文献类型：期刊文献

中文题名：青藏高原高寒草甸土壤微生物碳氮磷及化学计量对灌丛化的响应及影响因素分析

英文题名：Soil Microbial Biomass Carbon,Nitrogen,Phosphorus and Their Stoichiometric Characteristics in Alpine Meadow Shrubification in the Qinghai-Tibetan Plateau

作者：牛保亮[1] 周国英[2] 吴琼[3] 黄琅[4] 平才吉[5] 包成泰[6] 陈永哲[1] 聂秀青[1]

第一作者：牛保亮

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,国家林业和草原局森林生态环境重点实验室,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林业研究所,北京100091;[4]中国林业科学研究院热带林业实验中心,广西532600;[5]河南蒙古族自治县农牧水利综合服务中心,青海黄南藏族自治州811500;[6]互助土族自治县实验林场,青海海东810500

年份：2025

卷号：56

期号：6

起止页码：1601-1609

中文期刊名：土壤通报

外文期刊名：Chinese Journal of Soil Science

收录：;北大核心:【北大核心2023】；

基金：中国林业科学研究院基本科研业务费专项(CAFYBB2021MA015);国家自然科学基金(32001216,31930078)。

语种：中文

中文关键词：青藏高原;灌丛化;高寒草甸;微生物生物量;微生物化学计量

外文关键词：Qinghai-Tibet Plateau;Alpine meadow shrubification;Alpine meadow;Soil microbial biomass;Soil microbial biomass stoichiometry

分类号：S714.2

摘要：【目的】本研究旨在明晰青藏高原高寒草甸灌丛化的过程中,土壤微生物生物量与化学计量的变化特征及其影响因素。【方法】在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0~100 cm土壤深度的微生物生物量碳(MBC)、微生物生物量氮(MBN)、微生物生物量磷(MBP)与其化学计量。采用卡方参数检验、普通最小二乘法和方差分解等方法研究不同斑块下MBC、MBN、MBP及其化学计量,解析其调控因素。【结果】随着土壤深度的增加,MBC和MBN呈降低趋势。MBP、MBC∶MBN、MBC∶MBP、MBN∶MBP随土壤深度的增加并未呈现明确的变化规律。随着土壤有机碳、易分解有机碳I、易分解有机碳II、难分解有机碳、土壤全氮、土壤全磷、土壤温度和土壤湿度的增加,MBC和MBN均呈显著增加的趋势;而MBP仅与土壤有机碳、易分解有机碳II、难分解有机碳、土壤全氮之间呈显著的正相关关系;随土壤pH和土壤容重的增加,MBC、MBN和MBP呈显著的降低趋势。【结论】土壤物理特征和化学特性可以显著地影响MBC、MBN和MBP而对其化学计量特征的影响相对较弱。
[Objective]This study aimed to make sure the characteristics of soil microbial biomass and its stoichiometry in the process of alpine meadow shrubification in the Qinghai-Tibet Plateau.[Method]The shrub patches,shrub-grassland patches and grassland patches were selected in the alpine meadow shrubification area of the Three Rivers Source Region in the Qinghai-Tibet Plateau,and the microbial biomass carbon(MBC),microbial biomass nitrogen(MBN),microbial biomass phosphorus(MBP)were analyzed at soil depths of 0~100 cm.Chi-square tests,ordinary least squares methods,and variance decomposition methods were used to study the MBC,MBN,MBP,and their stoichiometry under different patches,and to analyze their regulatory factors.[Result]Among them,with the increase of soil depth,MBC and MBN showed a decreasing trend.There was no clear change pattern in MBP,MBC∶MBN,MBC∶MBP,and MBN∶MBP among shrub patches,shrub-grassland patches,and grassland patches.With the increase of soil organic carbon,easily decomposable organic carbon I,easily decomposable organic carbon II,difficultly decomposable organic carbon,soil total nitrogen,soil total phosphorus,soil temperature,and soil humidity,MBC and MBN showed a significant increasing trend;while with the increase of soil pH and soil bulk density.MBC and MBN showed a decreasing trend.MBP was a significantly positive correlation with soil organic carbon,easily decomposable organic carbon II,difficultly decomposable organic carbon,and total nitrogen,while it had a significantly negative relationship with soil pH and soil bulk density.[Conclusions]Soil physical and chemical properties can significantly affect MBC,MBN and MBP,while their influence on the stoichiometric characteristics is relatively weak.