Changes of Trade-offs Between Aboveground and Belowground Plant Biomass Across Different Grazing Intensities of Alpine Meadow

doi:10.11733/j.issn.1007-0435.2025.08.018

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (8): 2575-2584.DOI: 10.11733/j.issn.1007-0435.2025.08.018

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Changes of Trade-offs Between Aboveground and Belowground Plant Biomass Across Different Grazing Intensities of Alpine Meadow

DUAN Jun-guang¹, FANG Kai¹, PEI Lu², CHU Jian-min¹, ZHANG Jin-xin², LI Xiao-xia², WANG Ying-xin²

1. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
2. Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China

Received:2025-04-02 Revised:2025-05-19 Online:2025-08-15 Published:2025-08-27

高寒草甸不同放牧强度下植物地上-地下生物量权衡的变化

段俊光¹, 房凯¹, 裴渌², 褚建民¹, 张金鑫², 李晓霞², 王迎新²

1. 中国林业科学研究院林业研究所, 北京 100091;
2. 中国林业科学研究院生态保护与修复研究所/国家林业和草原局草原研究中心, 北京 100091

通讯作者: 王迎新, E-mail:wyxcaf@163.com
作者简介:#段俊光(2000-),男,汉族,湖南岳阳人,硕士研究生,主要从事退化草地修复研究,E-mail:DUANJG2000@163.com;房凯(1991-),男,汉族,山东德州人,博士,助理研究员,主要从事土壤生态学研究,E-mail:fangkai@caf.ac.cn
基金资助:
中央级公益性科研院所基本科研业务费专项资金（CAFYBB2024MA010， CAFYBB2020ZB001， CAFYBB2023ZA009-03， CAFYBB2022XA002）；中国科学院战略性先导科技专项（A类）（XDA26020102）资助

Abstract

Abstract: In recent decades， the exacerbation of overgrazing has posed substantial threats to the stability of alpine meadow ecosystems. Understanding the trade-offs between aboveground and belowground biomass allocation under different grazing intensities， as well as identifying the driving factors behind these patterns， is critical for ecological conservation and restoration initiatives in alpine meadows. This study centered on alpine meadow ecosystems in Hongyuan County on the Tibetan Plateau， which were subjected to four distinct grazing intensity treatments： ungrazed， lightly grazed， moderately grazed， and heavily grazed. Through meticulous measurement of plant aboveground and belowground biomass， and analysis of soil physicochemical properties， we investigated the changes and driving factors behind biomass allocation under different grazing intensities. The results demonstrated that under ungrazed treatment， biomass allocation was skewed towards the belowground. However， as the grazing intensity increased， there was a progressive shift towards aboveground biomass， resulting in a decrease in the trade-off index. Plant height， plant species richness， soil total carbon， and soil total nitrogen content showed significant positive correlations with the biomass trade-off， whereas soil carbon-nitrogen ratio （C∶N） and soil bulk density were significantly and negatively correlated with the biomass trade-off. Variance partitioning analysis revealed that under light grazing conditions， plant characteristics were the primary drivers of biomass allocation trade-offs. Nevertheless， as the grazing intensity increased to moderate and heavy levels， soil factors became more influential. Consequently， management practices aimed at the restoration of degraded alpine meadows should be tailored specifically according to grazing intensity. This involves adjusting vegetation management strategies and implementing targeted measures to restore soil nutrients and effectively promote ecosystem restoration.

Key words: Alpine meadow, Grazing intensity, Biomass trade-off, Plant traits, Soil nutrients

摘要： 近年来草地过度放牧现象日益加剧，对高寒草甸生态系统的稳定性造成严重威胁。明确不同放牧强度下植物地上-地下生物量的权衡关系及其驱动因素，对高寒草甸生态保护与恢复具有重要意义。本研究以青藏高原红原县无放牧、轻度、中度和重度放牧的高寒草甸为对象，通过测定植物地上与地下生物量及土壤理化性质，探究不同放牧强度下植物生物量分配的权衡变化及其驱动因素。结果显示：无放牧草地生物量向地下权衡，随放牧强度增加，生物量逐渐向地上倾斜，权衡值降低。生物量权衡与植物株高、物种丰富度、土壤全碳及全氮含量呈显著正相关关系，与土壤碳氮比、容重呈显著负相关关系。方差分解表明，轻度放牧阶段植物特性是主要驱动因素，中度和重度放牧阶段土壤因素的作用更明显。因此，在退化高寒草甸的管理实践中，应根据放牧强度的差异，针对性地调整植被管理策略和土壤养分恢复措施，以实现生态系统的有效恢复。

关键词: 高寒草甸, 放牧强度, 生物量权衡, 植物特性, 土壤养分

CLC Number:

S812

DUAN Jun-guang, FANG Kai, PEI Lu, CHU Jian-min, ZHANG Jin-xin, LI Xiao-xia, WANG Ying-xin. Changes of Trade-offs Between Aboveground and Belowground Plant Biomass Across Different Grazing Intensities of Alpine Meadow[J]. Acta Agrestia Sinica, 2025, 33(8): 2575-2584.

段俊光, 房凯, 裴渌, 褚建民, 张金鑫, 李晓霞, 王迎新. 高寒草甸不同放牧强度下植物地上-地下生物量权衡的变化[J]. 草地学报, 2025, 33(8): 2575-2584.

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Changes of Trade-offs Between Aboveground and Belowground Plant Biomass Across Different Grazing Intensities of Alpine Meadow

高寒草甸不同放牧强度下植物地上-地下生物量权衡的变化

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