放牧强度对荒漠草原枯落物-土壤生态化学计量学的影响

doi:10.11733/j.issn.1007-0435.2026.05.023

草地学报 ›› 2026, Vol. 34 ›› Issue (5): 1817-1826.DOI: 10.11733/j.issn.1007-0435.2026.05.023

• 研究论文 • 上一篇

放牧强度对荒漠草原枯落物-土壤生态化学计量学的影响

刘仰乔¹, 张灿浩¹, 杜丽娟¹, 殷欣茹¹, 阿拉坦其其格¹, 康萨如拉^1,2

1. 内蒙古农业大学草业学院, 内蒙古呼和浩特 010020;
2. 内蒙古农业大学植物学国家级实验教学示范中心, 内蒙古呼和浩特 010020

收稿日期:2025-08-06 修回日期:2025-09-24 发布日期:2026-05-08
通讯作者: 康萨如拉，E-mail:srllkang@imau.edu.cn
作者简介:刘仰乔（2000-），男，汉族，吉林吉林人，硕士研究生，主要从事植物生态学研究，E-mail:17644259556@163.com；
基金资助:
内蒙古自治区自然科学基金项目（2025MS03031）资助

Effects of Grazing Intensity on Ecological Stoichiometry in the Litter-Soil System of a Desert Steppe

LIU Yang-qiao¹, ZHANG Can-hao¹, DU Li-juan¹, YIN Xin-ru¹, ALTANQIQIGE¹, KANG Saruul^1,2

1. College of Grassland Science, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010020, China;
2. Key Laboratory of Grassland Resources, National Experimental Teaching Demonstration Center for Botany, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010020, China

Received:2025-08-06 Revised:2025-09-24 Published:2026-05-08

摘要/Abstract

摘要： 本研究以内蒙古中西部短花针茅（Stipa breviflora）荒漠草原为研究对象，基于长期（2004年至今）定位放牧控制试验平台，设置不放牧（Control check，CK）、轻度放牧（Lightly grazing，LG）、中度放牧（Moderately grazing，MG）、重度放牧（Heavy grazing，HG）4种放牧强度梯度，采集枯落物及0~30 cm土壤样品，系统分析其碳（Carbon，C），氮（Nitrogen，N），磷（Phosphorus，P）含量与计量比特征。结果表明，随放牧强度增大，枯落物现存量及其C，N，P含量显著降低，反映出枯落物数量减少与质量劣化。土壤C，N，P含量随放牧强度增大无显著变化。中度和重度放牧强度下，土壤养分的耦合关系减弱，表明过度放牧造成了系统“解耦”。本研究表明，枯落物不仅是放牧影响的直接对象，更是系统养分循环与反馈调控的关键环节，长期高强度放牧会弱化其调控功能并加剧养分限制。研究结果对深入理解荒漠草原生态系统养分循环机制及指导生态恢复管理实践具有重要意义。

关键词: 荒漠草原, 放牧强度, 植物-枯落物-土壤系统, 生态化学计量学

Abstract: This study was conducted in a Stipa breviflora desert steppe in central-western Inner Mongolia. Based on a long-term （since 2004） fixed-site grazing control experiment platform， four gradients of grazing intensities were set up： ungrazed （Control check， CK）， lightly grazing （LG）， moderately grazing （MG）， and heavy grazing （HG）. Litter and soil samples （0-30 cm depth） were collected to systematically analyze the contents and stoichiometric ratio characteristics of carbon （C）， nitrogen （N）， and phosphorus （P）. The results showed that with increasing grazing intensity， the litter standing crop and its C， N， and P contents decreased significantly， reflecting a reduction in both the quantity and quality of litter. In contrast， the contents of C， N， and P in the soil did not change significantly as grazing intensity increased. However， under moderately and heavy grazing intensities， the coupling relationships among soil nutrients weakened， which indicated that overgrazing led to the “decoupling” of the plant-litter-soil system. This study demonstrates that litter is not only a direct target of grazing impacts but also a key link in the system’s nutrient cycling and feedback regulation. Long-term high-intensity grazing may weaken this regulatory role and exacerbate nutrient limitations. These findings provide important scientific insights for the in-depth understanding of nutrient cycling mechanisms in desert steppe ecosystems and the guidance of ecological restoration and management practices.

Key words: Desert steppe, Grazing intensity, Plant-litter-soil system, Ecological stoichiometry

中图分类号:

S812

刘仰乔, 张灿浩, 杜丽娟, 殷欣茹, 阿拉坦其其格, 康萨如拉. 放牧强度对荒漠草原枯落物-土壤生态化学计量学的影响[J]. 草地学报, 2026, 34(5): 1817-1826.

LIU Yang-qiao, ZHANG Can-hao, DU Li-juan, YIN Xin-ru, ALTANQIQIGE, KANG Saruul. Effects of Grazing Intensity on Ecological Stoichiometry in the Litter-Soil System of a Desert Steppe[J]. Acta Agrestia Sinica, 2026, 34(5): 1817-1826.

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放牧强度对荒漠草原枯落物-土壤生态化学计量学的影响

Effects of Grazing Intensity on Ecological Stoichiometry in the Litter-Soil System of a Desert Steppe

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