Nutrients in Senesced Leaves: Comment

Craine, Joseph M.; Mack, Michelle C.

doi:10.2307/176800

Cited by 11 publications

(13 citation statements)

References 7 publications

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“…The ranges of resorption efficiency and proficiency values reported here correspond with published reviews of efficiency (Aerts and Chapin 2000) and proficiency (Craine and Mack 1998) data. However, mean leaf N (0.8% d.w.) and P (0.05% d.w.) concentrations at the oldest site were unusually low on a global basis (Aerts and Chapin 2000), but were comparable with leaf nutrient concentrations from retrogressive forest at Cooloola, Australia (Walker et al 1981) and nutrient-poor soils in Hawaii (Vitousek et al 1995).…”

Section: Leaf and Litter Nutrient Concentrationssupporting

confidence: 83%

“…Resorption efficiency is the proportion of fresh leaf nutrients resorbed prior to leaf fall; these data were calculated for each individual sampled. Efficiency and proficiency provide complementary insights into the process of resorption (Killingbeck 1996;Craine and Mack 1998;Van Heerwaarden et al 2003) and so both have been presented here.…”

Section: Data Collectionmentioning

confidence: 99%

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Rapid development of phosphorus limitation in temperate rainforest along the Franz Josef soil chronosequence

et al. 2004

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The aim of this study was to examine how shifts in soil nutrient availability along a soil chronosequence affected temperate rainforest vegetation. Soil nutrient availability, woody plant diversity, composition and structure, and woody species leaf and litter nutrient concentrations were quantified along the sequence through ecosystem progression and retrogression. In this super-wet, high leaching environment, the chronosequence exhibited rapid soil development and decline within 120000 years. There were strong gradients of soil pH, N, P and C, and these had a profound effect on vegetation. N:P(leaf) increased along the chronosequence as vegetation shifted from being N- to P- limited. However, high N:P(leaf) ratios, which indicate P-limitation, were obtained on soils with both high and low soil P availability. This was because the high N-inputs from an N-fixing shrub caused vegetation to be P-limited in spite of high soil P availability. Woody species nutrient resorption increased with site age, as availability of N and P declined. Soil P declined 8-fold along the sequence and P resorption proficiency decreased from 0.07 to 0.01%, correspondingly. N resorption proficiency decreased from 1.54 to 0.26%, corresponding to shifts in mineralisable N. Woody plant species richness, vegetation cover and tree height increased through ecosystem progression and then declined. During retrogression, the forest became shorter, more open and less diverse, and there were compositional shifts towards stress-tolerant species. Conifers (of the Podocarpaceae) were the only group to increase in richness along the sequence. Conifers maintained a lower N:P(leaf) than other groups, suggesting superior acquisition of P on poor soils. In conclusion, there was evidence that P limitation and retrogressive forests developed on old soils, but N limitation on very young soils was not apparent because of inputs from an abundant N-fixing shrub.

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Section: Leaf and Litter Nutrient Concentrationssupporting

confidence: 83%

Section: Data Collectionmentioning

confidence: 99%

Rapid development of phosphorus limitation in temperate rainforest along the Franz Josef soil chronosequence

et al. 2004

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“…For cases where there were no significant differences between life forms in slope and intercept, we only report estimates of the common slope and intercept for all life forms. We also differentiate between resorption proficiency of an individual, i.e., [nutrient] sen , and the potential resorption proficiency (sensu Killingbeck 1996) of a functional group, which is an estimate of the lowest levels to which nutrients are reduced in senesced leaves for the functional group as a whole (Craine and Mack 1998). We used quantile regressions to quantify how ultimate potential N and P resorption proficiencies changed with green leaf nutrient concentrations.…”

Section: Discussionmentioning

confidence: 99%

Nutrient resorption patterns of plant functional groups in a tropical savanna: variation and functional significance

et al. 2008

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Green and senesced leaf nitrogen (N) and phosphorus (P) concentrations of different plant functional groups in savanna communities of Kruger National Park, South Africa were analyzed to determine if nutrient resorption was regulated by plant nutritional status and foliar N:P ratios. The N and P concentrations in green leaves and the N concentrations in senesced leaves differed significantly between the dominant plant functional groups in these savannas: fine-leaved trees, broad-leaved trees and grasses. However, all three functional groups reduced P to comparable and very low levels in senesced leaves, suggesting that P was tightly conserved in this tropical semi-arid savanna ecosystem. Across all functional groups, there was evidence for nutritional control of resorption in this system, with both N and P resorption efficiencies decreasing as green leaf nutrient concentrations increased. However, specific patterns of resorption and the functional relationships between nutrient concentrations in green and senesced leaves varied by nutrient and plant functional group. Functional relationships between N concentrations in green and senesced leaves were indistinguishable between the dominant groups, suggesting that variation in N resorption efficiency was largely the result of inter-life form differences in green leaf N concentrations. In contrast, observed differences in P resorption efficiencies between life forms appear to be the result of both differences in green leaf P concentrations as well as inherent differences between life forms in the fraction of green leaf P resorbed from senescing leaves. Our results indicate that foliar N:P ratios are poor predictors of resorption efficiency in this ecosystem, in contrast to N and P resorption proficiencies, which are more responsive to foliar N:P ratios.

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“…These species were first classified as either deciduous (DB) or evergreen species. Since many leaf traits vary continuously with leaf life span (Reich et al, 1992;Wright et al, 2004), Craine and Mack (1998) argued that evergreen species with a short leaf life span (<1.5 years) might be more similar to deciduous species than to evergreen species with longer life span (>1.5 years). Therefore, based on a previous leaf longevity study in this area (Wang et al, 2000), we further divided the evergreen species into two age classes: broad-leaved evergreen species with life span <1.5 years (EBS) and those with life span >1.5 years (EBL).…”

Section: Study Area and Species Classificationmentioning

confidence: 99%

Leaf nutrient concentration, nutrient resorption and litter decomposition in an evergreen broad-leaved forest in eastern China

Jian

Wang

Yan

2007

Forest Ecology and Management

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Nutrients in Senesced Leaves: Comment

Cited by 11 publications

References 7 publications

Rapid development of phosphorus limitation in temperate rainforest along the Franz Josef soil chronosequence

Rapid development of phosphorus limitation in temperate rainforest along the Franz Josef soil chronosequence

Nutrient resorption patterns of plant functional groups in a tropical savanna: variation and functional significance

Leaf nutrient concentration, nutrient resorption and litter decomposition in an evergreen broad-leaved forest in eastern China

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