草业学报2017，Vol.26Issue(5)：1-14,14.DOI:10.11686/cyxb2016420
气候变化与人为活动对三江源草地 生产力影响的定量研究
Quantitative assessment of relative roles of climate change and human activities on grassland net primary productivity in the Three-River Source Region,China
摘要
Abstract
The Three-River Source Region (TRSR),a region with key importance for the ecological security of China,has been affected by climate change and by changes in human activities driven by a series of ecological restoration projects in recent decades.In this study,we analyzed land use and cover change (LUCC)in the TRSR and the consequent changes in grassland net primary productivity (NPP).For this analysis,we used the CASA (Carnegie-Ames-Stanford Approach)model,a climatic production model,and land use data for the study area from 2001 and 2012,which were derived from the MODIS global land cover product.The contribu-tions of LUCC,land management measures,and climate change to NPP variations were analyzed quantitative-ly.The results showed that,during the 12 years,the net increase in grassland area was 6749 km2 ,and the av-erage NPP and total NPP of grassland decreased by 5 .47% and 5 .00%,respectively.New grassland contribu-ted 1293.12 Gg C (Gg= 109 g)to total NPP,while the loss of grassland led to a decrease of 215.42 Gg C.The climatic total NPP of grasslands decreased by 20.27% and the anthropogenic total NPP increased by 41.51%. These results indicate that climate conditions have negatively affected vegetation growth,whereas human activities have favorably affected vegetation recovery.The contributions of climate change,LUCC,and improved management measures to the variation in total NPP were -165.28 Tg C,2.22 Tg C,and 140.03 Tg C,respectively.Therefore, improving grassland management measures can significantly reduce grassland deterioration due to climate change.关键词
净初级生产力/土地利用/覆盖变化/草地管理措施/人类活动/气候变化/三江源Key words
net primary productivity (NPP)/land use and cover change/grassland management measures/hu-man activities/climate change/Three-River Source Region引用本文复制引用
张颖,章超斌,王钊齐,杨悦,张艳珍,李建龙,安如..气候变化与人为活动对三江源草地 生产力影响的定量研究[J].草业学报,2017,26(5):1-14,14.基金项目
江苏省农业三新工程项目(SXGC[2014]287),国际APN全球变化项目(No.ARCP2015-03CMY-Li & CAF2015-RR14-NMY-Odeh),国家自然科学基金(41271361)和国家863 计划(2007AA10Z231)资助. （SXGC[2014]287）
