Water-mediated responses of ecosystem carbon fluxes to climatic change in a temperate steppe

被引:433
作者
Niu, Shuli
Wu, Mingyu
Han, Yi
Xia, Jianyang
Li, Linghao
Wan, Shiqiang [1 ]
机构
[1] Chinese Acad Sci, Inst Bot, Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
[2] Grad Univ, Chinese Acad Sci, Beijing 100049, Peoples R China
关键词
carbon; evapotranspiration; global warming; grassland; precipitation;
D O I
10.1111/j.1469-8137.2007.02237.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Global warming and a changing precipitation regime could have a profound impact on ecosystem carbon fluxes, especially in arid and semiarid grasslands where water is limited. A field experiment manipulating temperature and precipitation has been conducted in a temperate steppe in northern China since 2005. A paired, nested experimental design was used, with increased precipitation as the primary factor and warming simulated by infrared radiators as the secondary factor. The results for the first 2 yr showed that gross ecosystem productivity (GEP) was higher than ecosystem respiration, leading to net C sink (measured by net ecosystem CO2 exchange, NEE) over the growing season in the study site. The interannual variation of NEE resulted from the difference in mean annual precipitation. Experimental warming reduced GEP and NEE, whereas increased precipitation stimulated ecosystem C and water fluxes in both years. Increased precipitation also alleviated the negative effect of experimental warming on NEE. The results demonstrate that water availability plays a dominant role in regulating ecosystem C and water fluxes and their responses to climatic change in the temperate steppe of northern China.
引用
收藏
页码:209 / 219
页数:11
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