草业学报2016，Vol.25Issue(11)：1-14,14.DOI:10.11686/cyxb2016148
近百年全球草地生态系统净初级生产力时空动态对气候变化的响应
The NPP spatiotemporal variation of global grassland ecosystems in response to climate change over the past 100 years
摘要
Abstract
Climate change has a significant effect on the spatial distribution,structure and function of ecosys-tems.To understand the effects and feedback mechanisms of climate change on a large spatial and temporal scale,the distribution,shift ranges and net primary production (NPP)of grassland ecosystems across the globe from 1911 to 2010 have been simulated using the Comprehensive Sequential Classification System (CSCS) and a segmentation model.Correlation analysis was also conducted to reveal the responses of grassland types to different climate variables.The results showed that the total global area of grassland ecosystems declined from 5175.73×104 km2 in the 1920s to 5102.16×104 km2 in the 1990s.The largest decrease,192.35×104 km2 ,oc-curred in tundra & alpine steppe ecosystems.The areas of desert grassland,typical grassland and temperate humid grassland decreased by 14.31,34.15 and 70.81×104 km2 respectively,while tropical savanna expanded by 238.06×104 km2 .Climate warming forced most grasslands to shift northwards,particularly in the northern hemisphere.Global grassland NPP increased from 25.93 Pg DW/yr in the 1920s to 26.67 Pg DW/yr in the 1990s.In terms of each grassland type,the NPP of the tundra and alpine steppe,desert grassland,typical grassland and temperate humid grassland decreased by 709.57,24.98,115.74 and 291.56 Tg DW/yr respec-tively.The NPP of tropical savanna increased by 1887.37 Tg DW/yr.At the global scale,precipitation was the dominant factor affecting grassland NPP.In general,grassland ecosystems have been substantially affected by climate change over the past 100 years.Although the global grassland NPP showed an overall increasing trend, the structure and distribution of particular grassland ecosystems had been adversely affected by the warmer and wetter climate.关键词
草地生态系统/综合顺序分类法(CSCS)/净初级生产力(NPP)/时空动态/分段模型Key words
grassland ecosystem/comprehensive sequential classification system (CSCS)/net primary produc-tivity (NPP)/spatiotemporal dynamics/the segmentation model引用本文复制引用
刚成诚,王钊齐,杨悦,陈奕兆,张艳珍,李建龙,程积民..近百年全球草地生态系统净初级生产力时空动态对气候变化的响应[J].草业学报,2016,25(11):1-14,14.基金项目
国家自然科学基金（31602004），西北农林科技大学博士科研启动基金项目（2452015339）和国家重点基础研究发展计划项目（2010CB950702）资助。 （）
