新疆地处干旱和半干旱气候区,明确其生态系统的碳汇大小及其对气候变化的响应对研究中国干旱区植被碳汇及其对陆地碳平衡的贡献具有重要意义。基于最新地面气象观测数据,利用大气植被相互作用模型AVIM2(Atmosphere-Vegetation Interacti...新疆地处干旱和半干旱气候区,明确其生态系统的碳汇大小及其对气候变化的响应对研究中国干旱区植被碳汇及其对陆地碳平衡的贡献具有重要意义。基于最新地面气象观测数据,利用大气植被相互作用模型AVIM2(Atmosphere-Vegetation Interaction Model 2),在0.05°×0.05°经纬度空间网格上估算分析了1961-2015年新疆净生态系统生产力(NEP)的时空分布特征及其对气候变化的响应。研究结果表明:近55 a新疆NEP平均值为14.4 g C·m-2,没有明显变化趋势。空间上看,约40%地区的NEP呈下降趋势,主要分布在天山两麓的城市人口聚集区;而60%地区NEP呈上升走势,其主要分布在新疆昆仑山脉、天山山区和人烟稀少的荒漠地区。新疆NEP对降水量变化更为敏感,气温的变化对NEP的影响并不显著。虽然新疆平均碳汇随着年降水量的变化而在源与汇之间波动,但是从多年平均来看,新疆仍然为碳汇区。展开更多
利用大气植被相互作用模型AVIM2(Atmosphere-Vegetation Interaction Model 2)估算分析了时间长度为50年、空间分辨率为0.02°×0.02°的贵州净生态系统生产力(NEP),分析了其对气候变化的响应。结果表明,(1)AVIM2模型能够...利用大气植被相互作用模型AVIM2(Atmosphere-Vegetation Interaction Model 2)估算分析了时间长度为50年、空间分辨率为0.02°×0.02°的贵州净生态系统生产力(NEP),分析了其对气候变化的响应。结果表明,(1)AVIM2模型能够模拟出贵州森林净初级生产力(NPP)的变化,模拟偏差随着树龄的增大而不断减小,其模拟效果优于综合模型。(2)1961—2010年,贵州NEP(以C计)平均值为23.9 g·m-2·a-1,碳源区面积比例仅为5%,且植被覆盖类型为南部部分常绿阔叶林。NEP总量的变动范围为-7.0～11.5 Tg·a-1,平均每年吸收碳4.87Tg,碳汇量占中国区域的3～7%。(3)贵州境内31%的区域固碳能力下降明显(P<0.05)且主要集中在植被类型为常绿针叶林及农作物的北部地区,还有7%的区域固碳能力升高明显(P<0.05)且位于南部部分常绿阔叶林地区。(4)贵州NEP与气温显著负相关(P<0.01),与降水量显著正相关(P<0.05),气温对NEP的影响大于降水。展开更多
Forest vegetation carbon patterns are significant for evaluating carbon emission and accumulation. Many methods were used to simulate patterns of forest vegetation carbon stock in previous studies, however, uncertaint...Forest vegetation carbon patterns are significant for evaluating carbon emission and accumulation. Many methods were used to simulate patterns of forest vegetation carbon stock in previous studies, however, uncertainty apparently existed between results of different methods, even estimates of same method in different studies. Three previous methods, in- cluding Atmosphere-vegetation interaction model 2 （AVIM2）, Kriging, Satellite-data Based Approach （SBA）, and a new method, High Accuracy Surface Modeling （HASM）, were used to simulate forest vegetation carbon stock patterns in Jiangxi Province in China. Cross-valida- tion was used to evaluate methods. The uncertainty and applicability of the four methods on provincial scale were analyzed and discussed. The results showed that HASM had the high- est accuracy, which improved by 50.66%, 33.37% and 28.58%, compared with AVIM2, Kriging and SBA, respectively. Uncertainty of simulation of forest biomass carbon stock was mainly derived from modeling error, sampling error and statistical error of forest area. Total forest carbon stock, carbon density and forest area of Jiangxi were 288.62 Tg, 3.06 kg/m2 and 94.32×109 m2 simulated by HASM, respectively.展开更多
The projected changes in carbon exchange between China terrestrial ecosystem and the atmosphere and vegetation and soil carbon storage during the 21st century were investigated using an atmos-phere-vegetation interact...The projected changes in carbon exchange between China terrestrial ecosystem and the atmosphere and vegetation and soil carbon storage during the 21st century were investigated using an atmos-phere-vegetation interaction model (AVIM2). The results show that in the coming 100 a, for SRES B2 scenario and constant atmospheric CO2 concentration, the net primary productivity (NPP) of terrestrial ecosystem in China will be decreased slowly, and vegetation and soil carbon storage as well as net ecosystem productivity (NEP) will also be decreased. The carbon sink for China terrestrial ecosystem in the beginning of the 20th century will become totally a carbon source by the year of 2020, while for B2 scenario and changing atmospheric CO2 concentration, NPP for China will increase continuously from 2.94 GtC·a?1 by the end of the 20th century to 3.99 GtC·a?1 by the end of the 21st century, and vegetation and soil carbon storage will increase to 110.3 GtC. NEP in China will keep rising during the first and middle periods of the 21st century, and reach the peak around 2050s, then will decrease gradually and approach to zero by the end of the 21st century.展开更多
