DOI: 10.1029/2017JG004282
Scopus记录号: 2-s2.0-85049785526
论文题名: Dry-Season Greening and Water Stress in Amazonia: The Role of Modeling Leaf Phenology
作者: Manoli G. ; Ivanov V.Y. ; Fatichi S.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1909
结束页码: 1926
语种: 英语
英文关键词: Amazon forest
; Carbon/Water Fluxes
; Drought
; Leaf Phenology
; Modeling
Scopus关键词: age
; carbon flux
; drought
; dry season
; evapotranspiration
; forest
; leaf
; leaf area index
; modeling
; phenology
; photosynthesis
; primary production
; seasonality
; simulation
; water flux
; water stress
; Amazon Basin
; Amazonia
; Chloris
; Thetys
英文摘要: Large uncertainties on the sensitivity of Amazon forests to drought exist. Even though water stress should suppress photosynthesis and enhance tree mortality, a green-up has been often observed during the dry season. This interplay between climatic forcing and forest phenology is poorly understood and inadequately represented in most of existing dynamic global vegetation models calling for an improved description of the Amazon seasonal dynamics. Recent findings on tropical leaf phenology are incorporated in the state-of-the-art eco-hydrological model Thetys & Chloris. The new model accounts for a mechanistic light-controlled leaf development, synchronized dry-season litterfall, and an age-dependent leaf photosynthetic capacity. Simulation results from 32 sites in the Amazon basin over a 15-year period successfully mimic the seasonality of gross primary productivity; evapotranspiration (ET); as well as leaf area index, leaf age, and leaf productivity. Representation of tropical leaf phenology reproduces the observed dry-season greening, reduces simulated gross primary productivity, and does not alter ET, when compared with simulations without phenology. Tolerance to dry periods, with the exception of major drought events, is simulated by the model. Deep roots rather than leaf area index regulation mechanisms control the response to short-term droughts, but legacy effects can exacerbate multiyear water stress. Our results provide a novel mechanistic approach to model leaf phenology and flux seasonality in the tropics, reconciling the generally observed dry-season greening, ET seasonality, and decreased carbon uptake during severe droughts. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113818
Appears in Collections: 气候减缓与适应
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作者单位: Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland; Department of Civil and Environmental Engineering, University of Michigan, Ann Arbor, MI, United States
Recommended Citation:
Manoli G.,Ivanov V.Y.,Fatichi S.. Dry-Season Greening and Water Stress in Amazonia: The Role of Modeling Leaf Phenology[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)