人民长江2025，Vol.56Issue(4)：74-81,8.DOI:10.16232/j.cnki.1001-4179.2025.04.010
丹江口库区土壤氮磷储量空间分布与驱动因素研究
Spatial distribution and driving factors of soil nitrogen and phosphorus storage in Danjiangkou Reservoir Area
摘要
Abstract
The Danjiangkou Reservoir,serving as the primary water source for the South-to-North Water Diversion Middle Route Project,plays a pivotal role in ensuring water security for water receiving areas.Nitrogen(N)and phosphorus(P),essen-tial soil nutrients,are recognized as key contributors to non-point source pollution.Consequently,understanding the spatial distri-bution of soil N and P is critical for assessing eutrophication risk and guiding nutrient management within the reservoir region.To address this,the spatial variability of soil N and P storage,along with their relationships to natural and anthropogenic factors,were examined through field surveys and geostatistical analyses of 345 sampling sites across the reservoir and its upstream catchment.The results showed that:① In the study area,the distribution trend of'high in the northwest and south and low in the east'was generally presented.The spatial structure of soil nitrogen storage was strong(nugget effect＜25％),and the spatial variability of phosphorus storage was relatively more complex.② The spatial distribution of N and P storage was strongly influenced by parent material and land use.Soils derived from carbonate and clastic sedimentary rocks contained significantly higher N and P storage compared to those from other geological substrates.③ From natural perspectives,sustained sediment renewal in rivers/lakes main-tained relatively low nitrogen and phosphorus accumulation levels.From anthropogenic perspectives,long-term fertilization of up-land fields and orchards led to significant nutrient storage aggregation,whereas wetlands and paddy fields exhibited comparatively lower storage due to pronounced nutrient leaching.Paddy field soils exhibited reduced stocks,primarily due to nutrient leaching and runoff.These findings offer a scientific basis for evaluating nutrient loss risks and enhancing soil and water resource manage-ment,while also providing practical recommendations for optimizing land-use planning and fertilization strategies to reduce non-point source pollution.关键词
土壤氮磷储量/水土保持/成土母质/土地利用/丹江口库区Key words
soil nitrogen and phosphorus storage/water and soil conservation/parent material of soil/land use/Danjiangkou Reservoir Area分类
农业科技引用本文复制引用
张勇,秦赫,魏玉杰,姚赫,李依潺,杨丽娜..丹江口库区土壤氮磷储量空间分布与驱动因素研究[J].人民长江,2025,56(4):74-81,8.基金项目
南水北调中线水源有限责任公司科研专项(ZSY/YG-ZX(2023)022) （ZSY/YG-ZX(2023）
国家自然科学基金项目(42477351,42277329) （42477351,42277329）
