香根草植物篱对三峡库区紫色土坡地泥沙沉积的影响  

Influence of Vetiveria Zizanioides Hedgerow on the Sediment Deposition of Purple Soil Slope in the Three Gorges Reservoir Area

作　　者：肖海 刘子睿[1] 夏振尧 郭萍[1,4] 闫茹冰[1] 向瑞 高峰 张伦 XIAO Hai;LIU Zirui;XIA Zhenyao;GUO Ping;YAN Rubing;XIANG Rui;GAO Feng;ZHANG Lun(Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,Yichang 443002,Hubei,China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,Hubei,China;Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang 443002,Hubei,China;School of Architecture and Civil Engineering,Huizhou University,Huizhou 516007,Guangdong,China)

机构地区：[1]三峡库区地质灾害教育部重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]三峡大学三峡库区生态环境教育部工程研究中心,湖北宜昌443002 [4]惠州学院建筑与土木工程学院,广东惠州516007

出　　处：《武汉大学学报（理学版）》2024年第1期129-138,共10页Journal of Wuhan University:Natural Science Edition

基　　金：国家自然科学基金(41807068,42277323,U2040207);土木工程防灾减灾湖北省引智创新示范基地(2021EJD026);中国三峡建设管理有限公司科研项目(BHT/0869)。

摘　　要：以三峡库区紫色土坡地为研究对象,设置2个降雨强度(60和120 mm/h)和3种坡面条件(裸坡对照CK、植物篱P和仅有植物篱根系R),采用稀土元素示踪技术结合人工模拟降雨实验,研究了香根草植物篱对坡地泥沙沉积的影响。结果显示,坡地泥沙沉积主要发生在坡面中下部(0~40和>40~140 cm示踪段),与CK相比,R和P坡面的沉积速率平均分别增加了42.88%和79.06%。CK条件下,60 mm/h降雨强度时各坡段对总沉积的贡献随坡段位置的升高而增加,在>340~440 cm示踪段达到60.13%,120 mm/h降雨强度则呈现波动变化;P和R条件下,>140~240和>340~440 cm示踪段贡献率相对较大,>240~340 cm示踪段贡献率相对较小。结果表明,香根草植物篱明显改变了坡地泥沙沉积分布和各示踪段沉积泥沙来源,造成坡地上部泥沙对总沉积的贡献减小而坡地中下部对总沉积的贡献增加。Taking the purple soil slope in the Three Gorges Reservoir Area as the research object,the present study employed the rare earth element tracing method to differentiate sediment sources.Simulated rainfall experiments were conducted under three slope conditions(CK:control slope;P:hedgerow and R:only hedgerow root)at two rainfall intensities(60 mm/h and 120 mm/h)to assess the effects of Vetiveria Zizanioides hedgerows on sediment deposition.The findings revealed that the sediment primarily deposited in the middle and lower parts of the slope(in the tracer sections of 0~40 cm and>40~140 cm).Compared with the control slope(CK)condition,the deposition rates increased by 42.88%and 79.06%under the R and P slope conditions,respectively.Under the CK slope condition,the contribution of each slope section to the total deposition increased with the slope position under a rainfall intensity of 60 mm/h.Specifically,the tracer section ranging from>340 to 440 cm reached a contribution rate of 60.13%;however,under a rainfall intensity of 120 mm/h,the contribution of each slope section to the total deposition exhibited a fluctuating pattern.Under the P and R slope conditions,the contribution increased in the tracer sections ranging from>140 to 240 cm and from>340 to 440 cm,but decreased in the tracer section ranging from>240 to 340 cm.Therefore,the presence of hedgerows significantly altered the sediment distribution on the slope and the sedimentation source of deposition,leading to a reduced contribution of the upper slope and an increased contribution of the middle and lower slopes to the total deposition.

关 键 词：三峡库区 沉积分布 植物篱 稀土元素示踪 紫色土 

分 类 号：S157.9[农业科学—土壤学]