水利水电技术（中英文）2026，Vol.57Issue(5)：14-27,14.DOI:10.13928/j.cnki.wrahe.2026.05.002
地质灾害与人类活动复合扰动引起的景观重构对河流水质的影响
Impacts of landscape reconstruction caused by combined disturbances of geological disasters and human activities on river water quality
摘要
Abstract
[Objective]To clarify the quantitative impact mechanism of landscape pattern reconstruction on river water quality under the compound influence of geological disasters and intensive human activities in dry-hot valley basins,thereby providing a scientific basis for the coordinated management of soil and water resources in ecologically fragile areas of Southwest China.[Methods]Taking the Xiaojiang River Basin in the lower reaches of the Jinsha River as the study area,a synchronous monitoring network for water,sediment,and water quality was integrated.Landscape patterns were quantitatively analyzed using Fragstats 4.2 software.Redundancy analysis was applied to systematically investigate the impact of landscape reconstruction on river water quality under the combined action of human activities and geological disasters.[Results]The results showed that:(1)the average values of key water quality indicators such as total phosphorus,total nitrogen,ammonia nitrogen,and COD during the flood season were 2.00,1.88,3.21 and 4.43 times higher than those of the non-flood season,respectively.(2)The average concentrations of total nitrogen and COD were 2.28 mg/L and 27.36 mg/L in the disaster-affected areas,2.03 mg/L and 9.23 mg/L in the residential areas,and 2.00 mg/L and 6.60 mg/L in the cultivated land.(3)Under rainstorm events,the pre-rain fluxes of total phosphorus,total nitrogen,ammonia nitrogen,and COD were 1.95,2.41,2.34,and 4.74 times higher than the post-rain fluxes,with the most pronounced increase observed in the disaster-affected areas.(4)At different buffer zone scales,the selected landscape indices explained over 94.00％of the water quality variation during the flood season.The indices with the highest explanation rate were the aggregation index of disaster-affected areas(43.10％),the dispersion and adjacency index of residential areas(40.70％),and the division index of cultivated land(16.80％).[Conclusion]Water quality indicators in the Xiaojiang River Basin exhibit significant seasonal variations.Spatially,pollutant concentration gradient follows the pattern:disaster-affected areas＞residential areas＞cultivated land.These spatial disparities are further amplified under the influence of rainstorm.Landscape pattern reconstruction caused by landslides and debris flows-similar to that driven by urbanization and agricultural expansion-may cause further deterioration of river water quality.The findings provide scientific guidance for soil and water conservation,aquatic environment protection,and disaster mitigation in the dry-hot valleys of Southwest China.关键词
干热河谷/土地利用/景观格局/灾害迹地/河流水质/人类活动/时空分布/生态脆弱区Key words
dry-hot valleys/land use/landscape pattern/disaster-affected areas/river water quality/human activities/spatiotemporal distribution/ecologically fragile areas分类
建筑与水利引用本文复制引用
唐鸿磊,杨逸飞,刘璐,陈东..地质灾害与人类活动复合扰动引起的景观重构对河流水质的影响[J].水利水电技术（中英文）,2026,57(5):14-27,14.基金项目
国家重点研发计划项目"泥沙与生源要素变化对生物生境影响的调控技术及应用"(2022YFC3203903) （2022YFC3203903）
中国水利水电科学研究院流域水循环模拟与调控国家重点实验室开放研究基金项目(IWHR-SKL-KF202220) （IWHR-SKL-KF202220）
云南省基础研究计划青年项目(202201AU070130) （202201AU070130）
国家自然科学基金项目(52469014) （52469014）
