| 土壤温度和水分对克氏针茅草原生态系统碳通量的影响初探 |
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| 引用本文： | 李琪,薛红喜,王云龙,胡正华,李洁.土壤温度和水分对克氏针茅草原生态系统碳通量的影响初探[J].农业环境保护,2011(3):605-610. |
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| 作者姓名： | 李琪 薛红喜 王云龙 胡正华 李洁 |
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| 作者单位： | [1]南京信息工程大学环境科学与工程学院,南京210044 [2]中国气象局气象探测中心,北京100081 |
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| 基金项目： | 中国气象局气象新技术推广项目（CMATG2010Z05）; 南京信息工程大学科研启动项目（20080264） |
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| 摘 要： | 草地和大气间碳通量的观测有助于理解草原生态系统的碳循环及其控制机理。利用涡度相关技术观测了克氏针茅草原生态系统与大气之间的净生态系统碳交换（NEE）、生态系统初级生产力（GEP）、生态系统呼吸（Rec）o的变化,探讨了2008年生长季内土壤温度和水分对克氏针茅草原生态系统NEE、GEP和Reco的影响。结果表明,2008年生长季内,克氏针茅草原日尺度上NEE和GEP都出现了3个峰,二者之间有极显著的相关性,Reco则呈现倒＂U＂型变化规律。克氏针茅草原土壤温度与NEE、GEP呈二次曲线的关系,而与Reco呈指数关系,土壤水分的增加会提高克氏针茅草原生态系统的固碳能力、初级生产力及呼吸作用。土壤温度和水分是影响克氏针茅草原生态系统碳收支的重要因子。
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| 关 键 词： | 土壤温度 土壤水分 碳通量 克氏针茅草原生态系统 涡度相关 |
The Preliminary Study on the Impact of Soil Temperature and Moisture on Carbon Flux Over Stipa krylovii Ecosystem |
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| LI Qi,XUE Hong-xi,WANG Yun-long,HU Zheng-hua,LI Jie.The Preliminary Study on the Impact of Soil Temperature and Moisture on Carbon Flux Over Stipa krylovii Ecosystem[J].Agro-Environmental Protection,2011(3):605-610. |
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| Authors: | LI Qi XUE Hong-xi WANG Yun-long HU Zheng-hua LI Jie |
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| Institution: | 1.School of Environmental Science and Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;2.Meteorological Observation Centre of CMA,Beijing 100081,China) |
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| Abstract: | Long-term measurement of the carbon fluxes between the grassland and the atmosphere has facilitated the research on carbon cycle in grassland ecosystems and its controlling mechanism.Based on the eddy covariance technique,the variations of the net ecosystem carbon exchange（NEE）,the gross ecosystem productivity（GEP） and the ecosystem respiration（Reco） over stipa krylovii ecosystem were measured,and the impact of soil temperature and moisture on the NEE,GEP and Reco was discussed during the growing season in 2008.As discussed in the paper,there had three peaks of the NEE and GEP patterns for Stipa krylovii ecosystem on the daily-scale level during the growing season in 2008,and there existed very significant correlation between NEE and GEP.Shown in the Reco pattern by the inverted U-shaped pattern,the respiration function first increased and then decreased as the time went on,which illustrated conic correlation between the soil temperature and the NEE and GEP,and the Reco was correlated exponentially with the soil temperature on daily-scale level.All three equations had highly significant correlation.The carbon fixation ability,the gross productivity and the respiration function of stipa krylovii ecosystem improved with the increase of the soil moisture.Thus,the soil temperature and moisture,but not limited to,were the important factors to impact the carbon budget of the Stipa krylovii ecosystem.The control mechanism of the soil temperature and moisture on the carbon flux over Stipa krylovii ecosystem was very complicated,and upon the different time scale,Stipa krylovii ecosystem had the different feedback mechanism to the soil temperature and moisture. |
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| Keywords: | soil temperature soil moisture carbon flux Stipa krylovii ecosystem eddy covariance |
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