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砒砂岩区典型小流域表土有机质含量空间自相关格局及影响因素
杨振奇1, 秦富仓2, 李龙2, 钱秋颖2
1.水利部牧区水利科学研究所, 呼和浩特 010020;2.内蒙古农业大学沙漠治理学院, 呼和浩特 010018
摘要:
以砒砂岩区鲍家沟小流域为研究对象,运用地统计学和灰色关联度相结合的方法,研究砒砂岩区小流域表土有机质的空间自相关特征及影响因素。结果表明:①砒砂岩区小流域表土有机质空间变异的半方差函数拟合模型为指数模型,块金效应值为60.66%,属中等程度的空间相关性,流域表土有机质整体呈沟底>坡面>山脊的规律。②全局空间自相关分析显示,表土有机质具有明显的空间自相关性(Z值为2.80),各向异性的空间自相关性与径流流向关系密切,局部空间自相关特征以高值聚集和低值聚集类型为主,存在少量的高低值聚集异常区。③高值聚集现象主要出现在流域中部的沟谷和乔木林地区域。低值聚集区集中分布在流域下部的裸露坡面区,异常区在流域的上部和下部均有分布,集中坡面草地。④土壤有机质空间自相关性与环境因子的灰色关联分析的结果显示,高值聚集区与地形湿度指数的关联系数最高(0.498),低值聚集区坡位关联程度最高(0.489),高/低值异常区域土地利用方式关联程度最高(0.329)。地形因素是促使砒砂岩区小流域表土有机质高值聚集区形成的主导因素,土地利用能够干扰表土有机质高/低值聚集区的形成。
关键词:  砒砂岩区  表土有机质  空间自相关格局  灰色关联分析  影响因素
DOI:10.13758/j.cnki.tr.2021.02.026
分类号:S159
基金项目:内蒙古科技计划项目(201802106)、国家自然科学基金青年基金项目(41807079)和内蒙古自然基金项目(2015MS0402)资助。
Analysis of Spatial Autocorrelation Patterns and Influencing Factors of Topsoil Organic Matter Content in Typical Small Watershed in Feldspathic Sandstone Region
YANG Zhenqi1, QIN Fucang2, LI Long2, QIAN Qiuying2
1.Institute of Water Resources for Pastoral Area of the Ministry of Water Resources of China Hohhot, 010020, China;2.College of Desert Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
Abstract:
In this study, through geostatistics analysis and grey relation analysis, the relationship between environmental factors and spatial autocorrelation patterns of topsoil SOM in Baojiagou watershed of feldspathic sandstone region was studied. The results showed that spherical model was appropriate to evaluate the spatial distribution of topsoil SOM of small watershed in soft sandstone area, the values of nugget-to-sill were 60.66%, and the spatial autocorrelation of topsoil SOM was at moderate level, it was also found that topsoil SOM content according to topographic factors was in a trend of valley floor>slope> ridge. Global spatial autocorrelation showed that topsoil SOM had an obvious characteristic of positive autocorrelation, the local spatial autocorrelation mainly displayed a high with high correlation and low with low correlation types, and few high with low value agglomeration. The H-H agglomeration was mainly distributed in the valley and forest in the middle of watershed, the L-L agglomeration mainly in the bare slope in the downside of watershed, and the anomalous zone in the grass slope in the upside and downside of watershed. The results of grey correlative degree analysis showed that topographic wetness index (TWI) had the most significant influence on H-H agglomeration, slope position had the strongest correlation with L-L agglomeration, with associated degree 0.489, land use type was the important factor influencing the anomalous zone of H-L agglomeration. In conclusion, topographic factors are the leading factors for the formation of high value accumulation areas of topsoil SOM in small watershed of feldspathic sandstone area, while land use type can interfere with the formation of high/low value accumulation areas of topsoil SOM.
Key words:  Feldspathic sandstone region  Spatial autocorrelation patterns  Spatial autocorrelation patterns  Grey relation analysis  Influencing factors

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