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Effects of land cover on Soil Organic Carbon Stock in a Karst landscape with Discontinuous Soil Distribution

Journal of Mountain Science 2014年第3期11卷 774-781页

作者： 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 O-lOO 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 8OC 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.

关键词： Soil organic carbon (SOC) Karst area Discontinuous soil distribution land cover type Carbon sequestration potential

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Spatio-temporal variations of vegetation carbon use efficiency and potential driving meteorological factors in the Yangtze River Basin

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Journal of Mountain Science 2020年第8期17卷 1959-1973页

作者： YE Xu-chun LIU Fu-hong ZHANG Zeng-xin XU Chong-yu LIU Jia Chongqing Key Laboratory of Karst Environment&School of Geographical Sciences of Southwest University Chongqing 400715China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Hohai UniversityNanjing 210098China Department of Geosciences University of Oslo N-0316Norway State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin Institute of Water Resources and Hydropower ResearchBeijing 100038China

Understanding of the vegetation dynamics is essential for addressing the potential threats of terrestrial *** recent years,the vegetation coverage of the Yangtze River Basin(YRB)has increased significantly,yet the spatio-temporal variations and potential driving meteorological factors of carbon use efficiency(CUE)under the context of global warming are still not *** this study,MODIS-based public-domain data during 2000–2015 was used to analyze these aspects in the YRB,a large river basin with powerful ecological functions in ***-temporal variations of CUE in different sub-basins and land cover types were investigated and the correlations with potential driving meteorological factors were *** revealed that CUE in the YRB had strong spatiotemporal variability and varied remarkably in different land cover *** the whole YRB,the average CUE of vegetated land was 0.519,while the long-term change trend of CUE was *** the rising altitude,CUE generally showed an increasing trend until the altitude of 3900 m and then followed by a decreasing *** of grasslands was generally higher than that of croplands,and then forest *** inter-annual variation of CUE in the YRB is likely to be driven by precipitation as a strong positive partial correlation between the inter-annual variability of CUE and precipitation was observed in most of sub-basins and land cover types in the *** influence of temperature and relative humidity is also outstanding in certain regions and land cover *** findings are useful from the view point of carbon cycle and reasonable land cover management under the context of global warming.

关键词： Carbon use efficiency Climate variability MODIS Altitude land cover type Precipitation

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