引用本文:张子璐,左昕弘,刘 峰,石孝均.渝西丘陵区土壤速效钾空间异质性及影响因素[J].土壤学报,2020,57(2):307-315. DOI:10.11766/trxb201902250030
ZHANG Zilu,ZUO Xinhong,LIU Feng,SHI Xiaojun.Spatial Heterogeneity of Soil Readily Available Potassium and Its Influencing Factors in Western Chongqing Hilly Area, China[J].Acta Pedologica Sinica,2020,57(2):307-315. DOI:10.11766/trxb201902250030
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渝西丘陵区土壤速效钾空间异质性及影响因素
张子璐, 左昕弘, 刘 峰, 石孝均
西南大学资源环境学院
摘要:
土壤养分空间分布规律的研究对于土壤养分分区管理、基本农田建设等有重要意义。以渝西丘陵区的潼南国家农业科技园核心区为研究对象,结合普通克里格法和聚类分析法对研究区土壤速效钾(Readily available potassium,AK)的水平和垂直空间异质性进行研究。结果表明,(1)0~20、20~40和40~60 cm土层AK平均含量分别为111.6、96.1和90.2 mg·kg-1,为中等-缺乏水平;各土层变异系数均属中等变异。(2)0~20和20~40 cm土层AK的全局莫兰指数(Global Moran’s I)均为负值,存在空间孤立;40~60 cm为正值,存在空间集聚。(3)0~20和20~40 cm土层最优模型为高斯模型,40~60 cm土层为球形模型。0~20和40~60 cm土层AK空间变异以随机因素变异为主,20~40 cm土层是结构因素和随机因素共同造成的。(4)0~20 cm土层AK高值区集中于研究区中部,低值区分布较为随机。20~40和40~60 cm土层AK分布趋势相似,高值区集中于东南部,低值区集中于东北部。AK垂直空间分布表现为三种类型,其面积由大到小依次为均匀型、低钾递减型、高钾递减型。土壤类型、地形地貌和土地利用类型对AK含量的空间分布存在一定影响,且在水平和垂直空间上影响程度不同。研究结果为研究区基本农田建设的土地整治选址、方案优化和整治后养分分区管理提供了科学依据。
关键词:  土壤速效钾  空间异质性  空间插值  聚类分析
基金项目:国家科技支撑计划项目课题(2015BAD06B04)资助
Spatial Heterogeneity of Soil Readily Available Potassium and Its Influencing Factors in Western Chongqing Hilly Area, China
ZHANG Zilu, ZUO Xinhong, LIU Feng, SHI Xiaojun
College of Resources and Environment, Southwest University
Abstract:
【Objective】The study on rules of spatial distribution of soil nutrients is of important significance to regionalized management of soil nutrients and construction of primary farmlands. 【Method】Using the common ordinary Kriging method and cluster analysis method in combination, horizontal and vertical spatial distribution of soil readily available potassium (AK) in the farmlands was studied and characterized in the core region of the Tongnan National Agricultural Science and Technology Park in West Chongqing.【Result】(1) Results show that the AK in the soil layers of 0~20, 20~40 and 40~60 cm averaged to be 111.6, 96.1 and 90.2 mg·kg-1, in content respectively, and varied in a moderate degree and in the range of medium ~ deficiency in grade;. (2) The AKs in the 0~20 and 20~40 cm soil layers were both negative in global Moran""s I and spatially isolated, while the AK in the 40~60 cm soil layer was positive and spatially agglomerated; (3) Distribution of the AKs in the 0~20 and 20~40 cm soil layer could be best described with the Gaussian model, and in the 40~60 cm soil layer with the spherical model. The AKs in the 0~20 and 40~60 cm soil layers varied spatially mainly with random factors, and in the 20~40 cm soil layer with structural factors and random factors jointly; (4) The 0~20 cm soil layer high in AK concentrated in the center of the study area, while the layer low in AK scattered quite randomly. The AK in the 20~40 and 40~60 cm soil layers followed a similar trend in distribution. The layers high in AK concentrated in the southeast part and the layers low in AK in the northeast part of the studied region. Vertical distribution of the AK appeared to be in three forms, i.e. uniform, low AK declining and high AK declining, which exhibited a decreasing order in area. 【Conclusion】Soil type, topography and land use are the importment factors that have certain impacts that vary in degree either vertically or horizontally on the spatial distribution of AK contents. All the findings of the study may serve as a scientific basis for selection of land consolidation sites, program optimization and regionalized nutrient management of the consolidatedd land in the study area.
Key words:  Soil readily available potassium  Spatial heterogeneity  Spatial interpolation analysis  Cluster analysis