[1]吕发友,唐强,张淑娟,等.三峡水库消落带紫色土物理性质对反复淹水作用的响应[J].水土保持研究,2018,25(01):276-281.
　LYU Fayou,TANG Qiang,ZHANG Shujuan,et al.Response of Purple Soil Physical Properties to Repeated Water Flooding in Water-Level Fluctuation Zone in the Three Gorges Reservoir[J].Research of Soil and Water Conservation,2018,25(01):276-281.
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三峡水库消落带紫色土物理性质对反复淹水作用的响应

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 25 期数: 2018年01期 页码: 276-281 栏目: 出版日期: 2018-02-28
Title:
Response of Purple Soil Physical Properties to Repeated Water Flooding in Water-Level Fluctuation Zone in the Three Gorges Reservoir
作者:
吕发友1,2, 唐强1, 张淑娟1,2, 贺秀斌1, 鲍玉海1
1. 中国科学院 水利部 成都山地灾害与环境研究所 山地表生过程与生态调控重点实验室, 成都 610041;
2. 中国科学院大学, 北京 100049
Author(s):
LYU Fayou1,2, TANG Qiang1, ZHANG Shujuan1,2, HE Xiubin1, BAO Yuhai1
1. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China
关键词:
三峡水库; 消落带; 紫色土; 物理性质; 反复淹水
Keywords:
Three Gorges Reservoir; water-level fluctuation zone; physical properties; repeated flooding
分类号:
S151.9+2
摘要:
为探明三峡水库土质消落带土壤物理性质对反复淹水的响应，选取消落带代表性土壤紫色土，以180 m处未淹水土壤为对照，分析了土壤基本物理性质在消落带上的分布规律及其对淹水的响应规律。结果表明：表层土的基本物理性质对淹水响应最为强烈。随水位高程增加，土壤容重逐渐降低，最大降幅16.42%；淹水后土壤容重显著增加，最大增幅达38.42%。孔隙率整体呈先降低后增高的趋势，在160 m处出现最小值40.77%；淹水后孔隙率显著降低，最大降幅达35.10%。颗粒组成呈低水位段粗、高水位段细，表层粗、下层细的特征分布；随水位高程增加，粗颗粒（砂粒）的体积百分比和中值粒径均减小，降幅分别为40.47%和52.99%；淹水后砂粒含量和中值粒径均显著增加，最大增幅达91.60%和141.72%。同一时期黏聚力在消落带以先增高后降低的趋势分布，最大变化幅度达195.76%，淹水前后黏聚力最大变化幅度达163.24%；内摩擦角的分布随水位高程变化较小，淹水前后内摩擦角最大变化幅度达54.42%。本文研究结果可为消落带土壤侵蚀机理研究和科学防治提供参考。
Abstract:
The purple soil of Three Gorges Reservoir region water-level fluctuation zone was selected to explore the response of soil physical properties to repeated flooding. The distribution pattern of soil physical properties and their response to water flooding were analyzed and compared with the non-flooded soil at 180 m. Soil samples were collected in two layers of 10 cm each for analysis. The results showed that the strongest influence on the topsoil was observed due to flooding. The soil bulk density decreased with an increase in elevation of water level, and the maximum decrease in the soil bulk density was 16.42%. After impounding, the soil bulk density increased significantly, and the maximum increase in soil bulk density was 38.42%. The soil porosity reached to the lowest point (40.77%) at 160 m. Flooding significantly reduced the porosity, and it reached its lowest point of 35.10%. The grain composition became coarser with the decrease of the water elevation level and soil layer. With the increase of elevation of the water level, percentage volume of coarse particles gradually decreased for the two layers, and decreased by 40.47% and 52.99%, respectively. Flooding had positive effects on the percent volume of sand and median diameter, and the maximum value of sand increased by 91.60% and 141.72% for the two layers, respectively. The cohesion presented the unimodal curve along the water-level fluctuation during the same period, the maximum amplitude of variation was 195.76%. Flooding resulted in the increase of soil cohesion, the maximum variation was 163.24%. There was no significant distinction in internal friction angle with elevation changes. Flooding altered the internal friction angle, and its maximum value reached to 54.42%. The results of the present study can be used as the references for analyzing the mechanism of soil erosion and controlling the soil erosion.

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备注/Memo

收稿日期:2017-2-26;改回日期:2017-4-15。
基金项目:国家自然科学基金项目（41571278）；中国科学院科技服务网络计划项目（KFJ-SW-STS-175）；中国科学院“西部之光”人才培养引进计划（2013&2016）
作者简介:吕发友(1990-),男,四川中江人,硕士研究生,主要从事消落带土壤侵蚀与水土保持研究。E-mail:fayoul@163.com
通讯作者:贺秀斌(1967-),男,陕西镇安人,研究员,主要从事土壤侵蚀与水土保持研究。E-mail:xiubinh@imde.ac.cn

更新日期/Last Update: 1900-01-01