-1);低磷,LP,50 kg P·hm^(-2)·a^(-1);高磷,HP,100 kg P·hm^(-2)·a^(-1))样地的毛竹篼根(1龄和3龄)及相连鞭根根际解磷细菌,探究解磷菌数量与活性对磷添加的响应及其影响因素。毛竹根际共分离出125株解磷菌,其中96.8%为变形菌门,主要包括布鲁氏菌属和伯克霍尔德氏菌属。3龄竹篼根的解磷菌最多(52株),解磷活性为171.24 mg·L^(-1),分别是1龄竹篼根和鞭根解磷菌解磷活性的1.5和1.4倍。与对照样地相比,LP样地1龄竹篼根解磷菌的数量和活性均降低,HP样地解磷菌的数量保持不变但活性增加;LP样地3龄竹篼根和鞭根的根际解磷菌的数量降低但解磷活性增加,HP样地解磷菌的数量和活性均增加。细菌的解磷活性与土壤总磷、pH和微生物生物量磷呈显著正相关。综上,3龄毛竹篼根解磷菌的数量和活性均高于1龄竹篼根和鞭根,并对磷添加有积极响应。建议在毛竹林集约化管理中优先施磷肥于3龄竹篼根,以更大限度地激活土壤微生物的解磷潜力。展开更多
基金supported by the National Key Research and Development Program of China(No.2021YFD2200402)the Leading Goose Project from Zhejiang Department of Science and Technology(No.2023C02035)+1 种基金the Central Non-profit Research Institution(CAFYBB2025ZC006)the Fundamental Research Funds for the National Natural Science Foundation of China(No.32071756 and U24A20429)。
文摘Forest ecosystems are increasingly susceptible to droughts and nitrogen(N)deposition.However,the effects of N addition on the growth of bamboo under drought stress remain unclear.This study conducted a comprehensive factorial experiment to investigate the combined effects of drought and N addition on the growth of Moso bamboo(Phyllostachys edulis)seedlings.Six treatment combinations were established:0 mg·kg^(-1) N with 80%–85%field capacity(FC)soil moisture,0 mg·kg^(-1) N with 50%–55%FC,0 mg·kg^(-1) N with 30%–35%FC,100 mg·kg^(-1) N with 80%–85%FC,100 mg·kg^(-1) N with 50%–55%FC,and 100 mg·kg^(-1) N with 30%–35%FC.The results revealed that drought altered the soil microbial community structure and significantly reduced the biomass of Moso bamboo seedlings.Notably,N addition mitigated the adverse effects of drought on bamboo growth in general.Specifically,N addition alleviated the negative effects of drought on root biomass but aggravated them on leaf biomass of Moso bamboo seedlings,and with the intensification of drought stress,this effect was weakened.Furthermore,sucrose and urease exerted dominant and direct influences on the total biomass.The results underscore the pivotal role of N in facilitating plant drought tolerance,suggesting that the interplay between drought and N addition in plant growth should be considered in the context of changing environmental conditions,and offering novel perspectives on sustainable management strategies for bamboo forests.
基金supported by the National Science Foundation of China(32201643)the Key Research Projects of Yibin,research and integrated demonstration and key technologies for smart bamboo industry(YBZD2024-1).
文摘Climate change disrupts the distribution of species and restructures their richness patterns.The genus of Asian bamboo,Phyllostachys,possesses significant ecological and economic values,and represents the most speciesrich genus in the Bambusoideae subfamily.Based on the distribution data of 46 species and 20 environmental variables,we used the MaxEnt model combined with ArcGIS calculations to simulate current and future potential richness distributions under three distinct CO_(2) emission scenarios.The results showed that the MaxEnt model had a good predictive ability,with a mean area under the working characteristic curve(AUC value)of 0.91 for all species.The main environmental variables that impacted the future distribution of most Phyllostachys species were elevation,variations of seasonal precipitation,and mean diurnal range.Phyllostachys species are currently concentrated in southeastern China.Under future climate projections,18 species exhibited significant habitat contraction across three or more future climate scenarios,but suitable habitats for other species will expand.This enhancement is most pronounced under the extreme climate scenario(2090s-SSP585),primarily driven by high species gains contributing to elevated turnover values across scenarios.The center of maximum richness will progressively shift southwestward over time.Predictive modeling of Phyllostachys richness distribution dynamics under climate change enhances our understanding of its biogeography and informs strategic introduction programs to bamboo management and augments China’s carbon sequestration capacity.
