长沙东郊不同土地利用类型土壤CO_2通量初步研究  

Pilot Study on CO_2 Flux in Different Types of Land-use Soil in Eastern Suburbs of Changsha City

作　　者：常明[1] 周游[1] 余韵[1] 夏战鹰[1] 廖超林[1] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128

出　　处：《湖南农业科学》2011年第11期51-54,58,共5页Hunan Agricultural Sciences

基　　金：湖南省大学生研究性学习和创新性实验计划项目(SCX1027)

摘　　要：采用碱吸收田间容量法对长沙市东郊5种不同土地利用类型土壤CO2通量进行了观测研究。结果表明：5种土地利用方式土壤CO2排放通量的变化范围在13．77—425．52mg/m^2·h之间。不同土地利用类型土壤CO2通量表现不同，整体上以水田CO2通量最高，以林地最低；不同植被类型土壤CO2通量季节性变化趋势大致一致，均以2月份最低，最大值均出现在气温最高的8月。CO2排放通量与大气温度及土壤5em深处温度呈正相关，与土壤湿度呈较好的二次曲线相关。The CO2 flux in five different types of land-use soil in eastern suburbs of Changsha City was measured by alkali absorption process method. The results showed that the variation range of CO2 flux in five types of land-use soil is within 15.96--425.52 mg/m2·h. Generally, the CO2 flux is the highest in paddy-field and the lowest in forest land; the seasonal changing tendency of CO2 flux in different types of vegetation land is approximately the same that is the lowest in February and the highest in August when the temperature is the highest in the whole year. The CO2 flux is positively correlated with the air temperature and the temperature of soil in 5 cm depth, and it has good quadric correlation with soil moisture.

关 键 词：土地利用 土壤 CO2通量 

分 类 号：S152.6[农业科学—土壤学]