文摘新疆地处干旱和半干旱气候区,明确其生态系统的碳汇大小及其对气候变化的响应对研究中国干旱区植被碳汇及其对陆地碳平衡的贡献具有重要意义。基于最新地面气象观测数据,利用大气植被相互作用模型AVIM2(Atmosphere-Vegetation Interaction Model 2),在0.05°×0.05°经纬度空间网格上估算分析了1961-2015年新疆净生态系统生产力(NEP)的时空分布特征及其对气候变化的响应。研究结果表明:近55 a新疆NEP平均值为14.4 g C·m-2,没有明显变化趋势。空间上看,约40%地区的NEP呈下降趋势,主要分布在天山两麓的城市人口聚集区;而60%地区NEP呈上升走势,其主要分布在新疆昆仑山脉、天山山区和人烟稀少的荒漠地区。新疆NEP对降水量变化更为敏感,气温的变化对NEP的影响并不显著。虽然新疆平均碳汇随着年降水量的变化而在源与汇之间波动,但是从多年平均来看,新疆仍然为碳汇区。
基金National Fundamental R&D Program of the Ministry of Science and Technology of the People’s Republic of China,No.2013FY111600-4
文摘Forest vegetation carbon patterns are significant for evaluating carbon emission and accumulation. Many methods were used to simulate patterns of forest vegetation carbon stock in previous studies, however, uncertainty apparently existed between results of different methods, even estimates of same method in different studies. Three previous methods, in- cluding Atmosphere-vegetation interaction model 2 （AVIM2）, Kriging, Satellite-data Based Approach （SBA）, and a new method, High Accuracy Surface Modeling （HASM）, were used to simulate forest vegetation carbon stock patterns in Jiangxi Province in China. Cross-valida- tion was used to evaluate methods. The uncertainty and applicability of the four methods on provincial scale were analyzed and discussed. The results showed that HASM had the high- est accuracy, which improved by 50.66%, 33.37% and 28.58%, compared with AVIM2, Kriging and SBA, respectively. Uncertainty of simulation of forest biomass carbon stock was mainly derived from modeling error, sampling error and statistical error of forest area. Total forest carbon stock, carbon density and forest area of Jiangxi were 288.62 Tg, 3.06 kg/m2 and 94.32×109 m2 simulated by HASM, respectively.
基金the Basic Research Program of China (Grant No. 2002CB412500)the National Natural Science Foundation of China (Grant No. 30590384)
文摘The projected changes in carbon exchange between China terrestrial ecosystem and the atmosphere and vegetation and soil carbon storage during the 21st century were investigated using an atmos-phere-vegetation interaction model (AVIM2). The results show that in the coming 100 a, for SRES B2 scenario and constant atmospheric CO2 concentration, the net primary productivity (NPP) of terrestrial ecosystem in China will be decreased slowly, and vegetation and soil carbon storage as well as net ecosystem productivity (NEP) will also be decreased. The carbon sink for China terrestrial ecosystem in the beginning of the 20th century will become totally a carbon source by the year of 2020, while for B2 scenario and changing atmospheric CO2 concentration, NPP for China will increase continuously from 2.94 GtC·a?1 by the end of the 20th century to 3.99 GtC·a?1 by the end of the 21st century, and vegetation and soil carbon storage will increase to 110.3 GtC. NEP in China will keep rising during the first and middle periods of the 21st century, and reach the peak around 2050s, then will decrease gradually and approach to zero by the end of the 21st century.
