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| Titel |
Regional effects of vegetation restoration on water yield across the Loess Plateau, China |
| VerfasserIn |
X. M. Feng, G. Sun, B. J. Fu, C. H. Su, Y. Liu, H. Lamparski |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 8 ; Nr. 16, no. 8 (2012-08-10), S.2617-2628 |
| Datensatznummer |
250013416
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| Publikation (Nr.) |
 copernicus.org/hess-16-2617-2012.pdf |
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| Zusammenfassung |
| The general relationships between vegetation and water
yield under different climatic regimes are well established at a small
watershed scale in the past century. However, applications of these basic
theories to evaluate the regional effects of land cover change on water
resources remain challenging due to the complex interactions of vegetation
and climatic variability and hydrologic processes at the large scale. The
objective of this study was to explore ways to examine the spatial and
temporal effects of a large ecological restoration project on water yield
across the Loess Plateau region in northern China. We estimated annual water
yield as the difference between precipitation input and modelled actual
evapotranspiration (ET) output. We constructed a monthly ET model using
published ET data derived from eddy flux measurements and watershed
streamflow data. We validated the ET models at a watershed and regional
levels. The model was then applied to examine regional water yield under
land cover change and climatic variability during the implementation of the
Grain-for-Green (GFG) project during 1999–2007. We found that water yield in
38% of the Loess Plateau area might have decreased (1–48 mm per year) as
a result of land cover change alone. However, combined with climatic
variability, 37% of the study area might have seen a decrease in water
yield with a range of 1–54 mm per year, and 35% of the study area might
have seen an increase with a range of 1–10 mm per year. Across the study
region, climate variability masked or strengthened the water yield response
to vegetation restoration. The absolute annual water yield change due to
vegetation restoration varied with precipitation regimes with the highest in
wet years, but the relative water yield changes were most pronounced in dry
years. We concluded that the effects of land cover change associated with
ecological restoration varied greatly over time and space and were strongly
influenced by climatic variability in the arid region. The current regional
vegetation restoration projects have variable effects on local water
resources across the region. Land management planning must consider the
influences of spatial climate variability and long-term climate change on
water yield to be more effective for achieving environmental sustainability. |
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