Leaf N resorption efficiency and litter N mineralization rate have a genotypic tradeoff in a silver birch population

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Mikola , J , Silfver , T , Paaso , U , Possen , B J M H & Rousi , M 2018 , ' Leaf N resorption efficiency and litter N mineralization rate have a genotypic tradeoff in a silver birch population ' , Ecology , vol. 99 , no. 5 , pp. 1227-1235 . https://doi.org/10.1002/ecy.2176

Title: Leaf N resorption efficiency and litter N mineralization rate have a genotypic tradeoff in a silver birch population
Author: Mikola, Juha; Silfver, Tarja; Paaso, Ulla; Possen, Boy J. M. H.; Rousi, Matti
Contributor: University of Helsinki, Ecosystems and Environment Research Programme
University of Helsinki, Ecosystems and Environment Research Programme
University of Helsinki, Environmental Sciences
Date: 2018-05
Language: eng
Number of pages: 9
Belongs to series: Ecology
ISSN: 0012-9658
URI: http://hdl.handle.net/10138/307677
Abstract: Plants enhance N use efficiency by resorbing N from senescing leaves. This can affect litter N mineralization rate due to the C:N-ratio requirements of microbial growth. We examined genotypic links between leaf N resorption and litter mineralization by collecting leaves and litter from 19 Betula pendula genotypes and following the N release of litter patches on forest ground. We found significant genotypic variation for N resorption efficiency, litter N concentration, cumulative three-year patch N-input and litter N release with high broad-sense heritabilities (H-2 = 0.28-0.65). The genotype means of N resorption efficiency varied from 46% to 65% and correlated negatively with the genotype means of litter N concentration, cumulative patch N-input and litter N release. NH4+ yield under patches had a positive genotypic correlation with the cumulative patch N-input. During the first year of litter decomposition, genotypes varied from N immobilization (max 2.71 mg/g dry litter) to N release (max 1.41 mg/g dry litter), creating a genotypic tradeoff between the N conserved by resorption and the N available for root uptake during the growing season. We speculate that this tradeoff is one likely reason for the remarkably wide genotypic range of N resorption efficiencies in our birch population.
Subject: Betula pendula
broad-sense heritability
genotype
leaf litter
mineralization
nitrogen
population
resorption efficiency
resorption proficiency
tradeoff
BETULA-PENDULA
NUTRIENT RESORPTION
SENESCING LEAVES
LIFE-SPAN
NITROGEN
GROWTH
DECOMPOSITION
PATTERNS
TRAITS
FOREST
1181 Ecology, evolutionary biology
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