大气CO_(2)浓度上升与增温对双季稻田溶解性有机碳变化特征的影响  

Effects of rising atmospheric CO_(2) concentration and warming on the variation of dissolved organic carbon in double cropping rice fields

作　　者：李敏[1] 贾羽旋 孙娟 王斌[3] 武雨欣 王顺利[1] 石生伟 LI Min;JIA Yuxuan;SUN Juan;WANG Bin;WU Yuxin;WANG Shunli;SHI Shengwei(College of Biological and Resource Environment,Beijing University of Agriculture,Beijing 102206,China;Beijing Agricultural Product Quality Safety Test Center,Beijing 100029,China;Institute of Agri-cultural Environment and Sustainable Development,Chinese Academy of Agricultural Sciences,Beijing 100081,China)

机构地区：[1]北京农学院生物与资源环境学院,北京102206 [2]北京市农产品质量安全中心,北京100029 [3]中国农业科学院农业环境与可持续发展研究所,北京100081

出　　处：《生态学杂志》2023年第3期653-661,共9页Chinese Journal of Ecology

基　　金：国家自然科学基金(41401277,1905102);大气重污染成因与治理攻关项目(DQGG0208-02)资助。

摘　　要：以大气CO_(2)浓度上升和温度增加为主要特征的全球气候变化是影响全人类可持续发展的热点问题。本研究采用开顶式气室(open top chamber,OTC)系统模拟大气CO_(2)浓度上升(EC处理,+100 ppm)和增温(ET处理,+1.5℃)的气候变化情景,对江汉平原双季稻主要生长期地表水和土壤孔隙水溶解性有机碳(DOC)浓度、芳香性指数、生物量和产量及相关因素进行观测。结果表明:与CK相比,EC处理显著增加早稻灌浆期土壤20 cm孔隙水DOC浓度,增幅为284.2%(P<0.05);EC处理显著降低早稻孕穗期和抽穗期的DOC芳香性指数,降幅分别为36.9%和31.6%(P<0.05)。EC处理显著降低早稻拔节期土壤20 cm DOC芳香性指数(-35.5%)(P<0.05)。与EC和ET处理相比,大气CO_(2)浓度上升与增温的叠加处理(ETEC)显著增加稻田整个生长期土壤20 cm孔隙水DOC芳香性指数,增幅为23.6%~51.4%(P<0.05)。EC和ET处理均显著增加了双季稻的地上生物量和籽粒产量(P<0.05)。本研究为探索江汉平原双季稻对未来气候变化的响应以及稻田生态系统的碳循环关键过程提供科学参考依据。Global climate change,characterized by elevated atmospheric CO_(2)concentration and temperature,is an important issue affecting human sustainable development.In this study,open top chamber(OTC)systems were used to simulate climate change scenarios of rising atmospheric CO_(2)concentration(EC,+100 ppm)and increasing temperature(ET,+1.5℃).The concentration of dissolved organic carbon(DOC)in surface water and pore water,aromaticity index,biomass,yield and related driving factors of double cropping rice in Jianghan Plain were observed.The results showed that DOC concentration in soil pore water at 20 cm soil layer during the filling stage of early rice was significantly increased by 284.2%under EC treatment,compared with CK(P<0.05),and DOC aromaticity index under EC treatment was significantly decreased by 36.9%and 31.6%at booting stage and heading stage(P<0.05),respectively.DOC aromaticity index at 20 cm soil layer during the jointing stage of early rice reduced by 35.5%under EC treatment(P<0.05).Compared with EC and ET treatments,DOC aromaticity index of soil pore water at 20 cm soil depth under the combined treatment of atmospheric CO_(2)concentration increasing and warming(ETEC)was significantly increased,with a range of 23.6%-51.4%during the whole growing period of paddy field(P<0.05).Both EC and ET treatments significantly increased aboveground biomass and grain yield of double cropping rice(P<0.05).This study provided scientific evidence for exploring the responses of double cropping rice to climate change and the key processes of carbon cycling in paddy ecosystems in Jianghan Plain in China.

关 键 词：CO_(2)浓度 增温 DOC浓度 芳香性指数 籽粒产量 

分 类 号：S153.6[农业科学—土壤学]