基于地统计和移动窗口法的坝上地区小尺度土壤盐分空间变异及其影响因素

发布时间：2018-08-25 18:53

【摘要】：采用原位测定法测定坝上地区典型河漫滩草地土壤盐分,分析不同深度土壤盐分含量的空间变异规律,并分别通过地统计和移动窗口法定量分析河流和微地形对小尺度土壤盐分空间变异的影响.结果表明:离水体越近,盐分值越大;土层越浅,盐分值越大;表层土壤盐分的变化大于底层;受人为扰动影响,土壤盐分与微地形呈低相关性;在地下水埋深较浅的地区,垄沟对盐分分布的影响相对较小.以移动窗口为基本单元可以使空间格局信息明晰化,为土壤盐分空间变异研究提供新途径.土壤盐渍化治理时要充分考虑水体、地形等因素的影响,对河流沿岸以及地下水埋深较浅的小高地等盐渍化易发区采用生物措施、工程措施及农化措施等方法进行重点防治.本研究结果可为小尺度土壤盐分空间变异影响因素的定量研究提供一定的参考,对坝上草原地区牧场土壤盐渍化问题的防治提供理论依据.
[Abstract]:The soil salinity of typical floodplain grassland in Bashang area was measured by in-situ method, and the spatial variation of soil salt content in different depths was analyzed. The effects of river and microtopography on the spatial variation of soil salinity in small scale were analyzed by means of geostatistics and moving window method respectively. The results show that the closer to the water body, the greater the salt value; the more shallow the soil layer, the greater the salt value; the larger the change of surface soil salinity is, the lower the correlation between soil salinity and microtopography is affected by human disturbance, and the lower the depth of groundwater is. The influence of furrows on salt distribution is relatively small. Using moving window as the basic unit can make spatial pattern information clear and provide a new way for the study of soil salt spatial variation. In the process of soil salinization treatment, the effects of water body, topography and other factors should be fully taken into account. The measures of biological measures, engineering measures and agricultural measures should be used to prevent and cure the salinization easily occurring along the river banks and the small highlands with shallow groundwater depth. The results of this study can provide a certain reference for quantitative study on the influencing factors of spatial variation of soil salinity in small scale and provide theoretical basis for the prevention and control of soil salinization in pastureland in Bashang grassland.
【作者单位】：北京师范大学地理科学学部地理学院;
【基金】：国家自然科学基金资助项目(41301282) 国家基础科学人才培养基金资助项目(J1103403)
【分类号】：S156.4

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