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Responses of a rice-wheat rotation agroecosystem to experimental warming

机译：稻麦轮作农业生态系统对实验变暖的响应

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摘要

Climate change is likely to affect agroecosys-tems in many ways. This study was performed to investigate how a rice-winter 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 3 years. In the third growing season (2009-2010), 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 2.57 ± 0.17 and 1.96 ± 0.06 μmol CO_2 m~(-2)s~(-1) 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 (0-5 cm). Warming also stimulated the below-ground 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.
机译：气候变化可能以多种方式影响农业生态系统。这项研究的目的是调查中国东南部的稻－冬小麦轮作农业生态系统如何应对全球变暖。通过使用红外加热器系统，土壤表面温度在3年中保持高于周围环境1.5℃。在第三个生长季节（2009-2010年），监测了蒸散量，作物产量，土壤呼吸和土壤碳库。水稻田生长季，温热区的ET率比对照区高23％，水稻籽粒产量低16.3％，但在冬小麦区，这些参数之间没有显着差异-生长季。冬小麦的物候在实验性变暖下发生了变化，并且在冬小麦生长季节后期，ET可能会降低。实验升温显着增强了土壤呼吸，在升温和对照样区观测到的年平均土壤呼吸速率分别为2.57±0.17和1.96±0.06μmolCO_2 m〜（-2）s〜（-1）。变暖3年后，观察到总有机碳显着下降，但仅在表层土壤（0-5 cm）内。气候变暖还刺激了地下生物量，这可能补偿了任何由热引起的土壤有机碳的损失。就水分利用效率和谷物产量而言，水稻似乎比冬小麦更容易变暖。

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  • 来源
    《Ecological research》 |2013年第6期|959-967|共9页
  • 作者

    Hao Cheng; Wenwei Ren; Lele Ding; Zengfu Liu; Changming Fang;

  • 作者单位

    Institute of Biodiversity Science, Fudan University,#220 Handan Road, Shanghai 200433, China;

    WWF China-Shanghai Office, #121 Zhongshan No.l Road,Hongkou District, Shanghai 200083, China;

    Youth Business China-Yangpu Office, Room 208,200# Guoding East Road, Yangpu District,Shanghai 200433, China;

    WWF China-Shanghai Office, #121 Zhongshan No.l Road,Hongkou District, Shanghai 200083, China;

    Institute of Biodiversity Science, Fudan University,#220 Handan Road, Shanghai 200433, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Evapotranspiration; Experimental warming; Rice-winter wheat rotation; Soil respiration;

    机译：蒸发蒸腾;实验升温稻－冬小麦轮作;土壤呼吸;

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