Wind erodibility indices of aeolian sandy soils impacted by different vegetation restoration:a case study from the Shannan valley of the Yarlung Zangbo River  

作　　者：ZHANG Bao-jun XIONG Dong-hong LIU Lin TANG Yong-fa 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Process,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610041,China [2]College of Water Conservancy and Hydropower Engineering,Sichuan Agricultural University,Ya'an 625014,China

出　　处：《Journal of Mountain Science》2022年第10期2830-2845,共16页山地科学学报（英文）

基　　金：funded by the Second Tibetan Plateau Scientific Expedition and Research Program(2019QZKK0404);the Strategic Priority Research Program of Chinese Academy of Sciences(XDA20020401);the Youth Innovation Promotion Association Program of Chinese Academy of Sciences(2022380)。

摘　　要：Controlling aeolian desertification is a key ecological target on the Tibetan Plateau,especially within the widespread river valleys.Vegetation recovery can change the near-soil surface characteristics,which thus may influence wind erodibility of soils.However,these potential effects are not sufficiently evaluated for aeolian sandy soils.This study selected the Shannan valley of the Yarlung Zangbo River on the southern Tibetan Plateau as a case to investigate the variations in wind erodibility of aeolian sandy soils impacted by different vegetation restoration,since many ecological measures have been implemented in recent decades in the river valley.Eight vegetated sandy lands with different restoration types and ages and two bare sandy lands(as controls)were chosen as test sites.Four vegetated sandy lands were covered by Artemisia wellbyi,Hedysarum scoparium,Sophora moorcroftiana,and Populus L.with the similar restoration age of 10 years.For Sophora moorcroftiana and Populus L.communities,two restoration ages of 6 and over 30 years were also selected respectively.Wind erodibility was reflected by wind erodible fraction(EF),mean weight diameter of dry aggregates(MWD),capillary water capacity(CWC),soil cohesion(CS),and soil penetration resistance(PR)from different aspects.A comprehensive wind erodibility index(CWEI)was further produced by a weighted summation method to combine those five indices together and comprehensively quantify the effects of vegetation restoration on wind erodibility of aeolian sandy soils.The results showed that revegetation was efficient to reduce wind erodibility of aeolian sandy soils.EF generally decreased,while MWD,CWC,CS,and PR increased after vegetation restoration on the aeolian sandy lands.The CWEI of vegetated sandy lands varied greatly from 0.850 to 0 under different restoration types and ages and decreased by 14.4%to 100%compared to the control.Under the four different restoration types,Populus L.had the relatively minimum CWEI,followed by Artemisia wellbyi,Sophora moorcroftiana

关 键 词：Wind erosion Soil erodibility Erodible fraction Vegetation type Ecological restoration Yarlung Zangbo River valley 

分 类 号：X171.4[环境科学与工程—环境科学] S157.1[农业科学—土壤学]