水土保持研究2025，Vol.32Issue(6)：141-150,10.DOI:10.13869/j.cnki.rswc.2025.06.019
土壤养分异质性对荒漠草原微斑块植物群落特征的影响
Effects of soil nutrient heterogeneity on plant community characteristics in micro-patches of desert steppe
摘要
Abstract
[Objective]Soil resource heterogeneity can affect plant growth by increasing available ecological niche space and enhancing the complexity of habitat resource structure.This study aims to explore the effects of soil nutrient heterogeneity on plant community characteristics,providing a theoretical basis and scientific guidance for ecosystem management in desert steppe.[Methods]Leveraging natural variations in native soil nutrients,this study artificially constructed soil patches with different nutrient conditions but uniform distribution patterns.It investigated the effects of these nutrient differences on community structure,functional group composition,diversity,and soil physicochemical properties in desert steppe.[Results]In the first experimental year,soil nutrients significantly affected plant height,coverage,and density(p＜0.05).By the third year,plant height was significantly increased(p＜0.05).Both the year and soil patch nutrient characteristics significantly affected plant community composition.During the experimental years,dominant species shifted from annuals to perennials,with importance values decreasing by 0～57.78％(p＜0.05).All α-diversity indices showed a trend of initial increase followed by decrease with rising soil patch nutrient levels.By the third year,the Richness index increased by 45.0％,96.4％,157.1％,and 165.1％,respectively,compared to the first year.Soil bulk density,electrical conductivity,and pH showed significant negative correlations with only some α-diversity indices(p＜0.05),while total phosphorus,total nitrogen,and soil moisture were negatively correlated with all α-diversity indices.Partial least squares path modeling revealed that soil nutrient heterogeneity could directly reduce diversity by significantly lowering total nitrogen and phosphorus contents(p＜0.05),and indirectly suppress diversity through plant density.[Conclusion]The ecological memory effect of soil heterogeneity may continuously play a dominant role in the pathways for community assembly.This occurs mainly through direct suppression of total nutrients,and a cascade path of"heterogeneity-nutrient-density"interactions,leading to a significant reduction in plant diversity.Community succession exhibited a pattern of"convergence-divergence-reorganization",with dominant species transitioning from annual and biennial plants to perennial rhizomatous grasses.This study suggests regulating spatial distribution of soil nutrients to enhance diversity conservation.关键词
土壤养分异质性/植物多样性/土壤斑块/植物—土壤互作/土壤理化性质Key words
soil nutrient heterogeneity/plant diversity/soil patches/plant-soil interaction/soil physicochemical properties分类
农业科技引用本文复制引用
兰慧琴,刘建康,王益涛,黄祥祥,张洁,张程辉,白存琳,牛向雯..土壤养分异质性对荒漠草原微斑块植物群落特征的影响[J].水土保持研究,2025,32(6):141-150,10.基金项目
国家自然科学基金项目(32360280 （）
32001117) （）
2023年自治区全职引进高层次人才科研启动项目(2023BSB03022) （2023BSB03022）
2022年第七批自治区青年科技人才托举工程 （）
