globalchange  > 气候变化事实与影响
DOI: 10.5194/hess-20-2691-2016
Scopus记录号: 2-s2.0-84978871032
论文题名:
Contradictory hydrological impacts of afforestation in the humid tropics evidenced by long-term field monitoring and simulation modelling
作者: Lacombe G; , Ribolzi O; , De Rouw A; , Pierret A; , Latsachak K; , Silvera N; , Dinh R; P; , Orange D; , Janeau J; -L; , Soulileuth B; , Robain H; , Taccoen A; , Sengphaathith P; , Mouche E; , Sengtaheuanghoung O; , Duc T; T; , Valentin C
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期:7
起始页码: 2691
结束页码: 2704
语种: 英语
Scopus关键词: Agriculture ; Biodiversity ; Catchments ; Cultivation ; Ecosystems ; Environmental impact ; Floods ; Forestry ; Land use ; Rain ; Runoff ; Soil conservation ; Stream flow ; Tropics ; Water resources ; Hydrological changes ; Hydrological impacts ; Hydrometeorological variables ; Natural forest regenerations ; Shifting cultivations ; Streamflow variability ; Trend detection tests ; Water and soil conservations ; Reforestation ; afforestation ; biodiversity ; catchment ; ecosystem service ; environmental impact ; flood ; humid tropics ; land use change ; modernization ; numerical model ; rainfall ; restoration ecology ; shifting cultivation ; simulation ; streamflow ; tree planting ; water resource ; Laos ; Viet Nam ; Tectona grandis
英文摘要: The humid tropics are exposed to an unprecedented modernisation of agriculture involving rapid and mixed land-use changes with contrasted environmental impacts. Afforestation is often mentioned as an unambiguous solution for restoring ecosystem services and enhancing biodiversity. One consequence of afforestation is the alteration of streamflow variability which controls habitats, water resources, and flood risks. We demonstrate that afforestation by tree planting or by natural forest regeneration can induce opposite hydrological changes. An observatory including long-term field measurements of fine-scale land-use mosaics and of hydrometeorological variables has been operating in several headwater catchments in tropical southeast Asia since 2000. The GR2M water balance model, repeatedly calibrated over successive 1-year periods and used in simulation mode with the same year of rainfall input, allowed the hydrological effect of land-use change to be isolated from that of rainfall variability in two of these catchments in Laos and Vietnam. Visual inspection of hydrographs, correlation analyses, and trend detection tests allowed causality between land-use changes and changes in seasonal streamflow to be ascertained. In Laos, the combination of shifting cultivation system (alternation of rice and fallow) and the gradual increase of teak tree plantations replacing fallow led to intricate streamflow patterns: pluri-annual streamflow cycles induced by the shifting system, on top of a gradual streamflow increase over years caused by the spread of the plantations. In Vietnam, the abandonment of continuously cropped areas combined with patches of mix-trees plantations led to the natural re-growth of forest communities followed by a gradual drop in streamflow. Soil infiltrability controlled by surface crusting is the predominant process explaining why two modes of afforestation (natural regeneration vs. planting) led to opposite changes in streamflow regime. Given that commercial tree plantations will continue to expand in the humid tropics, careful consideration is needed before attributing to them positive effects on water and soil conservation. © 2016 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78799
Appears in Collections:气候变化事实与影响

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作者单位: International Water Management Institute (IWMI), Southeast Asia Regional Office, Vientiane, Laos; Institut de Recherche pour le Développement (IRD), GET, Université Paul Sabatier, Toulouse, France; IRD, IEES-Paris UMR 242, Université Pierre et Marie-Curie, Sorbonne Universités, Paris, France; IRD, IEES-Paris UMR 242, C/o National Agriculture and Forestry Research Institute (NAFRI), Vientiane, Laos; Soils and Fertilizers Research Institute (SFRI), Hanoi, Viet Nam; IRD, EcoandSols UMR 210, Montpellier SupAgro, Montpellier, France; IRD, IEES-Paris UMR 242, C/o SFRI, Hanoi, Viet Nam; AgroParisTech, Laboratoire d'Étude des Ressources Forêt Bois LERFoB, ENGREF, UMR1092, Nancy, France; University of Arizona, Graduate College, Tucson, United States; Laboratoire des Sciences du Climat et de l'Environnement (LSCE), UMR 8212, C.E. de Saclay, Gif-sur-Yvette, France; Agriculture Land-Use Planning Center (ALUPC), Ministry of Agriculture and Forestry, Vientiane, Laos

Recommended Citation:
Lacombe G,, Ribolzi O,, De Rouw A,et al. Contradictory hydrological impacts of afforestation in the humid tropics evidenced by long-term field monitoring and simulation modelling[J]. Hydrology and Earth System Sciences,2016-01-01,20(7)
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