Acclimation of CH_(4)emissions from paddy soil to atmospheric CO_(2)enrichment in a growth chamber experiment  

作　　者：Haoyu Qian Yaguo Jin Jin Chen Shan Huang Yunlong Liu Jun Zhang Aixing Deng Jianwen Zou Genxing Pan Yanfeng Ding Yu Jiang Kees Jan van Groenigen Weijian Zhang 

机构地区：[1]Institute of Crop Sciences,Chinese Academy of Agricultural Sciences,Beijing 100081,China [2]Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China [3]Soil and Fertilizer&Resources and Environmental Institute,Jiangxi Academy of Agricultural Science,Nanchang 330200,Jiangxi,China [4]Jiangxi Key Laboratory of Crop Physiology,Ecology and Genetic Breeding,Jiangxi Agricultural University,Nanchang 330045,Jiangxi,China [5]Center of Agriculture and Climate Change,Institute of Resource,Ecosystem and Environment of Agriculture,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China [6]Jiangsu Collaborative Innovation Center for Modern Crop Production/Key Laboratory of Crop Physiology and Ecology in Southern China,Nanjing Agricultural University,Nanjing 210095,Jiangsu,China [7]Department of Geography,College of Life and Environmental Sciences,University of Exeter,Exeter EX44RJ,UK

出　　处：《The Crop Journal》2022年第1期140-146,共7页作物学报（英文版）

基　　金：supported by the National Key Research and Development Program of China(2017YFD0300104,2016YFD0300903,2015BAC02B02);the National Natural Science Foundation of China(32022061);the Special Fund for Agroscientific Research in the Public Interest(201503118,201503122);the Agricultural Science and Technology Innovation Program of CAAS(Y2016PT12,Y2016XT01);the Modern Agricultural Development of Jiangsu Province(2019-SJ-039-07);the GEF Project of Climate Smart Staple Crop Production in China(P144531)。

摘　　要：Elevated levels of atmospheric CO_(2)(eCO_(2))promote rice growth and increase methane(CH_(4))emissions from rice paddies,because increased input of plant photosynthate to soil stimulates methanogenic archae.However,temporal trends in the effects of eCO_(2)on rice growth and CH_(4)emissions are still unclear.To investigate changes in the effects of eCO_(2)over time,we conducted a two-season pot experiment in a walk-in growth chamber.Positive effects of eCO_(2)on rice leaf photosynthetic rate,biomass,and grain yield were similar between growing seasons.However,the effects of eCO_(2)on CH_(4) emissions decreased over time.Elevated CO_(2)increased CH_(4)emissions by 48%-101%in the first growing season,but only by 28%-30%in the second growing season.We also identified the microbial process underlying the acclimation of CH4 emissions to atmospheric CO_(2)enrichment:eCO_(2)stimulated the abundance of methanotrophs more strongly in soils that had been previously exposed to eCO_(2)than in soils that had not been.These results emphasize the need for long-term eCO_(2)experiments for accurate predictions of terrestrial feedbacks.

关 键 词：Elevated CO_(2) Methane emissions RICE METHANOGENS METHANOTROPHS 

分 类 号：X16[环境科学与工程—环境科学] S511[农业科学—作物学]