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| Titel |
Climate change, growing season water deficit and vegetation activity along the north–south transect of eastern China from 1982 through 2006 |
| VerfasserIn |
P. Sun, Z. Yu, S. Liu, X. Wei, J. Wang, N. Zegre, N. Liu |
| 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. 10 ; Nr. 16, no. 10 (2012-10-26), S.3835-3850 |
| Datensatznummer |
250013532
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| Publikation (Nr.) |
 copernicus.org/hess-16-3835-2012.pdf |
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| Zusammenfassung |
| Considerable work has been done to examine the relationship between
environmental constraints and vegetation activities represented by the
remote sensing-based normalized difference vegetation index (NDVI). However,
the relationships along either environmental or vegetational gradients are
rarely examined. The aim of this paper was to identify the vegetation types
that are potentially susceptible to climate change through examining their
interactions between vegetation activity and evaporative water deficit. We
selected 12 major vegetation types along the north–south transect of eastern
China (NSTEC), and tested their time trends in climate change, vegetation
activity and water deficit during the period 1982–2006. The result showed
significant warming trends accompanied by general precipitation decline in
the
majority of vegetation types. Despite that the whole transect increased
atmospheric evaporative demand (ET0) during the study period, the
actual evapotranspiration (ETa) showed divergent trends with ET0
in most vegetation types. Warming and water deficit exert counteracting
controls on vegetation activity. Our study found insignificant greening
trends in cold temperate coniferous forest (CTCF), temperate deciduous shrub
(TDS), and three temperate herbaceous types including the meadow steppe (TMS),
grass steppe (TGS) and grassland (TG), where warming exerted more effect on
NDVI than offset by water deficit. The increasing growing season water
deficit posed a limitation on the vegetation activity of temperate coniferous
forest (TCF), mixed forest (TMF) and deciduous broad-leaved forest (TDBF).
Differently, the growing season brownings in subtropical or tropical forests
of coniferous (STCF), deciduous broad-leaved (SDBF), evergreen broad-leaved
(SEBF) and subtropical grasslands (STG) were likely attributed to
evaporative energy limitation. The growing season water deficit index (GWDI)
has been formulated to assess ecohydrological equilibrium and thus
indicating vegetation susceptibility to water deficit. The increasing GWDI
trends in CTCF, TCF, TDS, TG, TGS and TMS indicated their rising
susceptibility to future climate change. |
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