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《Ecological Science》 2016-01
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Response of soil organic carbon to rocky desertification succession in south China karst and the analysis of its influence factors

WANG Linjiao;SHENG Maoyin;LI Rui;Karst Research Institute, Guizhou Normal University;School of Vocational and Technical, Guizhou Normal University;Guizhou Provincial Monitoring Station of Soil and Water Conservation;  
In this study, three typical karst rocky desertification regions, Yachi, Hongfenghu, and Huajiang of Guizhou Province, representing three typical karst landforms of plateau mountain, plateau basin, and plateau gorge respectively, were selected as experiment areas. Then, the soil organic carbon(SOC) was surveyed and analyzed by the methods of chemical determination and mathematical statistics. Results are as follows. 1)The SOC content of karst rocky desertification ecosystem is low, and the average SOC content of the three experiment sites studied is 23.42, 25.78 and 26.03 g·kg-1, respectively. 2) There are obvious differences of SOC content in different degrees of rocky desertification. But, not as expected, the SOC content does not always decrease with the increased degree of rocky desertification. In fact, with the increased degree of rocky desertification, the SOC content firstly decreases and then increases. 3) There are significant correlations between SOC content and other soil properties studied. The SOC content is extremely significant and positive correlation with soil total nitrogen content, hydrolysis nitrogen content, available potassium content, total porosity, natural moisture capacity, capillary moisture capacity, field moisture capacity, and upper strata saturated permeability, significant and positive correlation with soil total phosphorus content and lower strata saturated permeability, and extremely significant and negative correlation with soil bulk density. 4) The effect of land use and land cover change(LUCC) on SOC content in karst rocky desertification ecosystem is significant, and the effect of landform on SOC content is not obvious. Results have important values in the protection of karst forest ecosystem, the control of rocky desertification, and the scientific management for carbon cycle.
【Fund】: 贵州省社会发展攻关计划课题(黔科合SZ[2014]3036号);; 国家水利部公益性行业科研专项经费项目(201401050);; 贵州省水利厅科技项目(KT201409);; 贵州师范大学博士科研启动基金(2012)
【CateGory Index】: S153.6;X171
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