line-level: 2" class=MsoNormal>Studies on Soil CO2-C Fluxes of Several Major Types of Land Covers in the Karst Region of
详细信息
- 责任者：Cheng Jianzhong(State Key Laboratory of Environmental Geochemistry ; Institute of Geochemistry ; Chinese Academy of Sciences ; Guiyang 550002 ; China) ; Li Xinqing
- 刊名：Geochimica
- 出版年：2010
- 卷期：39(3)
- 关键词：土壤 ; soils ; 二氧化碳 ; carbon dioxide ; 碳 ; carbon ; 西南地区 ; Southwest China
- 页码：p.258-265
- 图表：6 illus., 3 tables, 30 refs.
- 分类号：1800
- issnNo：ISSN0379-1726
- isbnNo：CN44-1398/P
摘要
The released soil CO2-C flux of four different land covers was studied in Guizhou karst region by static close chamber coupled with GC technique. The results showed that: 1) the released CO2-C flux of the four different land covers are significantly different, in a sequence of forest > secondary forest > burned field > maize field. The seasonal variation was obvious in all fields, with the highest average flux in summer and the lowest in winter; 2) the litter remarkably influenced the soil CO2-C flux in forest. The contribution of litter to forest total soil CO2-C emission was about 17%. Based on ground temperature, the calculated Q10 was 1.92 in the forest with litter and 2.10 in that without; and 3) excepted burned field and secondary forest, there was a remarkable positive correlation between soil CO2-C flux and temperature in different soil layers. By contrast, no obvious correlation between soil CO2-C flux and humidity (WFPS) was observed.