陇川县甘蔗土壤pH值时空变化特征及影响因素

Spatio-temporal Variation Characteristics and Influencing Factors of pH of Sugarcane Field Soil in Longchuan County

通过统计2007年和2020年陇川县甘蔗种植区土壤pH值数据,应用全局Moran’s I指数、冷热点分析、半方差函数和克里金插值等方法对蔗区土壤pH值的时空变化特征及影响因素进行研究,结果表明,2007—2020年蔗区土壤总体呈快速酸化趋势,pH值下降了0.38个单位,降幅达7.54%,与非甘蔗种植区相比,显著下降了1.03个单位。研究区中部和西南部土壤pH值下降显著,在土壤类型上红壤、水稻土和赤红壤的pH值显著下降,降幅分别为10.94%、9.98%和3.83%。在成土母质上第四纪冲积物土壤pH值降幅最大,达0.52个单位。蔗区土壤pH值时空变异主要受人为因素和自然条件的综合影响,人为因素对土壤pH值的变化具有主导作用。

Based on the pH of sugarcane field soil in 2007 and 2020 in Longchuan County,the spatio-temporal variation characteristics and influencing factors of pH were studied by global Moran's I index,cold and hot spot analysis,semi-variance function and Kriging interpolation.The results showed that the sugarcane field soil tended to acidified rapidly in general from 2007 to 2020,pH value decreased by 0.38 units,or 7.54%,compared with non-sugarcane planting area,it decreased significantly by 1.03 units.pH decreased observably in the central and southwest of the study area.The pH of red soil,paddy soil and lateritic red soil decreased significantly by 10.94%,9.98% and 3.83%,respectively.From the parent material,the pH of quaternary alluvial soil decreased the most,reaching 0.52 units.The temporal and spatial variation of pH of sugarcane field soil was mainly influenced by human factors and natural conditions,and human factors played a leading role in the variation of pH.