石门县耕地土壤pH值的时空演变特征

Spatial and Temporal Evolution Characteristics of Farmland Soil p H Value of Shimen County

作为耕地重要属性之一,p H值分布及变化情况对耕地质量管理及合理施肥有重要参考作用。通过利用统计分析及地理信息系统空间分析,比较了第二次土壤普查调查和测土配方施肥调查数据,结果表明:石门县2个时期耕地p H值平均值下降了0.5个单位,有42.51%的耕地p H值下降,酸性土壤面积在扩大,呈酸化趋势。不同的土壤类型p H值变化程度不一,潮土与紫色土的缓冲能力最强,而红壤与水稻土的变化程度较大,其中红壤酸性和弱酸性面积分别增加了12.7%和7.3%。

As one of the most important soil properties, distribution and change of pH value can provide important references for farmland quality management and reasonable fertilization. Comparing the data of the second soil survey with soil-testing fertilization by statistical and spatial analysis, the results showed that the area of acidic soil of farmLand was expanded. The average pH value of farmland in Shimen County in two periods of cultivated land decreased by 0.5 units,42.51% farmland appeared pH value decrease, and soil showed acidification. The degree of change of pH value differed from soil types. The purple soil and alluvia soil changed little ,but paddy soil and red soil changed a lot. The areas of acidic and weak acidic red soil increased by 12.7% and 7.3% respectively.