大九湖泥炭湿地生态系统碳水通量及水分利用效率研究  

Studies on Carbon-water Flux and Water Use Efficiency in Dajiuhu Peat Wetland Ecosystem

作　　者：李金群 葛继稳[1,2,3] 彭凤姣[4] 李艳元[5] 周颖 李永福 翁文畅[1,2,3] LI Jinqun;GE Jiwen;PENG Fengjiao;LI Yanyuan;ZHOU Ying;LI Yongfu;WENG Wenchang(Laboratory of Basin Hydrological and Wetland Eco-restoration,China University of Geosciences (Wuhan),Wuhan 430074,China;Hubei Key Laboratory of Wetland Evolution and Ecological Restoration,China University of Geosciences(Wuhan),Wuhan 430074,China;Institute of Ecology and Environmental Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China;Central Southern China Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Wuhan 430071,China;Wuhan Wetland Institute of Ecology and Environmental Sciences,Wuhan 430079,China)

机构地区：[1]中国地质大学(武汉)盆地水文过程与湿地生态恢复学术创新基地,湖北武汉430074 [2]中国地质大学(武汉)湿地演化与生态恢复湖北省重点实验室,湖北武汉430074 [3]中国地质大学(武汉)生态环境研究所,湖北武汉430074 [4]中国电力工程顾问集团中南电力设计院有限公司,湖北武汉430071 [5]武汉伟特伦生态环境研究所,湖北武汉430079

出　　处：《安全与环境工程》2019年第1期14-25,共12页Safety and Environmental Engineering

基　　金：环境保护部生态环境十年变化遥感调查与评估项目(2012046151;2012046395);中国地质大学(武汉)中央高校基本科研业务费专项资金项目(1323521225;1323521325)

摘　　要：为研究大九湖泥炭湿地生态系统碳水通量及水分利用效率(WUE)的变化特征,于2015年12月至2017年11月采用涡度相关观测系统对大九湖泥炭湿地生态系统CO_2通量、H_2O通量和环境因子进行了监测。结果表明:①大九湖泥炭湿地生态系统各季节的CO_2通量和H_2O通量整体均呈现单峰型曲线,其中夏季碳水通量的变化幅度最大,冬季碳水通量的变化幅度最小;②大九湖泥炭湿地生态系统CO_2通量与H_2O通量在0.01的检验水平上显著相关,且两者的比值存在一定的函数关系,其中三次拟合效果最优,拟合优度R^2为0.38;③大九湖泥炭湿地生态系统WUE的变化范围为0.06～13.95g C/kg H_2O,其日均值为3.26g C/kg H_2O,各季节湿地生态系统WUE的变化幅度表现为夏季>冬天>秋季>春季;④大九湖泥炭湿地生态系统WUE与蒸散量(ET)的拟合关系中,夏季和冬季的拟合效果较好,随着ET的增加,湿地生态系统WUE不断减小;⑤大九湖泥炭湿地生态系统WUE与气温(T_a)的拟合关系中,夏季拟合效果较好,随着T_a的升高,湿地生态系统WUE不断减小;⑥大九湖泥炭湿地生态系统WUE与土壤温度(T_s)的拟合关系中,秋季拟合效果较好,随着T_s的升高,湿地生态系统WUE增加。该研究结果可为大九湖泥炭湿地生态系统变化趋势的预测及功能调控提供理论支持,也可为正确评价湿地生态系统碳水耦合、水分利用效率提供科学依据。In order to study carbon-water flux and Water Use Efficiency(WUE),this paper uses eddy covariance technology to observe CO2 flux,H2O flux and environmental factors from December 2015 to November 2017 in Dajiuhu peat wetland.The results show that①In Dajiuhu peat wetland,seasonal CO2 flux and H2O flux are all represented as a unimodal type curve.The change rule of summer is most evident and it is not obvious in winter;②There is a significant correlation between CO2 flux and H2O flux and functional relationship existed among them.The cubic fitting equation was optimal,with the fitting result of about 0.38;③The daily variation range of WUE in two years is 0.06~13.95 g C/kg H2O,with a daily mean value of 3.26 g C/kg H 2O.The range in every season is summer >winter >autumn >spring;④The functional relationship between WUE and evapotranspiration(ET)is a quadratic fitting equation.The fitting results in summer and winter are better.With the increasing of evapotranspiration(ET),WUE decreases;⑤The functional relationship between WUE and temperature(Ta)is a quadratic fitting equation.The fitting result in summer is better.With the rise of temperature(Ta),water use efficiency(WUE)decreases;⑥The functional relationship between WUE and soil temperature(ts)is a quadratic fitting equation.The fitting result in autumn is better.With the rise of soil temperature(ts),water use efficiency(WUE)increases.

关 键 词：大九湖泥炭湿地 生态系统 CO2通量 H2O通量 水分利用效率(WUE) 蒸散量 气温 土壤温度 

分 类 号：X171[环境科学与工程—环境科学]