文摘针对SCOPE(soil canopy observation of photosynthesis and energy fluxes)模型模拟冠层净辐射(0.4~2.5μm短波净辐射+2.5~50μm长波净辐射)时假设叶片空间随机分布的问题,开发考虑叶片空间聚集的冠层净辐射模拟新模型。将SCOPE模型的短波净辐射模块和长波净辐射模块分别用考虑叶片空间聚集的GOST2模型和UFR97模型替换,形成新的冠层净辐射模拟模型NRC(modeling canopy net radiation considering spatial clumping index of leaves);通过浙江省安吉县1个毛竹(Phyllostachys edulis)林样地(1~4年生异龄林,4500株/hm^(2))2023年整年的观测数据验证,对比SCOPE模型和NRC模型对冠层净辐射的模拟结果。SCOPE模型和NRC模型对冠层净辐射的模拟结果都与观测值有强相关性,决定系数(R^(2))分别为0.97和0.99,均方根误差(RMSE)分别为47.24和13.31 W/m^(2)。SCOPE模型模拟得到的短波净辐射(R_(notot))存在低估(R^(2)=0.96,平均偏差MBE=-14.17 W/m^(2)),长波净辐射(R nttot)存在高估(R^(2)=0.46;MBE=50.27 W/m^(2)),而NRC模型分别成功模拟了R_(notot)(R^(2)=0.99,MBE=1.44 W/m^(2))和R nttot(R^(2)=0.71;MBE=1.34 W/m^(2))。NRC模型具备模拟叶片空间聚集条件下冠层净辐射的潜力。
文摘为揭示毛竹林在低磷胁迫下维持高生产力的根系磷获取策略,本研究通过原位磷添加试验(对照0 kg P·hm^(-2)·a^(-1)、低磷50 kg P·hm^(-2)·a^(-1)和高磷100 kg P·hm^(-2)·a^(-1)),分析磷添加对毛竹鞭根形态和生理特征、根系分泌物和菌根性状的调控机制。结果表明:与对照相比,磷添加显著增加了比表面积(低磷:19.1%;高磷:23.4%)、根系氮(低磷:42.6%;高磷:37.7%)和磷含量(低磷:83.8%;高磷:115.3%),但显著抑制了磷酸酶活性(低磷:22.2%;高磷:30.4%)和丛枝菌根真菌(AMF)侵染率(低磷:24.1%;高磷:25.3%);低磷与高磷处理间无显著差异。磷添加处理显著提升根际土壤pH值、柠檬酸磷、酶解磷、盐酸磷及微生物生物量碳、氮、磷。其中,高磷处理柠檬酸磷、酶解磷和盐酸磷含量显著高于低磷处理。根际土壤磷组分与根系比表面积、磷酸酶活性及AMF侵染率呈显著相关,表明根际土壤磷组分是驱动鞭根磷获取途径转变的重要因子。磷添加处理下毛竹鞭根由“分泌物-菌根共生”资源保守型途径向“高表面积”的资源获取型途径转变。
文摘【目的】探究杉木与方竹混交对人工林生态系统结构的长期调控机制。【方法】以乌蒙山区14年生杉木纯林(CK)、杉木方竹混交林(MC)和方竹纯林(FC)为研究对象,设置9块重复样地(杉木纯林、杉木-方竹混交林、方竹纯林各3块),对比分析混交对杉木生长、林分结构及生态效益的影响。【结果】与杉木纯林相比,杉木-方竹混交林显著促进杉木生长。混交林杉木平均树高高出纯林10.3%(12.497 m vs 11.330 m),混交林中杉木平均胸径(13.880 cm)略优于(+0.9%)杉木纯林中杉木平均胸径(13.757 cm)。混交优化了林分空间结构。杉木-方竹混交林平均角尺度(0.3624)<杉木纯林(0.4837)<方竹纯林(0.6231)。杉木纯林大小比数平均值(0.3721)<杉木-方竹混交林(0.4945)<方竹纯林(0.5214)。杉木-方竹混交林混交度平均值(0.3673)>杉木纯林(0.2836)>方竹纯林(0.1821)。混交提高了林分生态效益功能。杉木-方竹混交林物种丰富度(植物种数28.6±4.5,Shannon指数3.0±0.5)>杉木纯林(植物种数16.3±2.6,Shannon指数2.2±0.6)>方竹纯林(植物种数15.4±4.7,Shannon指数1.9±0.7)。
文摘毛竹林主要分布在缺磷的亚热带地区,具有天然的立竹年龄结构及独特的篼根和鞭根“双根系统”,挖掘根际解磷菌种资源并探明其对磷添加的响应,是提升毛竹生产力和生态功能的关键。本研究采用微孔板高通量筛选方法,分离3个磷添加水平(对照,CK,0 kg P·hm^(-2)·a^(-1);低磷,LP,50 kg P·hm^(-2)·a^(-1);高磷,HP,100 kg P·hm^(-2)·a^(-1))样地的毛竹篼根(1龄和3龄)及相连鞭根根际解磷细菌,探究解磷菌数量与活性对磷添加的响应及其影响因素。毛竹根际共分离出125株解磷菌,其中96.8%为变形菌门,主要包括布鲁氏菌属和伯克霍尔德氏菌属。3龄竹篼根的解磷菌最多(52株),解磷活性为171.24 mg·L^(-1),分别是1龄竹篼根和鞭根解磷菌解磷活性的1.5和1.4倍。与对照样地相比,LP样地1龄竹篼根解磷菌的数量和活性均降低,HP样地解磷菌的数量保持不变但活性增加;LP样地3龄竹篼根和鞭根的根际解磷菌的数量降低但解磷活性增加,HP样地解磷菌的数量和活性均增加。细菌的解磷活性与土壤总磷、pH和微生物生物量磷呈显著正相关。综上,3龄毛竹篼根解磷菌的数量和活性均高于1龄竹篼根和鞭根,并对磷添加有积极响应。建议在毛竹林集约化管理中优先施磷肥于3龄竹篼根,以更大限度地激活土壤微生物的解磷潜力。
