摘要
Abstract
To research the interaction between nutrient cycling and soil bacteria in the growth of tea at different depths of soil surface,rock,soil,and tea samples are collected from Dazhai Ancient Tea Garden in Lincang City,Yunnan Province.The soil bacterial community and nutrient elements content are measured by using Illumina high-throughput sequencing technology and ICP-AES geochemical analysis method.The results indicate that firstly P,K,Ca,Mg,and Na in the surface soil of Yunnan ancient tea gardens are relatively lacking compared to the background values.The order of migration and enrichment ability of soil nutrients is K＞Fe＞Mn＞Mg＞P＞Ca＞S＞Cu＞Na,where the migration and enrichment coefficients of K and Fe are greater than 1.The ranking of the bioaccumulation coefficients of tea is Ca＞P＞Mn＞K＞Na＞Cu＞Mg＞S＞Al＞Fe.The coefficients of Ca,P,Mn,and K are greater than 1,indicating their accumulation in tea and increasing with soil depth.Secondly,the dominant groups in D1-D6 deep soil are Acidobacteria,Proteobacteria,and Chlorobacteria.The relative abundance of Proteobacteria,Pseudomonas,and Actinobacteria decreases with increasing soil depth,while the relative abundance of phylum Nitrospira increases with soil depth.Thirdly,the positive feedback effect between K,Fe,Cu,Na,P,Mn,and S during the weathering stage and soil microbial community promotes the growth of tea,while the negative correlation of them shown during the tea growth stage is related to the metabolic process of tea tree growth.关键词
元素迁移/土壤细菌/古茶园/循环响应Key words
element migration,soil bacteria,ancient tea gardens/cyclic response
