Patterns and influencing factors of spatio-temporal variability of soil organic carbon in karst catchment
Patterns and influencing factors of spatio-temporal variability of soil organic carbon in karst catchment
复制标题
岩溶流域土壤有机碳时空变化格局及影响因素
DOI：
10.1504/ijgw.2019.10017599
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发表时间：
2019
期刊：
影响因子：
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通讯作者：
Xianfei Huang
中科院分区：
文献类型：
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作者：
Zhenming Zhang;Yunchao Zhou;Shijie Wang;Xianfei Huang
研究喀斯特集水区土壤有机碳储量的时空变异规律，为估算喀斯特地区土壤有机碳储量和选择土壤固碳技术措施提供科学依据。本文采用野外采样、实验室测量、地质统计学和地理信息系统相结合的方法，研究了1980-2015年后寨流域土壤有机碳的时空变化特征及其影响因素。结果表明，从整个流域的土壤样品来看，1980年和2015年土壤有机碳含量分别为21.98g/kg和25.07g/kg，增加3.09g·kg-1(14.58%)。近35年来，该地区土壤有机碳表现出空间结构弱化、相关性减弱、空间分布破碎化的特征。两个时期的土壤有机碳均呈现出东高西低、外围高中部低、南高北低的格局。然而，在嵌入或块分布中，一些局部值是高度可变的。影响后寨流域土壤有机碳时空变异性的关键因素是土壤类型、土地利用方式和主要环境因子。
The patterns of spatio-temporal variability of the soil organic carbon (SOC) stored in karst catchment were investigated, to provide a scientific basis for estimating SOC storage in karst regions and selecting technical measures for soil carbon sequestration. In this paper, field sampling, laboratory measurement, geostatistics, and geographic information system (GIS) were combined, to investigate the patterns and influencing factors of SOC's spatio-temporal variability in Houzhai catchment from 1980 to 2015. The results showed that according to the soil samples of the entire catchment, the SOC content averaged 21.98 g/kg in 1980 and 25.07 g/kg in 2015, with an increase of 3.09 g.kg‒1 (14.58%). Over the three and a half decades, SOC in this region showed weakened spatial structure, reduced correlation, and broken spatial distribution. Moreover, SOC in both periods presented a pattern of high values in the east and low values in the west, high in the periphery and low in the centre, and high in the south and low in the north. However, some local values were highly variable in embedded or block distribution. The key factors that could affect spatio-temporal variability of SOC in Houzhai catchment included the soil types, land utilisation, and major environmental factors.