气候变化领域集成服务门户(CCPortal): Light absorption, light use efficiency and productivity of 16 contrasted genotypes of several Eucalyptus species along a 6-year rotation in Brazil

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DOI	10.1016/j.foreco.2019.06.040
	Light absorption, light use efficiency and productivity of 16 contrasted genotypes of several Eucalyptus species along a 6-year rotation in Brazil
	le Maire G.; Guillemot J.; Campoe O.C.; Stape J.-L.; Laclau J.-P.; Nouvellon Y.
发表日期	2019
ISSN	0378-1127
卷号	449
英文摘要	Stemwood productivity in forest ecosystems depends on the amount of light absorbed by the trees (APAR) and on the Light Use Efficiency (LUE), i.e. the amount of stemwood produced per amount of absorbed light. In fertilized Eucalyptus plantations of Brazil, growth is expected to be strongly limited by light absorption in the first years after planting, when trees can benefit from high soil water stocks, recharged after clearcutting the previous stand. Other limiting factors, such as water or nutrient shortage are thought to increase in importance after canopy closure, and changes in allocation patterns are expected, affecting the LUE. Studying changes in APAR and LUE along a complete rotation is paramount for gaining insight into the mechanisms that drive the inter- and intra-genotype variabilities of productivity and stemwood biomass at the time of harvest. Here, we present a 6-year survey of productivity, APAR and LUE of 16 Eucalyptus genotypes of several species used in commercial plantations and planted in 10 randomized replications in the São Paulo Region, Brazil. APAR was estimated using the MAESTRA tridimensional model parameterized at tree scale for each tree in each plot (a total of 16,000 trees) using local measurements of leaf and canopy properties. Stand growth was estimated based on allometric relationships established through successive destructive biomass measurements at the study site. Allometric relationships predicting biomass of tree components, leaf surface, crown dimension and leaf inclination angle distribution throughout the rotation for the 16 productive genotypes are shown. Results at stand scale showed that (1) LUE increased with stand age for all genotypes, from 0.15 at age 1 yr to 1.70 g MJ−1 at age 6 yrs on average; (2) light absorption was a major limiting factor over the first year of growth (R2 between APAR and stand biomass ranging from 0.5 to 0.95), explaining most of the inter- and intra-genotype growth variability; (3) at rotation scale, the variability of final stemwood biomass among genotypes was in general attributable to other factors than average APAR; (4) differences in stemwood productions among genotypes remained large throughout the rotation; (5) LUEs over the second half of the rotation, rather than initial growth or APAR, was the major driver of stemwood biomass at the time of harvest. © 2019 Elsevier B.V.
英文关键词	Eucalypt clone; Leaf area index; Light interception; Production ecology; Productivity; Tropical plantation
语种	英语
scopus关键词	Biomass; Ecosystems; Efficiency; Light absorption; Productivity; Rotation; Soil moisture; Water absorption; Allometric relationship; Biomass measurements; Biomass of tree components; Commercial plantation; Eucalyptus plantations; Leaf Area Index; Light interception; Tropical plantations; Forestry; biomass; clearcutting; crop rotation; dicotyledon; forest ecosystem; genotype; growth; leaf area index; light intensity; light use efficiency; limiting factor; plantation forestry; soil water; tropical forest; Biomass; Ecosystems; Efficiency; Light Absorption; Productivity; Rotation; Brazil; Sao Paulo [Brazil]; Eucalyptus
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155835
作者单位	CIRAD, UMR Eco&Sols, Montpellier, F-34398, France; UNICAMP, Campinas, SP CEP 13083-860, Brazil; Eco&Sols, Univ Montpellier, CIRAD, INRA, IRD, Montpellier, SupAgro, Montpellier, France; ESALQ, Universidade de São Paulo, Piracicaba, SP CEP 13418-900, Brazil; Federal University of Lavras – UFLA, Lavras, MG CEP 37.200-000, Brazil; UNESP-FCA, Botucatu, SP CEP 18.610-300, Brazil
推荐引用方式 GB/T 7714	le Maire G.,Guillemot J.,Campoe O.C.,et al. Light absorption, light use efficiency and productivity of 16 contrasted genotypes of several Eucalyptus species along a 6-year rotation in Brazil[J],2019,449.
APA	le Maire G.,Guillemot J.,Campoe O.C.,Stape J.-L.,Laclau J.-P.,&Nouvellon Y..(2019).Light absorption, light use efficiency and productivity of 16 contrasted genotypes of several Eucalyptus species along a 6-year rotation in Brazil.Forest Ecology and Management,449.
MLA	le Maire G.,et al."Light absorption, light use efficiency and productivity of 16 contrasted genotypes of several Eucalyptus species along a 6-year rotation in Brazil".Forest Ecology and Management 449(2019).