Study on soil carbon dioxide, methane flux of growing season in karst hilly area
Journal Title: 广东农业科学 - Year 2018, Vol 45, Issue 9
Abstract
The growing season in the karst hilly area of southwest China is long, and the flux of CO 2 and CH 4 on the soil surface is greatly affected by the vegetation cover on the surface. To investigate the CO 2 and CH4 fluxes and their diurnal variations of soil surface covered with vegetation (with grass) and non-vegetation cover (without grass) in the growing season of karst hilly area, the CO 2 and CH 4 fluxes on the soil surface in the Nanchuan karst hilly area in Chongqing were studied by static box-gas chromatography, combined with soil temperature and humidity research. The results showed that the surface of soil in karst hilly area showed CO 2 source and CH 4 sink during the growing season. The soil CO 2 fluxes were significantly higher than that of grass-free CO 2 fluxes, while there was no significant difference between grass and grass-free CH 4 fluxes on the soil surface. It indicates that vegetation cover on the surface of the growing season is an important factor affecting soil CO 2 flux, while vegetation cover has no significant effect on soil CH 4 flux. Soil CO 2 flux and grass-free CO 2 flux were 552 mg/m 2· h, 352 mg/m 2· h; Soil grass CH 4 flux and grass-free CH 4 flux were - 80μg/m 2· h,- 75 μg/m 2· h（6-month average of growing season）. On the scale of the growing season, the soil also appears as CO 2 source and CH 4 sink. The CO 2 flux of grasses was significantly higher than that of grass-free CO 2 fluxes, and the change characteristics of the two were onsistent; however, the CH 4 flux on the soil surface is less affected by vegetation cover. There is a positive correlation between soil CO 2 flux and soil temperature. That is, soil temperature increase will promote soil CO 2 flux, while soil CH 4 flux has no correlation with soil temperature, so soil temperature has no significant effect on soil CH 4 flux. Since the soil moisture change during the growing season is smaller than the soil temperature, the effect of soil moisture on soil CO 2 flux and soil CH 4 flux is smaller than soil temperature.
Authors and Affiliations
Jiu-chan LIU, Yu-chuan SUN
Keywords
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- EP ID EP602819
- DOI 10.16768/j.issn.1004-874X.2018.09.012
- Views 92
- Downloads 0
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