气候变化领域集成服务门户(CCPortal): Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees

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DOI	10.1016/j.foreco.2018.03.018
	Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees
	Bordron B.; Robin A.; Oliveira I.R.; Guillemot J.; Laclau J.P.; Jourdan C.; Nouvellon Y.; Abreu-Junior C.H.; Trivelin P.C.O.; Gonçalves J.L.M.; Plassard C.; Bouillet J.P.
发表日期	2019
ISSN	0378-1127
起始页码	6
结束页码	16
卷号	431
英文摘要	Functional specialization of fine roots was found for Eucalyptus grandis trees at harvesting age (6 years) on tropical soils. Aiming to elucidate whether functional specialization is a ubiquitous feature of eucalypts, we focused on its changes with ontogeny, tree nutrient status and soil depth. We studied the potential uptake of N, K and Ca by 2-year-old E. grandis trees, as a function of soil depth and NPK fertilization. We injected NO−3-15N, Rb+ (K+ analogue) and Sr2+ (Ca2+ analogue) tracers simultaneously in a solution at depths of 10, 50, 150 and 300 cm in a sandy Ferralsol soil. A complete randomized block design was set up with three replicates of paired trees per injection depth, in fertilized and non-fertilized plots. Recently expanded leaves were sampled at 70 days after tracer injection. Determination of foliar Rb, Sr concentrations and x(15N) allowed estimating the relative uptake potential (RUP) and the specific RUP (SRUP), defined as the ratio between RUP and fine root length density (RLD) in the corresponding soil layer. Various root traits were measured at each depth. Foliar N and K concentrations were higher in fertilized than in non-fertilized trees. The RUP of NO3 –-15N decreased sharply with soil depth and the highest values of the SRUP of NO3 –-15N were found at a depth of 50 cm. The RUP of Rb+ and Sr2+ did not change with soil depth, whilst the SRUP of Rb+ and Sr2+ were higher at the depth of 300 cm than in the topsoil, concomitant with an increase in root diameter and a decrease in root tissue density with depth. The SRUP of Rb+ and Sr2+ at a depth of 300 cm were on average 136 and 61% higher for fertilized trees than for non-fertilized trees, respectively. Fine roots of young E. grandis trees showed contrasting potential uptake rates with soil depth depending on the nutrient. Fertilization increased the uptake rate of Rb+ and Sr2+ by unit of root length in deep soil layers. Functional specialization of fine roots for cations of low mobility depending on depth previously shown at harvesting age also occurs in young E. grandis plantations and increases with fertilization application. This mechanism helps explaining very low amounts of cations lost by leaching in Eucalyptus plantations established in deep tropical soils, even in highly fertilized stands. © 2018 Elsevier B.V.
英文关键词	15N; Deep fine roots; Nutrient uptake potential; Rubidium; Sandy tropical soil; Strontium
语种	英语
scopus关键词	Forestry; Nutrients; Plants (botany); Positive ions; Rubidium; Strontium; Tropics; Eucalyptus grandis; Eucalyptus plantations; Fine roots; NPK fertilization; Nutrient uptake; Tracer injections; Tropical soils; ^15N; Soils; fertilizer application; fine root; functional role; nutrient enrichment; nutrient uptake; nutritional status; physiological response; rubidium; sandy soil; strontium; tree; tropical region; Depth; Eucalyptus Grandis; Injection; Leaves; Roots; Set; Soil; Trees; Eucalyptus; Eucalyptus grandis
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/156419
作者单位	USP-ESALQ, Piracicaba, SP 13400-970, Brazil; CIRAD, UMR Eco&Sols, Montpellier, F-34398, France; Eco&Sols, Univ Montpellier, CIRAD, INRA, IRD, Montpellier SupAgro, Montpellier, France; UNESP, Departamento de Solos e Recursos Ambientais, Universidade Estadual Paulista ‘Júlio de Mesquita Filho’, Botucatu, SP 18610-300, Brazil; USP-CENA, Piracicaba, SP 13416-000, Brazil; INRA, CIRAD, IRD, Montpellier SupAgro, University of Montpellier, UMR Eco&Sols, Montpellier, F34060, France
推荐引用方式 GB/T 7714	Bordron B.,Robin A.,Oliveira I.R.,et al. Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees[J],2019,431.
APA	Bordron B..,Robin A..,Oliveira I.R..,Guillemot J..,Laclau J.P..,...&Bouillet J.P..(2019).Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees.Forest Ecology and Management,431.
MLA	Bordron B.,et al."Fertilization increases the functional specialization of fine roots in deep soil layers for young Eucalyptus grandis trees".Forest Ecology and Management 431(2019).