Primary Productivity and Precipitation-Use Efficiency in Temperate Grassland in the Loess Plateau of China
Jia X. X.; Xie, B. N.; Shao, M.; Zhao, C. L.
2015
关键词net primary productivity water-use efficiency rain-use efficiency dried soil layers semiarid grassland inner-mongolia northern china united-states ecosystem variability
英文摘要Clarifying spatial variations in aboveground net primary productivity (ANPP) and precipitation-use efficiency (PUE) of grasslands is critical for effective prediction of the response of terrestrial ecosystem carbon and water cycle to future climate change. Though the combination use of remote sensing products and in situ ANPP measurements, we quantified the effects of climatic [mean annual precipitation (MAP) and precipitation seasonal distribution (PSD)], biotic [leaf area index (LAI)] and abiotic [slope gradient, aspect, soil water storage (SWS) and other soil physical properties] factors on the spatial variations in ANPP and PUE across different grassland types (i.e., meadow steppe, typical steppe and desert steppe) in the Loess Plateau. Based on the study, ANPP increased exponentially with MAP for the entire temperate grassland; suggesting that PUE increased with increasing MAP. Also PSD had a significant effect on ANPP and PUE; where more even PSD favored higher ANPP and PUE. Then MAP, more than PSD, explained spatial variations in typical steppe and desert steppe. However, PSD was the dominant driving factor of spatial variations in ANPP of meadow steppe. This suggested that in terms of spatial variations in ANPP of meadow steppe, change in PSD due to climate change was more important than that in total annual precipitation. LAI explained 78% of spatial PUE in the entire Loess Plateau temperate grassland. As such, LAI was the primary driving factor of spatial variations in PUE. Although the effect of SWS on ANPP and PUE was significant, it was nonetheless less than that of precipitation and vegetation. We therefore concluded that changes in vegetation structure and consequently in LAI and/or altered pattern of seasonal distribution of rainfall due to global climate change could significantly influence ecosystem carbon and water cycle in temperate grasslands.
出处Plos One
10
8
收录类别SCI
语种英语
ISSN号1932-6203
内容类型SCI/SSCI论文
源URL[http://ir.igsnrr.ac.cn/handle/311030/38665]  
专题地理科学与资源研究所_历年回溯文献
推荐引用方式
GB/T 7714
Jia X. X.,Xie, B. N.,Shao, M.,et al. Primary Productivity and Precipitation-Use Efficiency in Temperate Grassland in the Loess Plateau of China. 2015.
个性服务
查看访问统计
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。


©版权所有 ©2017 CSpace - Powered by CSpace