Responses of a riceheat rotation agroecosystem to experimental warming

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• 作者：Hao Cheng (1)
  Wenwei Ren (2)
  Lele Ding (3)
  Zengfu Liu (2)
  Changming Fang (1)
  
• 关键词：Evapotranspiration ; Experimental warming ; Riceinter wheat rotation ; Soil respiration
• 刊名：Ecological Research
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：28
• 期：6
• 页码：959-967
• 全文大小：
• 作者单位：Hao Cheng (1)
  Wenwei Ren (2)
  Lele Ding (3)
  Zengfu Liu (2)
  Changming Fang (1)
  
  1. Institute of Biodiversity Science, Fudan University, #220 Handan Road, Shanghai, 200433, China
  2. WWF China-Shanghai Office, #121 Zhongshan No.1 Road, Hongkou District, Shanghai, 200083, China
  3. Youth Business China-Yangpu Office, Room 208, 200# Guoding East Road, Yangpu District, Shanghai, 200433, China
  
• ISSN：1440-1703

文摘

Climate change is likely to affect agroecosystems in many ways. This study was performed to investigate how a riceinter wheat rotation agroecosystem in southeast China would respond to global warming. By using an infrared heater system, the soil surface temperature was maintained about 1.5 above ambient milieu over 3years. In the third growing season (2009010), the evapotranspiration (ET) rate, crop production, soil respiration, and soil carbon pool were monitored. The ET rate was 23% higher in the warmed plot as compared to the control plot during the rice paddy growing season, and the rice grain yield was 16.3% lower, but there was no significant difference in these parameters between the plots during the winter wheat-growing season. The phenology of the winter wheat shifted under experimental warming, and ET may decrease late in the winter wheat-growing season. Experimental warming significantly enhanced soil respiration, with mean annual soil respiration rates of 2.570.17 and 1.960.06ol CO2 m2s1 observed in the warmed and control plots, respectively. After 3 years of warming, a significant decrease in the total organic carbon was observed, but only in the surface soil (0cm). Warming also stimulated the belowground biomass, which may have compensated for any heat-induced loss of soil organic carbon. Paddy rice seemed to be more vulnerable to warming than winter wheat in terms of water-use efficiency and grain production.