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砒砂岩区小流域土壤有机质的空间分布及其环境影响因素研究
杨振奇1, 秦富仓1, 李 龙1, 任小同1, 钱秋颖1, 韩 君2
1.内蒙古农业大学沙漠治理学院;2.内蒙古大兴安岭重点国有林管理局
摘要:
通砒砂岩区是黄河中游粗泥沙集中来源区之一。研究砒砂岩区小流域土壤有机质空间分布特征及其与环境因子的关系,对于科学指导植被建设,减少入黄泥沙有重要意义。本文以砒砂岩区典型小流域为研究对象,于流域内布设150个样点,按照0 ~ 20、20 ~ 40、40 ~ 60 cm划分土层深度采集土壤样品,运用通径分析和冗余分析方法进行分析,研究结果表明:砒砂岩区小流域不同土地利用方式土壤有机质呈乔木林>灌木林>天然草地>耕地>裸地趋势,不同地形土壤有机质呈沟底>坡面>山脊的规律;冗余分析的结果显示,复合地形指数、土地利用方式、坡位以及土层厚度对砒砂岩区土壤有机质空间变异规律的解释量最大;通径分析的结果显示,环境因子与土壤有机质的关系可以用多元线性方程Y=1.054+0.099X1+2.722X2+0.766X3-0.001X4 来表示,其中坡位和土地利用方式是影响砒砂岩区小流域土壤有机质空间变异的主导因素,土层厚度与土壤有机质垂向变异密切相关。
关键词:  砒砂岩区  土壤有机质  环境解释  冗余分析  通径分析
DOI:10.13758/j.cnki.tr.2020.03.029
分类号:S157
基金项目:内蒙古科技计划项目(201802106)和国家自然科学基金青年基金项目(41807079)资助。
Study on Spatial Distribution of SOM and Environmental Impact Factors in Small Watershed of Feldspathic Sandstone Region
YANG Zhenqi1, QIN Fucang1, LI Long1, REN Xiaotong1, QIAN Qiuying1, HAN Jun2
1.College of Desert Science and Engineering, Inner Mongolia Agricultural University;2.Inner Mongolia Daxinganling Key State Forestry Administration
Abstract:
Feldspathic sandstone region is one of the main concentrated sources of coarse sediment in the middle reach of Yellow River. Studying the relationship between environmental factors and soil organic matter (SOM) has great significance to guide vegetation construction and reduce coarse sediment in Yellow River. We collected soil samples at 0-20, 20-40 and 40-60 cm depths in 150 sampling sites in Baojiagou Watershed of Feldspathic sandstone region in Jungar Qi of Inner Mongalia, measured SOM of the samples and analyzed its relationship with environmental factors through path analysis and redundancy analysis. The results showed that SOM content followed the order of arbor > shrub > grassland > farmland > bare land in different land use types, and the order of valley floor > slope > ridge in different topography. Redundancy analysis (RDA) demonstrated that TWI (topographic wetness index, X1), land use type (X3), slope position (X2) and soil thickness (X4) could strongly explained the spatial variation of SOM. Path analysis showed that the relation between SOM and environmental factors could be presented by Y=1.054+0.099X1+2.722X2+0.766X3-0.001X4 . In conclusion, slope position and land use type were the dominant factors affecting the spatial variation of SOM, soil thickness was closely related to the vertical spatial variation of SOM in feldspathic sandstone region.
Key words:  Feldspathic sandstone region  Soil organic matter  Environmental interpretation  Redundancy analysis  Path analysis

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