生态环境学报2024，Vol.33Issue(7)：1117-1129,13.DOI:10.16258/j.cnki.1674-5906.2024.07.013
甘肃河东地区坡度对生态系统服务的影响及其阈值效应
Impact of the Slope on Ecosystem Services in Hedong District of Gansu Province,China
摘要
Abstract
The ecosystem services,as an effective intermediary tool for transforming ecosystem functions into human wellbeing,are of great significance in studying their importance for human activities.As a major topographical feature of a given terrain,the slope has a substantial impact on the value of ecosystem services,and significantly influences ecosystem service functions,such as regional water production services and soil conservation.In this study,we used the InVEST model to measure three typical ecosystem services—the water yield,carbon storage,and soil conservation in Hedong District of Gansu Province,China from 1995 to 2020.We investigated the effects of the slope on these services and their hierarchy of importance,and quantitatively identified the impact threshold of the slope on ecosystem service functions.Compared with previous studies on ecosystem services based on topographical gradients,this study more comprehensively and clearly reflects the changing characteristics of various ecosystem services with slope.The results show that 1)water yield and soil conservation in Hedong District initially increased and then decreased,followed by a subsequent increase from 1995 to 2020,while carbon storage decreased during this period.All three typical ecosystem services generally had a lower concentration in the Longzhong Plateau and Longdong Plateau,and a higher concentration in the Longnan Mountainous and Gannan Plateau.2)Water yield and carbon storage in the study area initially increased with the slope,followed by a gradual decrease,and reached their peak values at slope level Ⅷ(25°-35°).By contrast,soil conservation in the study area continually increased with the slope,and reached its peak at slope level Ⅸ(>35°).3)General areas and areas of general importance were the dominant regions at low slope levels,while moderately and highly important areas were dominant at medium to high slope levels.Once the slope exceeded the maximum threshold,the impact of slope on ecosystem services weakened.4)The thresholds for the impact of the slope on ecosystem services in the general,generally important,moderately important,and highly important areas were 17.2°,9.6°,11.9°,and 20.5°,respectively.The study provides important references for optimizing and regulating land consolidation projects in the future.关键词
生态系统服务/InVEST模型/时空演变/坡度/阈值效应/甘肃河东地区Key words
ecosystem services/InVEST model/spatiotemporal evolution/slope/threshold effect/Hedong District,Gansu Province分类
资源环境引用本文复制引用
王雯,侯青青,裴婷婷..甘肃河东地区坡度对生态系统服务的影响及其阈值效应[J].生态环境学报,2024,33(7):1117-1129,13.基金项目
甘肃省自然资源规划研究院外协项目(GSAU-JSFW-2023-78) （GSAU-JSFW-2023-78）
国家自然科学基金项目(42361017) （42361017）
