南昌市近郊耕层土壤有机质空间格局及其影响因素分析  

Spatial Pattern of Soil Organic Matter in the Suburbs of Nanchang City and Its Influencing Factors

作　　者：黎钰鑫 赵小敏[1,2] 郭熙 赵丽红[1] LI Yuxin;ZHAO Xiaomin;GUO Xi;ZHAO Lihong(College of Land Resources and Environment,Jiangxi Agricultural University,Nanchang 330045,China;Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs,Nanchang 330045,China)

机构地区：[1]江西农业大学国土资源与环境学院,江西南昌330045 [2]农业农村部鄱阳湖流域农业资源与生态重点实验室,江西南昌330045

出　　处：《江西农业大学学报》2023年第3期749-758,共10页Acta Agriculturae Universitatis Jiangxiensis

基　　金：国家重点研发计划项目子课题(2020YFD1100603-02)。

摘　　要：[目的]土壤有机质(SOM)含量是土壤肥力表征的重要指标之一,影响土壤结构、植物营养和土壤微生物活性,以及粮食的持续生产。随着城市发展,近郊耕地是最直接灭失的地方。因此分析近郊耕地土壤有机质空间格局及其影响因素,有利于认识近郊耕地土壤有机质分布规律并合理布局农业生产,保护耕地。[方法]基于SPSS对南昌市近郊430个耕地样点数据进行描述性统计分析土壤有机质含量基本情况,运用GS+9.0软件对耕地土壤有机质进行半方差分析选择最优拟合函数,运用ArcGIS进行克里金插值研究南昌市近郊耕地土壤有机质空间布局,并利用地理探测器中因子探测和交互作用分析空间变异主导因素和各因子间交互作用对耕地土壤有机质空间变异的影响。[结果](1)南昌市近郊耕地土壤有机质平均值为26.658 g/kg,变异系数(CV)为46.64%,空间变异中等。指数(Exponential)模型为半变异函数最佳拟合,块金系数为0.549,为中等程度的空间自相关。在82.92 km范围内,土壤有机质具有相关性,整体呈现东西高,东北向西南向偏低的空间格局。(2)南昌市近郊耕地土壤有机质含量空间格局影响较强的单因子降序排列:年均降水量、排水能力、灌溉保证率、年均温、土壤类型、交通通达度、高程、归一化植被指数(NDVI);(3)影响土壤有机质空间格局较强的前5组交互因子为:年均温∩中心城市影响度,排水能力∩年降水,年均温∩交通通达度,年降水∩灌溉保证率,年降水∩中心城市影响度。耕层土壤有机质空间格局是由多种因子共同作用推进的,因子间的交互作用为双因子增强和非线性协同提高。[结论]南昌市近郊耕地土壤有机质总体较好,空间分异性较强。[Objective]Soil organic matter(SOM)content is one of the important indicators of soil fertility characterization,which affects soil structure,plant nutrition and soil microbial activity.Moreover,it has crucial influence on the sustainable production of food.With the development of the city,the suburban cultivated land is the most direct loss.Therefore,analyzing the spatial pattern of soil organic matter in peri-urban arable land and its influencing factors is conducive to understanding the distribution pattern of soil organic matter in suburban arable land and rationalizing the layout of agricultural production to protect arable land.[Method]Firstly,based on 430 cultivated land sample data in the suburb of Nanchang City,the basic soil organic matter content was analyzed by SPSS.Secondly,GS+9.0 software was used to select the best-fit function for soil organic matter in arable land by semi-analysis of variance.Thirdly,kriging interpolation by ARCGIS was used to get the spatial layout of soil organic matter in arable land in suburban Nanchang.Finally,the effects of dominant factors of spatial variation and interaction between factors on spatial variation of soil organic matter in cultivated land were analyzed by factor detection and interaction in geographical detector.[Result](1)The mean value of soil organic matter in suburban arable land in Nanchang City was 26.658 g/kg,and the coefficient of variation was 46.64%,which indicated that it was medium spatial variability.The exponential model was the best fit function for the semi-variance function.In addition,the block gold coefficient was 0.549,which was a moderate spatial autocorrelation.Furthermore,within 82.92 km,soil organic matter was correlated,showing an overall spatial pattern which was high from east to west and low from northeast to southwest;(2)The descending order of the factors that had strong influence on the spatial pattern of soil organic matter content in the cultivated land in the suburbs of Nanchang City was:annual average precipitation,drainage

关 键 词：近郊耕地 土壤有机质 空间变异性 地理探测器 交互作用 南昌市 

分 类 号：S153.6[农业科学—土壤学]