DOI: 10.1016/j.foreco.2014.05.032
Scopus记录号: 2-s2.0-84902255788
论文题名: Dominant clonal Eucalyptus grandis×urophylla trees use water more efficiently
作者: Otto M.S.G. ; Hubbard R.M. ; Binkley D. ; Stape J.L.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2014
卷: 328 起始页码: 117
结束页码: 121
语种: 英语
英文关键词: Biomass increment
; Eucalyptus grandis×urophylla
; Resource use efficiency
; Sap flow
Scopus关键词: Cloning
; Efficiency
; Irrigation
; Soils
; Water supply
; Wood
; Clones of Eucalyptus
; Eucalyptus grandis
; High productivity
; Northeastern Brazil
; Resource use
; Sap flow
; Sap flow sensors
; Water-use efficiency
; Forestry
; clone
; dominance
; growth rate
; sap flow
; stand dynamics
; tree
; water supply
; water use
; Biomass
; Eucalyptus Grandis
; Forestry
; Irrigation
; Soil
; Water Supply
; Wood
; Brazil
英文摘要: Wood growth in trees depends on the acquisition of resources, and can vary with tree size leading to a variety of stand dynamics. Typically, larger trees obtain more resources and grow faster than smaller trees, but while light has been addressed more often, few case studies have investigated the contributions of water use and water use efficiency (WUE) within stands to isolate the tree-size dominance effect. Our sites were located near the cities of Aracruz and Eunapolis in Northeastern Brazil. We measured tree biomass growth, water use and WUE to explore patterns of growth among dominant and non-dominant trees in rainfed (1350mmyr-1) and irrigated experimental stands in two high productivity tropical clones of Eucalyptus grandis×urophylla growing in clayey Ultisol soils. During the study period, irrigation supplied an additional 607mm and 171mm at the Aracruz and Eunapolis sites respectively. We tested two hypotheses; (1) larger trees transpire more water, and produce more wood per water used (higher water use efficiency, WUE) than smaller trees of the same clone and; (2) this pattern also applies if a water surplus is added via irrigation to alleviate water stress.Across both sites, we measured stand water use using sap flow sensors from August to December, and quantified wood growth on a tree-basis and then derived WUE, in kg wood per m3 of water transpired. Dominant trees showed higher rates of tree growth, water use and WUE than dominated trees for the two sites-clones and under both water supply regimes. Using the rainfed trees at Aracruz as an example, 50-kg trees grew 1.0kgmonth-1 compared with growth of 100-kg trees of 3.8kgmonth-1. The smaller trees would use water in a rate of 2.1m3month-1, compared with 3.1m3month-1 for the larger trees, demonstrating a higher WUE for the larger tree (1.2kgm-3 versus 0.5kgm-3). Our results suggest that manipulating stand density on heterogeneous stands, e.g. thinning, has the potential to minimize the tradeoffs between wood growth and tree water use in Eucalyptus grandis×urophylla plantations, mainly in tropical regions with seasonal water deficit. However, more research is needed to discern the underlying mechanisms responsible for higher WUE exhibited by dominant trees and distinct clones. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65851
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Plant Physiology and Biochemistry, University of Sao Paulo, P.O. Box 9, Piracicaba, SP 13418-970, Brazil; USDA Forest Service Rocky Mountain Research Station, 240 W Prospect, Fort Collins, CO 80526, United States; Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO 80523, United States; Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695-8008, United States; Dept. Forest Science, University of Sao Paulo, Piracicaba, SP 13418-970, Brazil
Recommended Citation:
Otto M.S.G.,Hubbard R.M.,Binkley D.,et al. Dominant clonal Eucalyptus grandis×urophylla trees use water more efficiently[J]. Forest Ecology and Management,2014-01-01,328