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Land surface roughness impacted by typical vegetation restoration projects on aeolian sandy lands in the yarlung zangbo river valley,southern Tibetan plateau

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International Soil and Water Conservation Research 2022年第1期10卷 109-118页

作者： Baojun Zhang Donghong Xiong Yongfa Tang Lin Liu Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu610041China College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa'an625014China

Aeolian sandy lands are widespread and desertification is recognized as one of the main environmental issues in the yarlung zangbo river valley,southern Tibetan *** surface microtopographic var-iations induced by the near soil surface characteristics of plant communities are important compositions of land surface roughness,which likely influence wind *** study was conducted to quantify the effects of typical vegetation restoration on land surface roughness on the aeolian sandy lands,and to identify the main influencing factors of land surface roughness in the yarlung zangbo river *** bare sandy lands(as controls)and eight vegetated sandy lands with different restoration communities and ages were selected,and land surface roughness(LSR),as represented by surface microtopographic variations in this study,was measured by photogrammetric *** results showed that LSR significantly increased by 7.9-16.8 times after vegetation restoration on the aeolian sandy lands,and varied among different restoration communities and *** mostly restored communities of Sophora moorcroftiana and Populus *** greater LSR as compared to Artemisia wellbyi and Hedysarum *** succession from 6 to over 30 years,LSR gradually increased in the Sophora moorcroftiana restored sandy lands,but decreased in the Populus L restored sandy *** variations of LSR were mainly attributed to the differences in near soil surface characteristics of vegetation(plant stem diameter and coverage,and plant residue density)and biological soil crusts(coverage and thickness).Mixed plantation of Populus L and Sophora moorcroftiana was considered as the best restoration communities because of their effectiveness in increasing land surface roughness on the aeolian sandy lands in the yarlung zangbo river *** results would facilitate the understanding of the benefits of vegetation restoration in controlling wind erosion on the aeolian sandy lands.

关键词： Aeolian desertification Surface microtopographic variation Near soil surface characteristics Plant communities yarlung zangbo river valley

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Wind erodibility indices of aeolian sandy soils impacted by different vegetation restoration:a case study from the Shannan valley of the yarlung zangbo river

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Journal of Mountain Science 2022年第10期19卷 2830-2845页

作者： ZHANG Bao-jun XIONG Dong-hong LIU Lin TANG Yong-fa Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa'an 625014China

Controlling aeolian desertification is a key ecological target on the Tibetan Plateau,especially within the widespread river *** recovery can change the near-soil surface characteristics,which thus may influence wind erodibility of ***,these potential effects are not sufficiently evaluated for aeolian sandy *** 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 *** vegetated sandy lands with different restoration types and ages and two bare sandy lands(as controls)were chosen as test *** vegetated sandy lands were covered by Artemisia wellbyi,Hedysarum scoparium,Sophora moorcroftiana,and Populus *** the similar restoration age of 10 *** Sophora moorcroftiana and Populus ***,two restoration ages of 6 and over 30 years were also selected *** 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 *** results showed that revegetation was efficient to reduce wind erodibility of aeolian sandy *** generally decreased,while MWD,CWC,CS,and PR increased after vegetation restoration on the aeolian sandy *** 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 *** the four different restoration types,Populus *** the relatively minimum CWEI,fol

关键词： Wind erosion Soil erodibility Erodible fraction Vegetation type Ecological restoration yarlung zangbo river valley

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Diverse Climatic and Anthropogenic Impacts on Desertification in the Middle Reaches of yarlung zangbo river Catchment on the Tibetan Plateau

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Journal of Earth Science 2023年第6期34卷 1816-1826页

作者： Qi Yu Xianyan Wang Zhiyong Han Xiaodong Miao Huayu Lu School of Geography and Ocean Science Nanjing UniversityNanjing 210023China Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation(Ministry of Education) Xining810016China Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection School of Resource and Environmental SciencesLinyi UniversityLinyi 276000China

The unique desertification processes occurring under the Alpine climate and ecosystem on the Tibetan Plateau could provide critical clues to the natural and anthropogenic impacts on *** study used the Landsat data to investigate the spatial and temporal distribution of desertification from 1990 to 2020 in two areas(Shannan and Mainling),within the yarlung zangbo river *** results show not only distinct spatial patterns but also various temporal changes of *** Shannan,aeolian sand was distributed over wide areas from valley floor to mountain slope,while in Mainling,it is distributed sporadically at the *** aeolian sandy land initially expanded before undergoing long-term shrinkage in *** in Mainling,it steadily expanded followed by a rapid *** changes are attributed to both climate change and human *** increase in temperature causes desertification expansion in Shannan,while favorable climate conditions coupled with decreasing human activity promoted desertification ***,both the expansion and shrinkage of desertification were sensitive to human activity in *** highlights the diverse responses of desertification to natural and anthropogenic impacts on different backgrounds of climatic and vegetation coverage.A threshold of climatic conditions may control the dominance factors in desertification,shifting from natural to anthropogenic elements.

关键词： desertification reversal of desertification human activities climate change remote sensing yarlung zangbo river valley

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