红壤丘陵区晚稻生长期间CO_2的排放与固定规律  

CO_2 Emission and Fixation in Paddy Ecosystem During Late Rice Growing Season in Red Soil Hilly Region.

作　　者：周卫军[1] 朱良枝 郝金菊[1] 朱咏莉[3] 余乾文 郭海彦[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]湖南省临澧县农业局,湖南临澧415206 [3]中国科学院亚热带农业生态研究所,湖南长沙410125

出　　处：《生态与农村环境学报》2007年第1期7-11,共5页Journal of Ecology and Rural Environment

基　　金：国家自然科学基金重点项目(40235057);湖南农业大学人才引进项目(04YJ10)

摘　　要：采用静态箱法对红壤丘陵区稻田生态系统CO2排放与固定进行定位观测。结果表明,晚稻生长期间稻田生态系统CO2通量的日变化随天气条件(晴天、雨天、阴天)的变化而变化,CO2日净固定量在晚稻生长期间波动性很大,最高达10.35 g.m-2.d-1,在晚稻成熟期表现为CO2负固定,为-0.92 g.m-2.d-1;整个晚稻生育期,稻田生态系统CO2累积排放量和土壤呼吸CO2排放量分别为20.4和6.3 t.hm-2,稻田生态系统CO2累积排放量与水稻生物量之间存在极显著幂函数关系。在整个晚稻生育期,稻田生态系统从大气中吸收碳量为3.85 4.00 t.hm-2。Stationary observation of CO2 emission and fixation in paddy ecosystem was carried out during the late rice growing season, using the closed static chamber technique in a red soil hilly, region. It was found that CO2 flux varied with the weather condition （sunny,rainny,cloudy） from day to day. The daily net CO2 fixation fluctuated sharply during the season, peaking up to 10.35 g · m^- 2 · d^-1, and dropping down below zero, -0.92 g · m^-2·d^-1 , at the maturing stage of the crop. The CO2 accumulative emission from the paddy ecosystem reached 20.4 t · hm^-2 and from the soil through respiration 6.3 t· hm ^-2. The former was in an extreme power function relationship with the crop biomass. During the entire growing season of late rice, the paddy ecosystem fixed 3.85 to 4.00 t · hm^-2 C from the atmosphere.

关 键 词：晚稻生态系统 红壤丘陵区 CO2通量 碳固定 

分 类 号：X16[环境科学与工程—环境科学]