湖北省土壤酸碱度趋势分析及影响因素

Trend Analysis and Influencing Factors of Soil Acidity and Alkalinity in Hubei

湖北省"金土地"工程项目获得了大量地球化学数据,对该项目三年所取得的数据进行抽样研究,系统分析沿江平原区、鄂北岗地区、鄂西山区三大区20个县市耕地土壤酸碱度,其总体特征表现为:沿江平原区>鄂北岗地区>鄂西山区。趋势分析可见:沿江平原区自西向东土壤pH值显著上升,表现为一阶线性趋势,自北向南土壤pH值为二阶非线性趋势;鄂北岗地区自西向东土壤pH值显著上升,表现为一阶线性趋势,自北向南土壤pH值为二阶非线性趋势;鄂西山区自西向东土壤pH值显著上升,表现为一阶线性趋势,自北向南土壤pH值为二阶非线性趋势。土壤类型对土壤酸碱度的影响:草甸土>潮土>石灰土>沼泽土>紫色土>黄棕壤>黄壤>水稻土>棕壤,土壤类型对土壤酸碱度影响较大。成土母质对黄棕壤pH值的影响:泥质岩>碳酸盐岩>红砂岩;不同成土母质棕壤pH值:石灰岩>泥质岩>石英砂岩;不同成土母质红壤pH值:泥质页岩>石英砂岩>红砂岩;不同成土母质黄壤pH值:红砂岩>碳酸盐岩。

A great deal of geochemical data have been obtained from the project of“Golden Land”in Hubei Province.In this paper,the soil acidity and alkalinity of cultivated land in20counties and cities in the Plains along the Yangtze River,the northern part of Hubei Province and the western part of Hubei Province are systematically analyzed by sampling the data obtained from the project for three years.The general characteristics of soil acidity and alkalinity are as follows:along the Yangtze River plain>Northern Hubei hilly land>western Hubei mountain area.Trend analysis shows:the soil pH value significant rise from the west to the east along the Yangtze river plain,characterized by first order linear trend,from north to south the soil pH value of second order nonlinear trend;In north evaluation area soil pH value significant rise from the west to the east,characterized by first order linear trend,from north to south the soil pH value of second order nonlinear trend.In north ordos downland evaluation area soil pH value significant rise from the west to the east,characterized by first order linear trend,from north to south the soil pH value of second order nonlinear trend.Evaluation of western Hubei mountainous area soil pH value significant rise from the west to the east,characterized by first order linear trend,from north to south the soil pH value of second order nonlinear trend.Soil types have a great influence on soil acidity and alkalinity:meadow soil>grass chao soil>calcareous soil>swamp soil>purple soil>yellow brown soil>yellow soil>brown soil>rice soil.The effect of parent material on pH value of yellow brown soil:argillaceous rock>carbonate rock>red sandstone;pH value of brown soil with different parent material;limestone>argillaceous rock>quartz sandstone;pH value of red soil with different parent material:argillaceous shale>quartz sandstone>Red sandstone;pH value of yellow soil with different parent material:red sandstone>carbonate rock.