祁连山草地生态系统服务与放牧强度的时空演变特征及其空间耦合关系研究
Spatiotemporal Dynamics and Spatial Coupling between Grassland Ecosystem Services and Grazing Intensity in the Qilian Mountains
刘雅莉 1张燕 1塔文妍 1李耀明 1杜剑卿 2纪宝明1
作者信息
- 1. 北京林业大学草业与草原学院
- 2. 中国科学院大学，北京燕山地球关键带国家野外科学观测研究站;中国科学院大学资源与环境学院
- 折叠
摘要
【目的】放牧活动是高寒草地生态系统最重要的人类干扰方式之一，其强度变化深刻影响生态系统服务功能的时空格局。厘清放牧强度与草地生态系统服务之间的空间关联关系，对高寒草地生态保护与可持续利用具有重要意义。【方法】以祁连山草地生态系统为研究对象，基于2000—2020年多源遥感与统计数据，综合运用InVEST模型评估产水量、土壤保持、生境质量和碳储量4项生态系统服务，刻画其时空演变特征；在此基础上，构建放牧强度时空分布格局，并利用双变量局部空间自相关方法分析放牧强度与生态系统服务的空间耦合关系。【结果】（1）研究期内祁连山草地生态系统服务整体呈持续提升趋势，空间上表现为“中东部高、西部低”；（2）放牧强度呈“先升后降”的阶段性时间特征及“东高西低”的空间格局；（3）空间相关性整体以负相关联占主导，但局部聚集显著，且在部分生态保护区正向关联局部增强。【结论】草地生态系统服务对放牧强度具有显著空间异质性响应，总体呈东部正向响应局部增强、西部负向响应为主的空间梯度特征，且不同服务类型的响应模式存在明显分异。研究结果可为高寒草地分区分级放牧管理和生态政策优化提供科学依据。
Abstract
[Objectives] Grazing is one of the most important human disturbances in alpine grassland ecosystems, and variations in grazing intensity have profound impacts on the spatiotemporal patterns of ecosystem services (ESs). Clarifying the spatial relationship between grazing intensity (GI) and ESs is of great significance for ecological protection and sustainable utilization of alpine grasslands. [Methods] Taking the Qilian Mountains as the study area, this study evaluated four key ESswater yield, soil conservation, habitat quality, and carbon storagefrom 2000 to 2020 using the InVEST model based on multi-source remote sensing and statistical data. The spatiotemporal evolution of GI was characterized, and the spatial coupling relationship between GI and ESs was analyzed using bivariate local indicators of spatial association (LISA). [Results] (1) During the study period, the ESs of grasslands in the Qilian Mountains showed an overall continuous improvement trend, with a spatial pattern of "high in the central and eastern regions, and low in the western regions." (2) Grazing intensity exhibited a phased temporal characteristic of "increasing first and then decreasing," alongside a spatial distribution of "high in the east and low in the west." (3) The spatial correlation was dominated by negative associations overall, but local clustering was significant. Notably, positive correlations were found to be locally enhanced in certain ecological restoration and protection zones. [Conclusions] The response of grassland ESs to grazing intensity shows significant spatial heterogeneity, with distinct differentiation characteristics across different types of services. The results provide a scientific basis for differentiated grazing management and the optimization of ecological policies in alpine grasslands.关键词
祁连山/草地生态系统服务/放牧强度/空间自相关/空间格局Key words
Qilian Mountains/grassland ecosystem services/grazing intensity/spatial autocorrelation/spatial pattern引用本文复制引用
刘雅莉,张燕,塔文妍,李耀明,杜剑卿,纪宝明.祁连山草地生态系统服务与放牧强度的时空演变特征及其空间耦合关系研究[EB/OL].(2026-05-21)[2026-05-23].https://chinaxiv.org/abs/202605.00184.学科分类
环境科学理论/环境管理/环境生物学
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