>
全球变化生态实验室英文网
Home|Research|Lab Members|Experiments|Projects|Publications|News|Photo|Collaboration|Download|Chinese
Paper
当前位置: Home>>Publications>>Y2017>>正文
Nonlinear responses of soil respiration to precipitation changes in a semiarid temperate steppe
  审核人:

Author: Miao, Y., H. Han, Y. Du, Q. Zhang, L. Jiang, D. Hui, and S. Wan.

Journal: Scientific Reports

Year: 2017

Volume: 7:45782

Abstract

Extreme precipitation events are predicted to occur more frequently and will have significant influences on terrestrial ecosystem carbon (C) cycling in the future. However, response patterns of soil respiration to precipitation changes remain uncertain in terrestrial ecosystems. A field experiment with seven precipitation treatments (i.e. from 60% to +60% of ambient precipitation to form a drought to wet precipitation gradient) was conducted over three growing seasons (20102012) in a semiarid temperate steppe of Northern China. Results showed a nonlinear response pattern of soil respiration along the experimental precipitation gradient, with soil respiration suppressed by decreased precipitation and enhanced by increased precipitation. Over the three growing seasons, soil respiration was reduced more under the three drought treatments (by 45.8, 32.8, and 15.9% under the 60, 40, and 20% treatments, respectively) than stimulated under the three wet treatments (by 8.9, 14.3, and 18.5% under the +20, +40, and +60% treatments, respectively). Our results indicate that soil respiration was more sensitive to decreased than increased precipitation treatments. The nonlinear and asymmetric responses of soil respiration to precipitation changes should be built into ecosystem models to project ecosystem C cycling associated with climate change.

Link

关闭窗口

Copyright:Laboratory of Global Change Ecology

elementnameelementnameelementnameelementname