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当前位置: 首页 > 文章 > 冬小麦旺盛生长期CO_2浓度升高对土壤呼吸的影响 农业环境科学学报 2007,26 (03) 1111-1116
Position: Home > Articles > Effect of Elevated Atmospheric pCO_2 on Soil Respiration During Wheat Bloom-Growth Period Journal of Agro-Environment Science 2007,26 (03) 1111-1116

冬小麦旺盛生长期CO_2浓度升高对土壤呼吸的影响

作  者：
寇太记;朱建国;谢祖彬;刘钢;曾青;李小平;T.Hasegawa
单  位：
日本农业环境技术研究所;中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室
关键词：
CO2浓度升高;冬小麦;土壤呼吸;生育阶段;Q10
摘  要：
土壤呼吸是全球碳循环的一个重要组成部分、土壤碳库的主要输出途径和大气CO2重要的源。利用FACE(free-air CO2 enrichment)技术平台,采用LI6400红外气体分析仪(IRGA)-田间原位测定的方法,研究了大气CO2浓度升高和不同氮肥水平对水稻/小麦轮作制中冬小麦生长期间土壤呼吸的影响。结果表明,在整个测定期间,CO2浓度升高均增强了土壤呼吸的排放速率和释放量,增幅随着氮肥施用量的增加而增大,土壤呼吸在孕穗-抽穗期达到最大值。土壤呼吸同土壤温度呈极显著的指数相关;随施氮量从112.5kg·hm-2增加到2255kg·hm-2,FACE处理的Q10值从2.98增大为3.26,但比相应的Ambient(对照浓度)处理的Q10值下降了6.3%和18.3%,显然CO2浓度升高降低了土壤呼吸对温度增加的敏感性。总之,大气CO2浓度升高将加快土壤向大气的CO2排放,将有助于评价未来高CO2浓度环境对农田生态系统土壤碳循环的影响。
译  名：
Effect of Elevated Atmospheric pCO_2 on Soil Respiration During Wheat Bloom-Growth Period
作  者：
KOU Tai-ji1,2,ZHU Jian-guo1,XIE Zu-bin1,LIU Gang1,ZENG Qing1,LI Xiao-ping1,T.Hasegawa3(1.State Key Laboratory of Soils and Sustainable Agriculture,Insititue of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;2.Graduate School,the Chinese Academy of Sciences,Beijing 100049,China;3.National Institute for Agro-environmental Sciences,Tsukuba,Japan 305-8604)
关键词：
elevated pCO2;winter wheat;soil respiration;growth stage;Q10
摘  要：
Soil respiration is one of the important parts in the global carbon cycle.It plays a pivotal role in releasing C from soil C pool to the atmosphere.With FACE(Free Air Carbon Dioxide Enrichment) system,the effects of elevation of atmospheric CO2 concentration and different application rates of nitrogen fertilizer on soil respiration were evaluated using IRGA(LI6400) in situ,during the wheat growth period in rice-wheat rotation system at Jiangdu of Jiangsu province,China.The results showed that elevated CO2 concentrations enhanced soil respiration rates and cumulative CO2 emissions in the entire study period,with the increasing range markedly promoted by the increasing of nitrogen fertilizer applied,and the soil respiration rates reached the peak at booting-heading stage of winter wheat.A significant exponential-correlation between the soil respiration rate and the soil temperature was observed.Although Q10 values of FACE increased from 2.98 to 3.26 with the increasing of nitrogen fertilizer application from 112.5 kg·hm-2 to 225 kg·hm-2,they were 6.3% and 18.3% smaller than those in the ambient treatment(control),respectively.The results indicated that the elevated pCO2 depressed the sensitivity of soil respiration to the increment of soil temperature.The increase of soil respiration under conditions of elevated atmospheric pCO2 suggests that,C exchange between the atmosphere and soil would increase in arable ecosystems under future higher CO2 scenarios.

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