高原山区茶园土壤pH和重金属铬的空间异质性研究——以贵州省贵定县为例  

Spatial Heterogeneity of Soil pH and Chromium Content in Tea Plantations in Plateau Mountainous Areas:a Case Study of Guiding County,Guizhou Province

作　　者：王宗磊 徐颖[1] 李作为 文锡梅 朱栋 湛天丽 WANG Zonglei;XU Ying;LI Zuowei;WEN Ximei;ZHU Dong;ZHAN Tianli(Guizhou First Institute of Surveying and Mapping,Guiyang 550003,China;Guizhou Institute of Mountain Resources,Guiyang 550001,China;Guizhou Environmental and Engineering Appraisal Center,Guiyang 550003,China)

机构地区：[1]贵州省第一测绘院,贵州贵阳550003 [2]贵州省山地资源研究所,贵州贵阳550001 [3]贵州省环境工程评估中心,贵州贵阳550003

出　　处：《云南农业大学学报（自然科学版）》2024年第4期159-165,共7页Journal of Yunnan Agricultural University:Natural Science

基　　金：贵州省成果转化项目(黔科合成果[2024]一般102);贵州科学院青年基金项目(黔科院J字[2020]17号)。

摘　　要：【目的】探究高原山区茶园土壤pH及重金属铬(chromium,Cr)含量的空间异质性及其驱动因素,为茶树高产优质栽培提供科学依据。【方法】采集贵州省贵定县423个茶园土壤样品,采用地统计学和半方差函数模型法探究茶园土壤pH和Cr的空间异质性,并利用随机森林算法研究不同pH下Cr含量变化的驱动因素。【结果】高原山区茶园土壤pH值为4.5~6.0的样品占74%,适宜茶树生长。研究区域内土壤Cr含量处于安全水平。土壤pH值自西南向东北逐渐减小,呈明显的带状分布。土壤重金属Cr含量的空间分布呈现自北向东南逐渐降低的趋势,低值斑块多出现在东南区域,高值斑块集中在中西部。【结论】不同土壤pH值对Cr含量的影响不同。在pH≤5.5的茶园土壤中,土壤pH对Cr含量影响最大;在5.5<pH≤6.5的茶园土壤中,土壤颗粒对Cr含量影响最大。[Purpose]To investigate the spatial heterogeneity and driving factors of soil pH and heavy metal chromium(Cr)content in tea plantations in plateau mountainous areas,providing a scientific basis for high-yield and high-quality tea cultivation.[Methods]Soil samples from 423 tea plantations in Guiding County,Guizhou Province were collected.Geostatistics and semivariance function models were used to explore the spatial heterogeneity of soil pH and Cr in the tea plantations.Random forest algorithm was used to study the driving factors of Cr content variations under different pH conditions.[Results]74%of soil samples in plateau mountainous tea plantations had a pH value between 4.5 and 6.0,suitable for tea cultivation.The Cr content in the soil was within safe levels.The soil pH value decreased gradually from southwest to northeast,showing a clear zonal distribution.The spatial distribution of soil heavy metal Cr decreased gradually from north to southeast,with low-value patches mostly appearing in the southeast and high-value patches concentrated in the central-western region.[Conclusion]Different soil pH values have varying impacts on Cr content.In tea plantation soils with pH≤5.5,soil pH has the greatest impact on Cr content;in soils with 5.5<pH≤6.5,soil particles have the greatest impact on Cr content.

关 键 词：茶园 土壤 pH 重金属 铬 

分 类 号：S153.61[农业科学—土壤学]