Experimental Warming on the Rice-Wheat Rotation Agroecosystem
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摘要: 为了揭示气候变暖与生态系统之间的反馈机制,自2007年12月至2010年6月间,依托上海市青浦区农田水利技术推广站实验基地开展了野外红外增温试验,以期预测未来长三角地区稻麦轮作生态系统中作物产量对气候变暖的响应.试验结果表明,在土壤温度升高一定值且保持现有农业管理方式不变的情景下,第1年度水稻地上部生物量和产量分别下降3.47%、5.84%,冬小麦地上部生物量和产量则分别上升6.55%、5.19%;第2年度,水稻生物量下降19.53%,根系生物量增加8.69%,产量下降22.57%,冬小麦地上部生物量和产量分别上升6.27%和5.00%;第3年度冬小麦地上部生物量、根系生物量及产量分别上升6.24%、43.73%、5.17%.另外,在增温条件下,水稻主要性状指标变化不显著,但冬小麦性状变化显著.Abstract: Experimental warming under field conditions has been applied in studies on feedback between climate warming and ecosystems in recent years.From Dec 2007 to Nov 2009,a warming experiment using infrared heaters on a rice-wheat rotation agroecosystem was conducted at the Agricultural Water Irrigation Technology Station in the Qingpu district of Shanghai to study fluctuations in production and biomass changes in response to future climate warming in the Changjiang River Delta,China.With no changes in the current agricultural management,the aboveground biomass and production of rice with warming decreased by 3.47% and 5.84% and of winter wheat increased by 6.55% and 5.19%,respectively,in the first year.The aboveground biomass and production of rice decreased by 19.53% and 22.57% and of winter-wheat increased by 6.27% and 5.00%,respectively,in the second year.However,the belowground biomass of rice increased by 8.69% in the growing season from Jun to Nov,2009.In the third year,the aboveground biomass and the production of winter-wheat increased by 6.24% and 5.17%,and the belowground biomass increased by 43.73%.In addition,the main traits of the winter wheat were affected significantly by experimental warming,but changes in the traits of rice were not significant.
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