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- Title
CO emission response to different water conditions under simulated karst environment.
- Authors
Yuqing, Huang; Yanyu, Li; Guangping, Xu; Chengxin, He; Ling, Mo; Zhongfeng, Zhang; Jianhua, Cao; Daxing, Gu; Chunlai, Zhang; Yigang, Wei; Fang, Wen
- Abstract
Habitat degradation has been proven to result associated with drought in karst region in south China. However, how this drought condition relates to CO efflux is not clear. In this study, we designed a simulated epikarst water-rock (limestone)-soil-plant columns, under varying water levels (treatment), and monitored CO concentration and efflux in soil in different seasons during 2011. The results showed that increased soil water greatly enhanced CO concentrations. With which treatment with epikarst water (WEW) had higher CO concentration than without epikarst water (WOEW). This was particularly high in low soil water treatment and during high temperature in the summer season. Under 30-40 % relative soil water content (RSWC), CO concentration in WEW treatment was 1.44 times of WOEW; however, under 90-100 % RSWC, this value was smaller. Comparatively, soil surface CO efflux (soil respiration) was 1.29-1.94 μmol m s in WEW and 1.35-2.04 μmol m s in WOEW treatment, respectively. CO efflux increased with increasing RSWC, but it was not as sensitive to epikarst water supply as CO concentration. WEW tended to weakly influence CO efflux under very dry or very wet soil condition and under low temperature. High CO efflux in WEW occurred under 50-80 % RSWC during summer. Both CO concentrations and CO efflux were very sensitive to temperature increase. As a result, at degraded karst environment, increased temperature may enhance CO concentration and CO emission; meanwhile, the loss of epikarst and soil water deficiency may decrease soil CO concentration and CO emission, which in turn may decrease karst corrosion.
- Subjects
KARST; CARBON dioxide &; the environment; SOIL moisture; SOIL respiration; HIGH temperatures
- Publication
Environmental Earth Sciences, 2015, Vol 74, Issue 2, p1091
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-015-4539-8