鄂西北山区耕层土壤pH值空间变异特征及其影响因素研究  

Spatial Variability of Soil pH Value and Its Influencing Factors in the Soil Layer of Northwestern Hubei Province

作　　者：吴正祥 周勇[1] 木合塔尔·艾买提 李晴 WU Zhen-xiang;ZHOU Yong;Muhtar·AMAT;LI Qing(School of Urban and Environmental Sciences,Central China Normal University,Wuhan 4300079,China;School of Environmental Science and Tourism,Nanyang Normal University,Nanyang 473061,China;College of Life and Geography,Kashgar University,Kashgar 844006,China)

机构地区：[1]华中师范大学城市与环境科学学院,湖北武汉430079 [2]南阳师范学院环境科学与旅游学院,河南南阳473061 [3]喀什大学生命与地理科学学院,新疆喀什844006

出　　处：《长江流域资源与环境》2020年第2期488-498,共11页Resources and Environment in the Yangtze Basin

基　　金：国家自然科学基金(41271534,40971218);自然资源部国土整治中心重点项目(2018-02-10);农业农村部耕地质量等级调查监测评价项目。

摘　　要：土壤pH值是耕地质量表征的重要指标之一,精确估算土壤pH值具有重要意义。以鄂西北山区十堰市为研究区,采集了701个耕作层土样,测定分析土壤pH值,运用地统计学方法和GIS技术探讨了鄂西北耕层土壤pH值的空间变异特征,利用方差分析和回归分析对其主要影响因素进行量化分析。结果表明:研究区土壤pH值为6.46±0.84,变异系数为13.00%,属中等变异强度。全市土壤pH值空间分布总体特征表现为低值区主要分布在研究区中部和西南部,高值区主要分布在北部和东南部;整体上呈现从东北向西南逐渐降低的空间分布格局,通过回归分析得出成土母质是研究区土壤pH值空间变异的主控因素,能够独立解释空间变异的13.6%,其次是海拔高度,独立解释能力为6.30%,较弱的是土地利用方式,独立解释能力仅为1.4%,坡度几乎没有独立解释能力。说明目前影响研究区耕层土壤pH值空间变异的主要影响因素是结构因素,土地利用方式和生产方式将是研究区土壤pH值进一步变化的重要驱动因素。Soil pH value is the major property influencing the cultivated land quality. It is important to measure and to understand the spatial distribution of soil pH value. In this research, Shiyan city was chosen as an example in the mountainous area of northwest Hubei province and a total of 701 soil samples of cultivated land were collected in Shiyan city for measurement of soil pH value. Furthermore, spatial variability of soil pH value in this region was analyzed by using the geo-statistics and GIS(Geographic Information System), and its dominating factors was analyzed by means of variance analysis and regression analysis. The result shows that the soil pH value of the region varies in the range of 6.46±0.84, with a variation coefficient being 13.00%, both indicate the soil belongs a moderate level. The overall trend of the spatial distribution of pH is that the lowest value appears in the middle and southwest of the study area and the highest value appears in the north and southeast. There is a decreasing trend of soil pH value from the northeast to the southwest. Regression analysis indicates that parent material of the soil was the dominating factor, which alone could explain 13.6% of the soil pH value spatial variability of the region. The second import factor is the altitude, which could explain 6.30% of the soil pH value spatial variability of the region. Land use pattern could only explain 1.4% of the soil pH value spatial variability of the region.and slope of cultivated land has almost no impact on soil pH. According to these research results, the most influenced factor on the soil pH variation is structural factors. Land use patterns and farming methods will be the important driving forces of soil pH value in the study region in the future.

关 键 词：土壤PH值 变异系数 地统计学 鄂西北山区 

分 类 号：S153.4[农业科学—土壤学]