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Variation of soil hydraulic properties with alpine grassland degradation in the eastern Tibetan Plateau
Pan, Tao1,3; Hou, Shuai1,2; Wu, Shaohong1; Liu, Yujie1; Liu, Yanhua1; Zou, Xintong1,2; Herzberger, Anna3; Liu, Jianguo3
2017-05-02
Source PublicationHYDROLOGY AND EARTH SYSTEM SCIENCES
ISSN1027-5606
Volume21Issue:4Pages:2249-2261
Corresponding AuthorLiu, Yujie(liuyujie@igsnrr.ac.cn)
AbstractEcosystems in alpine mountainous regions are vulnerable and easily disturbed by global environmental change. Alpine swamp meadow, a unique grassland type in the eastern Tibetan Plateau that provides important ecosystem services to the upstream and downstream regions of international rivers of Asia and other parts of the world, is undergoing severe degradation, which can dramatically alter soil hydraulic properties and water cycling processes. However, the effects of alpine swamp meadow degradation on soil hydraulic properties and the corresponding influencing mechanisms are still poorly understood. In this study, soil moisture content (SMC), field capacity (FC) and saturated hydraulic conductivity (K-s) together with several basic soil properties under lightly degraded (LD), moderately degraded (MD) and severely degraded (SD) alpine swamp meadow were investigated; the variations in SMC, FC and K-s with alpine swamp meadow degradation and their dominant influencing factors were analysed. The results showed that SMC and FC decreased consistently from LD to SD, while K-s decreased from LD to MD and then increased from MD to SD, following the order of LD > SD > MD. Significant differences in soil hydraulic properties between degradation degrees were found in the upper soil layers (0-20 cm), indicating that the influences of degradation were most pronounced in the top-soils. FC was positively correlated with capillary porosity, water-stable aggregates, soil organic carbon, and silt and clay content; K-s was positively correlated with non-capillary porosity (NCP). Relative to other soil properties, soil porosity is the dominant factor influencing FC and K-s. Capillary porosity explained 91.1% of total variance in FC, and NCP explained 97.3% of total variance in K-s. The combined effect of disappearing root activities and increasing sand content was responsible for the inconsistent patterns of NCP and K-s. Our findings suggest that alpine swamp meadow degradation would inevitably lead to reduced water holding capacity and rainfall infiltration. This study provides a more comprehensive understanding of the soil hydrological effects of vegetation degradation. Further hydrological modelling studies in the Tibetan Plateau and similar regions are recommended to understand the effects of degraded alpine swamp meadows on soil hydraulic properties.
DOI10.5194/hess-21-2249-2017
WOS KeywordLOESS PLATEAU ; LAND-USE ; SPATIAL VARIABILITY ; FIELD-CAPACITY ; CHINA ; CONDUCTIVITY ; HYDROLOGY ; IMPACT ; WATER ; RESTORATION
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41671107] ; National Natural Science Foundation of China[41301092] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2016049]
Funding OrganizationNational Natural Science Foundation of China ; Youth Innovation Promotion Association of the Chinese Academy of Sciences
WOS Research AreaGeology ; Water Resources
WOS SubjectGeosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000400516200001
PublisherCOPERNICUS GESELLSCHAFT MBH
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Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/62647
Collection中国科学院地理科学与资源研究所
Corresponding AuthorLiu, Yujie
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Michigan State Univ, Ctr Syst Integrat & Sustainabil, Dept Fisheries & Wildlife, E Lansing, MI 48824 USA
Recommended Citation
GB/T 7714
Pan, Tao,Hou, Shuai,Wu, Shaohong,et al. Variation of soil hydraulic properties with alpine grassland degradation in the eastern Tibetan Plateau[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2017,21(4):2249-2261.
APA Pan, Tao.,Hou, Shuai.,Wu, Shaohong.,Liu, Yujie.,Liu, Yanhua.,...&Liu, Jianguo.(2017).Variation of soil hydraulic properties with alpine grassland degradation in the eastern Tibetan Plateau.HYDROLOGY AND EARTH SYSTEM SCIENCES,21(4),2249-2261.
MLA Pan, Tao,et al."Variation of soil hydraulic properties with alpine grassland degradation in the eastern Tibetan Plateau".HYDROLOGY AND EARTH SYSTEM SCIENCES 21.4(2017):2249-2261.
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