文献类型：期刊文献

中文题名：青藏高原三江源区高寒草甸土壤氮磷化学计量比对灌丛化的响应及影响因素

英文题名：Soil N∶P Ratio and Its Regulation Factors in Alpine Shrub Encroachment of Alpine Meadow in the Three Rivers Source Region on the Qinghai-Tibetan Plateau

作者：张宇[1,3] 周国英[2] 闫满玉[4] 牛保亮[1] 代永贵[5] 陈永哲[1,3] 陈昊[6] 杜宇皎[6] 聂秀青[1,3]

第一作者：张宇

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,生物多样性保护国家林业和草原局重点实验室,北京100091;[2]中国科学院西北高原生物研究所,藏药研究重点实验室,青海西宁810008;[3]中国林业科学研究院自然保护地研究所,北京100091;[4]河南宝天曼国家级自然保护区管理局,河南内乡474350;[5]西藏芒康县林业和草原局,西藏芒康854500;[6]中国林业科学研究院,北京100091

年份：2025

卷号：38

期号：3

起止页码：103-110

中文期刊名：林业科学研究

外文期刊名：Forest Research

收录：;北大核心:【北大核心2023】；

基金：中央级公益性科研院所基本科研业务费专项资金(CAFYBB2021MA015);青海省国际交流合作项目(2022-HZ-804);国家自然科学基金(32001216)。

语种：中文

中文关键词：土壤N∶P;高寒草甸;灌丛化;青藏高原;调控因素

外文关键词：soil N∶P ratio;alpine meadow;shrub encroachment;Qinghai-Tibetan Plateau;controlling factors

分类号：S714.2

摘要：[目的]在青藏高原高寒草甸灌丛化的背景下,揭示灌丛化是否会改变高寒草甸土壤氮磷化学计量比(N∶P),并揭示灌丛化过程中影响土壤N∶P的调控因素。[方法]在青藏高原的三江源区域的高寒草甸灌丛化区域,选取灌丛斑块、灌丛-草甸斑块、草甸斑块,解析不同土壤深度的N∶P。采用普通最小二乘法、非线性拟合和方差分析等方法探究土壤N∶P的调控因素。[结果]土壤N∶P的变化范围为3.56±0.18到8.30±0.37。灌丛斑块、灌丛-草甸斑块、草甸斑块的N∶P在0~10cm、10~20cm、20~30cm、30~50 cm、50~70 cm、70~100 cm之间均无显著性差别。随着土壤深度的增加,土壤N∶P均呈现降低的趋势。土壤理化特性和微生物特性是决定土壤N∶P的重要因素。随着微生物生物量碳、氮和磷的增加,土壤N∶P呈显著的增加趋势。土壤氮、土壤温度与土壤N∶P之间存在显著的正相关关系;而土壤密度、土壤p H与土壤N∶P之间存在显著的负相关关系。土壤湿度对土壤N∶P的解释量较低。土壤磷对土壤N∶P的影响不显著。方差分析的结果显示,土壤理化特性和微生物因素可以解释土壤N∶P总变异的85.49%,其中二者共同组合的解释量最高,占53.25%,土壤理化特性的单独解释量次之为33.97%。[结论]青藏高原三江源地区高寒草甸土壤灌丛化并未显著改变不同深度土壤的N∶P,土壤N∶P受到土壤微生物与土壤理化特性的共同作用,这有助于深入理解中高海拔区域陆地生态系统的土壤养分循环动态。
[Objective]In the scenario of shrub encroachment of alpine meadow on the Qinghai-Tibetan Plateau,this study aims to explore whether shrub encroachment in alpine meadows on the Qinghai-Tibetan Plateau changes the soil nitrogen and phosphorus stoichiometric ratio(N∶P),and to reveal the regulatory factors affecting the soil N∶P ratio.[Method]In the shrub encroachment areas of alpine meadows in the Three Rivers Source Region on the Qinghai-Tibetan Plateau,we selected shrub patches,shrubmeadow patches,and meadow patches to analyze the N∶P ratio at different soil depths.Ordinary least squares,nonlinear regression,and variance analysis methods were applied to explore the factors regulating the soil N∶P ratio.[Result]The soil N∶P ratio ranged from 4.25±0.13 to 8.30±0.37.There was no significant difference in the N∶P ratios of shrub patches,shrub-meadow patches,and meadow patches.But soil N∶P ratio decreased with increasing soil depth(0~10 cm,10~20 cm,20~30 cm,30~50 cm,50~70 cm,70~100 cm).Soil physical and chemical properties and microbial properties were found to be key factors determining the soil N∶P ratio.With the increase of microbial biomass carbon,nitrogen,and phosphorus,the soil N∶P ratio showed a significant increasing trend.There were significant positive correlations between soil nitrogen,soil temperature,and soil N∶P ratio.Conversely,significant negative correlations were observed between soil bulk density,soil pH,and soil N∶P ratio.Soil moisture had a lower explanatory power for the soil N∶P ratio.Soil phosphorus did not significantly alter the soil N∶P ratio.Variance analysis results indicated that soil factors and microbial factors together could explain 85.49%of the total variation of the soil N∶P ratio,with the combined explanatory power of both factors being the highest at 53.25%,followed by the independent explanation of soil physicochemical properties at 33.97%.[Conclusions]Shrub encroachment of alpine meadows in the Three Rivers Source Region on the Qinghai-Tibetan Plateau does not significantly alter the soil N∶P ratio at different depths.The soil N∶P ratio is jointly influenced by soil microbial and physicochemical properties.This provides insights into the dynamics of soil nutrient cycling in high-altitude terrestrial ecosystems.