中国农村水利水电Issue(5)：1-9,17,10.DOI:10.12396/znsd.2500852
长江中下游水生态系统物理完整性对人类活动强度的阈值响应研究
Threshold Response of Yangtze River Mid-Lower Reach Aquatic Physical Integrity to Human Activity Intensity
摘要
Abstract
Current assessments of aquatic ecosystem health in the middle and lower Yangtze River largely focus on single-factor indicators,limiting their ability to capture cumulative disturbance effects.To address this gap,this study develops a basin-scale framework for evaluating physical integrity.Five core functions—hydrological connectivity,flood regulation,physical habitat structure,water-quality purification,and ecological continuity—were identified.Seven categories of anthropogenic stressors were spatially mapped and weighted to construct an Index of Physical Integrity(IPI),accompanied by high-resolution mapping.A Human Activity Index(HAI)was also calculated to quantify disturbance intensity,enabling a quantitative analysis of IPI sensitivity to human pressures and offering a new tool for large-scale integrity assessment.Results show a persistent spatial gradient of"low in urban areas,moderate in plains,and high in hills."From 2015 to 2020,the area of extremely low IPI patches expanded by nearly 70%.The IPI-HAI relationship follows a four-phase nonlinear pattern:(i)a collapse threshold at HAI=0.35;(ii)a recovery zone in the range of 0.35<HAI≤0.50;(iii)a high-resilience window at 0.50<HAI≤0.70;and(iv)marginal decline when HAI>0.75.Seasonal differences were evident:wet-season IPI values exceeded dry-season levels by 0.10～0.30 on average,with differences around lake clusters reaching 0.20.About 93%of the region exhibited declining seasonal integrity,primarily driven by flood-vegetation interactions.Based on these findings,a zoned regulation strategy is proposed:"push beyond 0.35—cross 0.50—hold 0.75."This framework provides an operational,quantitative reference for water-ecological management and restoration,while offering a transferable pathway for assessing physical integrity in other large river systems.关键词
物理完整性/水生态系统/长江中下游/人类活动指数Key words
physical integrity/aquatic ecosystem/middle-lower Yangtze River/Human Activity Index(HAI)分类
资源环境引用本文复制引用
管秋实,杨中华,槐文信..长江中下游水生态系统物理完整性对人类活动强度的阈值响应研究[J].中国农村水利水电,2026,(5):1-9,17,10.基金项目
国家自然科学基金项目(U2340216,52020105006)湖北省技术创新计划项目(2024BCA005) （U2340216,52020105006）
