globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.foreco.2012.07.035
Scopus记录号: 2-s2.0-84869880504
论文题名:
Stem production, light absorption and light use efficiency between dominant and non-dominant trees of Eucalyptus grandis across a productivity gradient in Brazil
作者: Campoe O.C.; Stape J.L.; Nouvellon Y.; Laclau J.-P.; Bauerle W.L.; Binkley D.; Le Maire G.
刊名: Forest Ecology and Management
ISSN:  0378-1127
出版年: 2013
卷: 288
起始页码: 14
结束页码: 20
语种: 英语
英文关键词: Dominance ; Eucalyptus ; MAESTRA model ; Production ecology
Scopus关键词: Array model ; Brazilian eucalyptus ; Dominance ; Dry biomass ; Eucalyptus ; Eucalyptus grandis ; Forest plantation ; Forest productivity ; Individual tree ; Leaf area ; Light use efficiency ; Natural gradient ; Photosynthetically active radiation ; Soil clay content ; Stem production ; Stemwoods ; Tree level ; Wood production ; Ecology ; Efficiency ; Light absorption ; Productivity ; Seed ; Three dimensional ; Wood ; Forestry ; absorption ; biological production ; dominance ; evergreen tree ; forest soil ; growth rate ; land use ; leaf area ; light use efficiency ; photosynthetically active radiation ; plantation forestry ; soil profile ; stem ; topographic effect ; Brazil ; Ecology ; Eucalyptus Grandis ; Light Absorption ; Productivity ; Seeds ; Stems ; Wood ; Brazil ; Eucalyptus ; Eucalyptus grandis
英文摘要: Brazilian Eucalyptus plantations are some of the most productive forest plantations in the world, sustaining mean growth rates of 25Mgha-1year-1 (50m3ha-1year-1) over the 4.7 million hectares planted across the country. To better understand forest productivity, studies at the stand scale need to be coupled with tree level evaluations of the production ecology (the assessment of wood production as a function of crown light absorption and light use efficiency). The soil clay content (≈20% to ≈40%), topography and historical land use of the experimental site generated a natural gradient in productivity. We measured (from 6 to 7years after planting) stem wood dry biomass growth and estimated light absorption and light use efficiency at the tree level with a three-dimensional array model (MAESTRA) in 12 plots within a seed-origin Eucalyptus grandis plantation. We investigated the hypothesis that dominant trees (the 20% largest) are more productive than non-dominant trees (the 20% smallest) as a result of greater light absorption and light use efficiency; and that with increasing productivity across plots, dominant trees would show larger increases in light use and light use efficiency in comparison to non-dominant trees. The 20% smallest of the trees averaged 10.6kg of stem wood dry biomass (1.6kg of stem wood growth during the last year of the rotation), compared with 185kg per stem wood in the 20% largest of trees (34kg of stem wood growth over the same period). The smallest trees contained 7.2% of the leaf area as compared to the largest trees (3.0m2 versus 41.7m2), and they absorbed only 6.7% as much light (2.2 versus 32.8GJyear-1). The smallest trees grew at about 4.7% of the rate of the largest trees, which is a smaller percentage than the difference in absorbed photosynthetically active radiation; therefore the light use efficiency was lower for the smallest trees (0.75kgGJ-1 versus 1.03kgGJ-1). Our results show the significant contribution of dominant trees to stand productivity and the importance of evaluating production ecology at the individual tree scale. © 2012 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/66862
Appears in Collections:影响、适应和脆弱性

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作者单位: Forestry Science and Research Institute - IPEF, Piracicaba, São Paulo 13418-260, Brazil; Department Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695-8008, United States; CIRAD, UMR 111, Ecologie Fonctionnelle and Biogéochimie des Sols and Agro-écosystèmes, F-34060 Montpellier, France; Universidade de São Paulo, Departamento de Ciências Atmosféricas, 05508-900 São Paulo, Brazil; Universidade de São Paulo, Departamento de Ecologia, 05508-900 São Paulo, Brazil; Department of Horticulture and Landscape Architecture, Colorado State University, Fort Collins, CO 80523, United States; Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO 80523, United States

Recommended Citation:
Campoe O.C.,Stape J.L.,Nouvellon Y.,et al. Stem production, light absorption and light use efficiency between dominant and non-dominant trees of Eucalyptus grandis across a productivity gradient in Brazil[J]. Forest Ecology and Management,2013-01-01,288
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