DOI: 10.1016/j.foreco.2013.03.003
Scopus记录号: 2-s2.0-84875785030
论文题名: Transpiration and annual water balance of Aleppo pine in a semiarid region: Implications for forest management
作者: Ungar E.D. ; Rotenberg E. ; Raz-Yaseef N. ; Cohen S. ; Yakir D. ; Schiller G.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2013
卷: 298 起始页码: 39
结束页码: 51
语种: 英语
英文关键词: Climate change
; Evapotranspiration
; Forest water balance
; Pinus halepensis
; Sap flow
; Thinning
Scopus关键词: Environmental conditions
; Evapotranspiration loss
; Management implications
; Pinus halepensis
; Potential evapotranspiration
; Sap flow
; Thinning
; Water balance
; Arid regions
; Climate change
; Drought
; Ecosystems
; Evapotranspiration
; Rain
; Soil moisture
; Transpiration
; Vegetation
; Water supply
; Forestry
; climate change
; coniferous tree
; evapotranspiration
; forest management
; sap flow
; semiarid region
; soil water
; thinning
; transpiration
; understory
; water budget
; Climates
; Drought
; Ecosystems
; Forest Management
; Israel
; Pinus Brutia
; Pinus Halepensis
; Rain
; Sap
; Thinning
; Transpiration
; Water
; Water Supply
; Israel
; Negev
; Southern District
; Pinus halepensis
英文摘要: Transpiration is a fundamental datum in understanding the ecophysiology of planted forests in dry regions and is central to the construction of an ecosystem-level water balance. The present aims were: (i) to measure daily transpiration in a dryland Pinus halepensis Mill. (Aleppo pine) forest and to examine its relationship to environmental conditions such as soil water content and evaporative demand; (ii) to determine the seasonal and annual water balances of the ecosystem; and (iii) to explore management implications in the context of a climate-change scenario of increasing aridity. The study was conducted in the Yatir forest (300treesha-1) in Israel's semiarid northern Negev, during three consecutive years (starting 2003/4) in which rainfall (R) was 231, 334 and 224mm, the last designated a drought because of relatively long dry spells between major rain events. Tree transpiration was measured by the heat-pulse method and values were upscaled to the forest canopy level. Independent estimates were obtained for daily ecosystem-level evapotranspiration (ET), and soil and understory vegetation evapotranspiration (E). Daily canopy-level transpiration rate (T) ranged from 0.1 to 1.6mmd-1 and showed a highly dynamic and irregular pattern during the rainy season. For the two non-drought years a large part of the variation in T could be attributed to the following simple relationships. When soil water content (SWC) ≤0.15m3m-3, the primary driver of T was SWC; regression of T on SWC yielded highly significant quadratic relationships indicating little response below SWC of approximately 0.12m3m-3, and a steep linear response above it. For SWC >0.15m3m-3, potential evapotranspiration (PET) was of paramount importance; quadratic regression of T on PET yielded highly significant relationships and explained a high proportion of the variance in T. During the wet season (215d), on average, cumulative ET (201mm) accounted for 0.76 R (R=263mm) and cumulative T (116mm; range 103-126mm) - an independently estimated component of cumulative ET - accounted for 0.45 R. Cumulative E was 70mm. On an annual basis, total evapotranspiration losses were approximately equal to R, with 58% exiting the system via the trees and 39% via soil and undergrowth vegetation. Water balance data combined with assumptions regarding tree minimum transpiration led to a first approximation of sustainable forest density. This approach indicated that the Yatir forest should be thinned to stands of 250 or 190treesha-1 in order to remain sustainable under annual rainfall regimes of 200 or 150mm, respectively. © 2013 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66634
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Natural Resources, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel; Department of Environmental Sciences and Energy Research, Weizmann Institute of Science, Rehovot 76100, Israel; Department of Environmental Physics and Irrigation, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Recommended Citation:
Ungar E.D.,Rotenberg E.,Raz-Yaseef N.,et al. Transpiration and annual water balance of Aleppo pine in a semiarid region: Implications for forest management[J]. Forest Ecology and Management,2013-01-01,298