Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed
Two main types of grasslands on the Qinghai-Tibet Plateau, alpine swamp and alpine meadow, were selected for this study. Monitoring plots were constructed on each type of grassland with varying degrees of vegetation degradation. The impacts of alpine grassland cover changes on the hillslope water cy...
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Language: | English |
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Online Access: | http://ir.imde.ac.cn/handle/131551/6280 https://doi.org/10.1016/j.jhydrol.2012.03.033 |
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ftchinacadscimhe:oai:ir.imde.ac.cn:131551/6280 2023-05-15T17:57:42+02:00 Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed Wang Genxu Liu Guangsheng Li Chunjie 2012 http://ir.imde.ac.cn/handle/131551/6280 https://doi.org/10.1016/j.jhydrol.2012.03.033 英语 eng JOURNAL OF HYDROLOGY Wang Genxu,Liu Guangsheng,Li Chunjie. Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed[J]. JOURNAL OF HYDROLOGY,2012,444:22-33. http://ir.imde.ac.cn/handle/131551/6280 doi:10.1016/j.jhydrol.2012.03.033 4 Alpine Grassland Vegetation Degradation Hillslope Water Cycle Influence Permafrost Watershed Science & Technology Technology Physical Sciences Engineering Geology Water Resources LAND-USE CHANGES RUNOFF CHARACTERISTICS TIBETAN PLATEAU QINGHAI-TIBET RIVER-BASIN SOIL CATCHMENT GENERATION CLIMATE REGIONS Civil Geosciences Multidisciplinary Article 期刊论文 2012 ftchinacadscimhe https://doi.org/10.1016/j.jhydrol.2012.03.033 2022-12-19T18:18:17Z Two main types of grasslands on the Qinghai-Tibet Plateau, alpine swamp and alpine meadow, were selected for this study. Monitoring plots were constructed on each type of grassland with varying degrees of vegetation degradation. The impacts of alpine grassland cover changes on the hillslope water cycle were analyzed in terms of runoff generation, precipitation interception, dew water formation, and soil water dynamics of the active layer, etc. The results showed that different types of grasslands led to different runoff generation regimes; namely, runoff varied linearly with precipitation in alpine swamp, whereas in alpine meadow, runoff exhibited an exponential precipitation-dependence. The decrease in vegetation cover in alpine swamp leads to a decrease in soil moisture content in the top 20 cm of the soil, a delay in the thawing start time in the spring, and a decrease in both surface runoff and subsurface interflow. In alpine meadow, however, the decrease in vegetation cover led to a significant increase in the depth of topsoil moisture content during the thawing period, earlier occurrence of thawing, and an increase in the runoff generation ratio. The alpine meadow vegetation canopy had a higher maximum interception ratio and saturation precipitation than alpine swamp vegetation. With the decrease in vegetation cover, the rainfall interception ratios decreased by almost an identical range in both the alpine meadow and alpine swamp grasslands. Dew water commonly occurs on alpine grassland, accounting for about 12.5-16.5% of precipitation in the same period, and thus, is an important component of the water cycle. With the degradation of vegetation, surface dew water decreased; however, the ratio of dew water formed in the air to the total amount of dew water rose significantly. At the hillslope scale, the changes of alpine vegetation cover had a great influence on the water cycle, which were partly attributed to that the changes of alpine vegetation cover directly altered the surface energy balance, surface ... Article in Journal/Newspaper permafrost IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) Journal of Hydrology 444-445 22 33 |
institution |
Open Polar |
collection |
IMHE OpenIR (Institute of Mountain Hazards and Environment, Chinese Academy of Sciences) |
op_collection_id |
ftchinacadscimhe |
language |
English |
topic |
Alpine Grassland Vegetation Degradation Hillslope Water Cycle Influence Permafrost Watershed Science & Technology Technology Physical Sciences Engineering Geology Water Resources LAND-USE CHANGES RUNOFF CHARACTERISTICS TIBETAN PLATEAU QINGHAI-TIBET RIVER-BASIN SOIL CATCHMENT GENERATION CLIMATE REGIONS Civil Geosciences Multidisciplinary |
