水土保持学报2025，Vol.39Issue(6)：57-65,9.DOI:10.13870/j.cnki.stbcxb.2025.06.017
三峡水库消落带沉积泥沙与土壤的养分特征差异
Differences in Nutrient Characteristics Between Deposited Sediment and Original Soil in Water-Level Fluctuation Zone of Three Gorges Reservoir
摘要
Abstract
[Objective]To reveal the differences in nutrient characteristics between deposited sediment and native soil within the water-level fluctuation zone(WLFZ)of the Three Gorges Reservoir,thereby providing a scientific basis for ecological restoration and management of the WLFZ.[Methods]Taking the silty WLFZ of the Three Gorges Reservoir as the study area,samples of deposited sediment and native soil were collected to analyze particle composition and nutrient contents,including total organic carbon(TOC),total nitrogen(TN),and total phosphorus(TP).A comprehensive nutrient index(CNI)was calculated for both sediment and soil samples using the weighted sum method,and their differences in nutrient characteristics were comparatively analyzed.[Results]1)The median particle diameter(d₅₀)of deposited sediment in WLFZ ranged from 5.57 to 10.29 μm with an average value of 8.54 μm,significantly smaller than those of native soil,which were 10.97-19.57 μm and 15.67 μm(p<0.01).Along the longitudinal direction of reservoir channel,the sediment particles exhibited a pronounced fining trend,while the spatial variation in soil particle composition was not significant.2)The average mass fractions of TOC,TN,and TP in deposited sediment of the WLFZ were 11.34,1.83,and 0.63 g/kg,respectively.Among them,TOC and TN mass fractions were significantly higher than those in native soil(4.23 and 0.73 g/kg)(p<0.01),while the TP content showed no significant difference.The C∶N,C∶P,and N∶P ratios of sediment were 6.26,18.50,and 2.96,respectively.Among them,the C∶P and N∶P ratios were significantly higher than those of soil(3.23 and 1.65)(p<0.01),while the C∶N ratio exhibited no significant difference.3)Significant differences were observed in the CNI between deposited sediment and soil in the WLFZ(p<0.01).Among them,the average CNI of the deposited sediment was 0.50,classified as Grade Ⅲ,while that of the soil was 0.28,classified as Grade Ⅳ.4)The nutrient characteristics of deposited sediment in the WLFZ were significantly correlated with its particle composition,while no statistically significant correlation was observed between the nutrient characteristics and particle composition of soil.[Conclusion]There are significant differences in nutrient characteristics between deposited sediment and soil in the WLFZ of the Three Gorges Reservoir,with erosion and deposition processes being the main driving factors for these differences.关键词
沉积泥沙/原地土壤/养分特征/消落带/三峡水库Key words
deposited sediment/original soil/nutrient characteristics/water-level fluctuation zone/Three Gorges Reservoir分类
资源环境引用本文复制引用
段金宝,李进林,韦杰,唐强,贺秀斌,黄平,吴胜军..三峡水库消落带沉积泥沙与土壤的养分特征差异[J].水土保持学报,2025,39(6):57-65,9.基金项目
三峡后续工作科研项目(5000002024CC20004) （5000002024CC20004）
国家自然科学基金项目(42207411,42371071,42307461) （42207411,42371071,42307461）
重庆市博士后出站留(来)渝资助项目 （来）
重庆市两江新区出站博士后科研经费支持项目 （）
