DOI: 10.5194/hess-18-4933-2014
Scopus记录号: 2-s2.0-84916891496
论文题名: Negative trade-off between changes in vegetation water use and infiltration recovery after reforesting degraded pasture land in the Nepalese Lesser Himalaya
作者: Ghimire C ; P ; , Bruijnzeel L ; A ; , Lubczynski M ; W ; , Bonell M
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 12 起始页码: 4933
结束页码: 4949
语种: 英语
Scopus关键词: Agronomy
; Drought
; Economic and social effects
; Evapotranspiration
; Forestry
; Rain
; Soils
; Vegetation
; Water supply
; Broad-leaved forests
; Evaporative loss
; Pine plantations
; Rainfall interception
; Severely degraded grasslands
; Soil degradation
; Soil improvement
; Understory vegetation
; Infiltration
; coniferous forest
; evapotranspiration
; forest management
; grassland
; infiltration
; pasture
; rainwater
; reforestation
; trade-off
; water uptake
; Himalayas
; Lesser Himalayas
; Nepal
英文摘要: This work investigates the trade-off between increases in vegetation water use and rain water infiltration afforded by soil improvement after reforesting severely degraded grassland in the Lesser Himalaya of central Nepal. The hillslope hydrological functioning (surface and subsurface soil hydraulic conductivities and overland flow generation) and the evapotranspiration (rainfall interception and transpiration) of the following contrasting vegetation types were quantified and examined in detail: (i) a nearly undisturbed, natural broadleaved forest; (ii) a 25-year-old, intensively-used pine plantation; and (iii) a highly degraded pasture. Planting pines increased vegetation water use relative to the pasture and natural forest situation by 355 and 55 mm year-1, respectively. On balance, the limited amount of extra infiltration afforded by the pine plantation relative to the pasture (only 90 mm year-1 due to continued soil degradation associated with regular harvesting of litter and understory vegetation in the plantation) proved insufficient to compensate the higher water use of the pines. As such, observed declines in dry season flows in the study area are thought to mainly reflect the higher water use of the pines although the effect could be moderated by better forest and soil management promoting infiltration. In contrast, a comparison of the water use of the natural forest and degraded pasture suggests that replacing the latter by (mature) broadleaved forest would (ultimately) have a near-neutral effect on dry season flows as the approximate gains in infiltration and evaporative losses were very similar (ca. 300 mm year-1 each). The results of the present study underscore the need for proper forest management for optimum hydrological functioning as well as the importance of protecting the remaining natural forests in the region. © Author(s) 2014. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78052
Appears in Collections: 气候变化事实与影响
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作者单位: Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, Netherlands; Critical Zone Hydrology Group, Faculty of Earth and Life Sciences, VU University, Amsterdam, Netherlands; Centre for Water Law, Policy and Science under the Auspices of Unesco, Peters Building, University of Dundee, Dundee, United Kingdom
Recommended Citation:
Ghimire C,P,, Bruijnzeel L,et al. Negative trade-off between changes in vegetation water use and infiltration recovery after reforesting degraded pasture land in the Nepalese Lesser Himalaya[J]. Hydrology and Earth System Sciences,2014-01-01,18(12)