spellingShingle |
Alpine Grassland Vegetation Degradation Hillslope Water Cycle Influence Permafrost Watershed Science & Technology Technology Physical Sciences Engineering Geology Water Resources LAND-USE CHANGES RUNOFF CHARACTERISTICS TIBETAN PLATEAU QINGHAI-TIBET RIVER-BASIN SOIL CATCHMENT GENERATION CLIMATE REGIONS Civil Geosciences Multidisciplinary Wang Genxu Liu Guangsheng Li Chunjie Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed |
topic_facet |
Alpine Grassland Vegetation Degradation Hillslope Water Cycle Influence Permafrost Watershed Science & Technology Technology Physical Sciences Engineering Geology Water Resources LAND-USE CHANGES RUNOFF CHARACTERISTICS TIBETAN PLATEAU QINGHAI-TIBET RIVER-BASIN SOIL CATCHMENT GENERATION CLIMATE REGIONS Civil Geosciences Multidisciplinary |
description |
Two main types of grasslands on the Qinghai-Tibet Plateau, alpine swamp and alpine meadow, were selected for this study. Monitoring plots were constructed on each type of grassland with varying degrees of vegetation degradation. The impacts of alpine grassland cover changes on the hillslope water cycle were analyzed in terms of runoff generation, precipitation interception, dew water formation, and soil water dynamics of the active layer, etc. The results showed that different types of grasslands led to different runoff generation regimes; namely, runoff varied linearly with precipitation in alpine swamp, whereas in alpine meadow, runoff exhibited an exponential precipitation-dependence. The decrease in vegetation cover in alpine swamp leads to a decrease in soil moisture content in the top 20 cm of the soil, a delay in the thawing start time in the spring, and a decrease in both surface runoff and subsurface interflow. In alpine meadow, however, the decrease in vegetation cover led to a significant increase in the depth of topsoil moisture content during the thawing period, earlier occurrence of thawing, and an increase in the runoff generation ratio. The alpine meadow vegetation canopy had a higher maximum interception ratio and saturation precipitation than alpine swamp vegetation. With the decrease in vegetation cover, the rainfall interception ratios decreased by almost an identical range in both the alpine meadow and alpine swamp grasslands. Dew water commonly occurs on alpine grassland, accounting for about 12.5-16.5% of precipitation in the same period, and thus, is an important component of the water cycle. With the degradation of vegetation, surface dew water decreased; however, the ratio of dew water formed in the air to the total amount of dew water rose significantly. At the hillslope scale, the changes of alpine vegetation cover had a great influence on the water cycle, which were partly attributed to that the changes of alpine vegetation cover directly altered the surface energy balance, surface ... |
format |
Article in Journal/Newspaper |
author |
Wang Genxu Liu Guangsheng Li Chunjie |
author_facet |
Wang Genxu Liu Guangsheng Li Chunjie |
author_sort |
Wang Genxu |
title |
Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed |
title_short |
Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed |
title_full |
Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed |
title_fullStr |
Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed |
title_full_unstemmed |
Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed |
title_sort |
effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed |
publishDate |
2012 |
url |
http://ir.imde.ac.cn/handle/131551/6280 https://doi.org/10.1016/j.jhydrol.2012.03.033 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
JOURNAL OF HYDROLOGY Wang Genxu,Liu Guangsheng,Li Chunjie. Effects of changes in alpine grassland vegetation cover on hillslope hydrological processes in a permafrost watershed[J]. JOURNAL OF HYDROLOGY,2012,444:22-33. http://ir.imde.ac.cn/handle/131551/6280 doi:10.1016/j.jhydrol.2012.03.033 |
op_rights |
4 |
op_doi |
https://doi.org/10.1016/j.jhydrol.2012.03.033 |
container_title |
Journal of Hydrology |
container_volume |
444-445 |
container_start_page |
22 |
op_container_end_page |
33 |
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1766166199138254848 |