基于改进地形分布指数的耕地土壤属性空间变异特性研究  

Study on Spatial Variation Characteristics of Cultivated Land Soil Attributes Based on Improved Topographic Distribution Index

作　　者：周琪清 赵小敏[1] 郭熙[1] 曾学亮 ZHOU Qiqing;ZHAO Xiaomin;GUO Xi;ZENG Xueliang(Key Laboratory of Agricultural Resources and Ecology in Poyang Lake Watershed of Ministry of Agriculture and Rural Affairs in China,Academy of Land Resource and Environment,Jiangxi Agricultural University,Nanchang,Jiangxi 330045)

机构地区：[1]江西农业大学国土资源与环境学院,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：《核农学报》2024年第8期1595-1604,共10页Journal of Nuclear Agricultural Sciences

基　　金：国家重点研发计划项目(2020YFD1100603);国家自然科学基金项目(41361049)。

摘　　要：为解决现有地形位指数和地形位置指数因忽视地物在空间上的规律变化而造成的误差累积、异常值等问题,本研究基于地理学第一定律对地形分布指数模型进行加权修正,并利用改进后的地形位置指数进行半自动地形分类,从定性、定量角度分析地形因子对耕地土壤属性空间变异的影响特性。结果表明,改进后的地形分布指数可显著改善现有地形指数的多峰与偏态问题;在与土壤有机质、速效钾含量的相关性分析中,改进地形分布指数普遍优于传统地形指数,其中与土壤有机质、速效钾含量相关性最高的指数分别是TPI_IDW(0.367)、TPI_RBF(0.277);与地形位置指数相比,基于改进地形位置指数的地形分类对细部信息的刻画更符合实际。研究区土壤有机质含量表现为中坡>下坡>山谷>山脊>平坡,速效钾含量表现为山脊>山谷>平坡>下坡>中坡。综上,改进地形分布指数具有一定的科学合理性。本研究结果为地形分类等其他相关领域研究提供了新思路。To solve the problems of error accumulation and abnormal values caused by ignoring the spatially regular changes of terrain features in existing terrain niche index(TNI)and topographic position index(TPI),this study modified the topographic distribution index model based on the first law of geography and used the improved topographic position index for semi-automatic terrain classification.The study analyzed the spatial variation characteristics of terrain factors on soil property in a quantitative and qualitative manner.The results showed that the improved topographic distribution index could significantly improve the multi-peak and skewness problems of the existing terrain index.In the correlation analysis with soil organic matter and available potassium content,the improved topographic distribution index generally outperformed traditional terrain index,with the highest correlation index being TPI_IDW(0.367**)and TPI_RBF(0.277**).Compared with terrain classification based on the improved topographic position index,terrain classification based on the traditional topographic position index provided a more realistic depiction of fine-scale information.The soil organic matter content in the study area showed a pattern of middle slope>lower slope>valley>ridge>flats slope,while the available potassium content showed a pattern of ridge>valley>flats slope>lower slope>middle slope.In summary,the improved topographic distribution index has a certain scientific rationality.The results of this study provide new idea for other related field studies,such as terrain classification.

关 键 词：土壤属性 地形位指数 地形位置指数 地理学第一定律 地形分类 

分 类 号：S158.3[农业科学—土壤学]