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三峡水库典型支流消落带泥沙颗粒态磷复合指纹示踪研究
Alternative TitleFingerprinting particulate phosphorus absorbed by sediments for riparian zone deposits in tributary of Three Gorges Reservoir
陈太丽1,2; 史忠林1; 王永艳1,2; 严冬春1; 文安邦1; 陈佳村1,2
2019
Source Publication农业工程学报
ISSN1002-6819
Volume35Issue:20Pages:118-124
SubtypeArticle
Contribution Rank1
Abstract三峡水库消落带是库区水域与周边陆地环境的关键过渡地带,周期性反季节干湿交替使其具有强烈的物质交换特征。辨析消落带泥沙及其吸附的颗粒态磷的来源对消落带土壤污染防治和环境效应评估以及三峡水环境保护具有重要意义。以三峡库区汝溪河支流不同高程(145~155、>155~165、>165~175 m)消落带为研究对象,运用复合指纹技术查明,消落带泥沙中颗粒态磷的主要来源是长江干流悬移质和汝溪河上游悬移质。淹水期间长江干流江水顶托引起的泥沙沉积是颗粒态磷的主要来源,在>165~175 m高程带对颗粒态磷的贡献达到最大(54.5%)。雨季初期支流上游悬移质对145~155 m高程消落带的颗粒态磷贡献最大(51.6%),而随高程的增加贡献率减少。消落带上方的土壤侵蚀产沙主要堆积在>155~165和>165~175 m高程范围内,导致消落带上方土壤对泥沙和颗粒态磷的贡献率都随高程的增加而增加。
Other AbstractInformation on deposited sediment and associated particulate phosphorus(PP)is of great importance for development of effective management strategies in the riparian zone of the Three Gorges Reservoir.In this study,a composite fingerprinting approach was used to identify the sources of deposited sediment and associated PP in the riparian zone with different elevations(145-155,>155-165,>165-175 m)along the Ruxi tributary channel.Three potential sediment sources were defined:the topsoil above the 175 m elevation level of the riparian zone,and the suspended sediments transported by both the mainstream of Yangtze River and the upstream Ruxi River.The target deposited sediments were collected at different elevation levels of the riparian zone along the Ruxi River and a total of 18 geochemical properties factors were analyzed for the size fraction of sediment smaller than 63 mum.A commonly used 3-step(range test,KW-H test and DFA analysis)statistical methodology to element selection was applied to select the optimum subset of tracer properties that could best discriminate sources.The relative contribution of the 3 potential sources to the deposited sediment in the riparian zone was estimated using a frequentist-based multivariate mixing model.The relative importance of those sources to the overall PP was then determined by combining the information obtained from deposited sediment sources with information on the P content of those sources.Source apportionment results showed that the suspended sediments transported by both the Yangtze mainstream and the upstream Ruxi tributary represent the dominant sources of PP deposits in the riparian zone,which account for 88.6%-95.4% of the PP input.The corresponding sediment contribution from these 2 sources ranged from 69.7% to 84.2%,which varied between elevation levels.The PP contribution from the Yangtze mainstream was 54.5% for the >165-175 m level.The relative PP contribution from the Ruxi River was the most important during the early wet season,which was 51.6%(145-155 m).In contrast,the PP input from the topsoil above the 175 m level of the riparian zone exhibited to be less important(mean of 8.5%)during the study period.The information on sediment contribution of this source reveals that most of the eroded sediment from the topsoil above the 175 m level was preferentially deposited in the elevation levels of <155-165 m and >165-175 m.The findings of this research highlight the important impacts of impoundment on the riparian zone of the tributaries of the reservoir in terms of sediment accumulation and pollution.
Keyword 泥沙 元素 消落带 复合指纹技术
DOI10.11975/j.issn.1002-6819.2019.20.015
Indexed ByEI ; CSCD
Language中文
CSCD IDCSCD:6626154
EI Accession NumberAccession number:20200207998640
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/33860
Collection山地表生过程与生态调控重点实验室
科技与合作处
Corresponding Author史忠林
Affiliation1.中国科学院水利部成都山地灾害与环境研究所;
2.中国科学院大学
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
陈太丽,史忠林,王永艳,等. 三峡水库典型支流消落带泥沙颗粒态磷复合指纹示踪研究[J]. 农业工程学报,2019,35(20):118-124.
APA 陈太丽,史忠林,王永艳,严冬春,文安邦,&陈佳村.(2019).三峡水库典型支流消落带泥沙颗粒态磷复合指纹示踪研究.农业工程学报,35(20),118-124.
MLA 陈太丽,et al."三峡水库典型支流消落带泥沙颗粒态磷复合指纹示踪研究".农业工程学报 35.20(2019):118-124.
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