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《Journal of Mountain Science 山地科学学报(英文版)》 2014-03
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Effects of Land Cover on Soil Organic Carbon Stock in a Karst Landscape with Discontinuous Soil Distribution

CHEN Xiang-bi;ZHENG Hua;ZHANG Wei;HE Xun-yang;LI Lei;WU Jin-shui;HUANG Dao-you;SU Yi-rong;Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences;Huanjiang Observation and Research Station for Karst Eco-systems;Guangxi Institute of Subtropical Crops;  
Land cover type is critical for soil organic carbon(SOC) stocks in territorial ecosystems. However, impacts of land cover on SOC stocks in a karst landscape are not fully understood due to discontinuous soil distribution. In this study, considering soil distribution, SOC content and density were investigated along positive successional stages(cropland, plantation, grassland, scrubland, secondary forest, and primary forest) to determine the effects of land cover type on SOC stocks in a subtropical karst area. The proportion of continuous soil on the ground surface under different land cover types ranged between 0.0% and 79.8%. As land cover types changed across the positive successional stages, SOC content in both the 0–20 cm and 20–50 cm soil layers increased significantly. SOC density(SOCD) within 0–100 cm soil depth ranged from 1.45 to 8.72 kg m-2, and increased from secondary forest to primary forest, plantation, grassland, scrubland, and cropland, due to discontinuous soil distribution. Discontinuous soil distribution had a negative effect on SOC stocks, highlighting the necessity for accurate determination of soil distribution in karst areas. Generally, ecological restoration had positive impacts on SOC accumulation in karst areas, but this is a slow process. In the short term, the conversion of croplandto grassland was found to be the most efficient way for SOC sequestration.
【Fund】: supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA05070403);; the National Natural Science Foundation of China (Grant Nos. 41171246 41301273);; the National Science-technology Support Plan Projects (Grant No. 2012BAD05B03-6)
【CateGory Index】: S153.6
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