SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES

Resorption of nutrients from senescing tissues is an important aspect of the nutrient economy of perennial plants, and a major influence on ecosystem nutrient dynamics. Attempts to interpret the adaptive significance of variation in nutrient resorption efficiency have met with little success, leadin...

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Autores principales:	Lusk,Christopher H., Matus,Francisco, Moreno-Chacón,María, Saldaña,Alfredo, Jiménez-Castillo,Mylthon
Lenguaje:	English
Publicado:	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción 2003
Materias:	Nitrogen nutrient cycling phosphorus plant nutrition resorption
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100006
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spelling	oai:scielo:S0717-664320030001000062004-02-04SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREESLusk,Christopher H.Matus,FranciscoMoreno-Chacón,MaríaSaldaña,AlfredoJiménez-Castillo,Mylthon Nitrogen nutrient cycling phosphorus plant nutrition resorption Resorption of nutrients from senescing tissues is an important aspect of the nutrient economy of perennial plants, and a major influence on ecosystem nutrient dynamics. Attempts to interpret the adaptive significance of variation in nutrient resorption efficiency have met with little success, leading some scientists to emphasize the need for more work on the biochemical and physiological basis of resorption. One hypothesis suggests than variation in resorption is controlled by sink-source effects within the plant. According to this hypothesis, we might expect resorption to be positively correlated with plant growth rates. This could be expected not only for comparisons among species or populations, but also when comparing conspecific individuals growing at different rates, or the same plant during different phases of the annual growth cycle. We measured seasonal variation in leaf litter nitrogen and phosphorous concentrations of four evergreen tree species of the Valdivian rainforest, and tested predictions of the sink hypothesis. Relatively low mean N:P ratios of litter (ranging from 5.5 to 9.9 among the four species) suggest nitrogen limitation of tree growth. N and P concentrations showed nearly twofold seasonal variation in all four species. All species showed low resorption proficiency (high litter [N]) in winter, consistent with the sink-source hypothesis. However, most species showed their lowest litter concentrations of both nutrients (highest resorption proficiency) in autumn. As growth sink strength should be low in autumn, this finding appears to be inconsistent with the sink hypothesisinfo:eu-repo/semantics/openAccessFacultad de Ciencias Naturales y Oceanográficas, Universidad de ConcepciónGayana. Botánica v.60 n.1 20032003-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100006en10.4067/S0717-66432003000100006
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Nitrogen nutrient cycling phosphorus plant nutrition resorption
spellingShingle	Nitrogen nutrient cycling phosphorus plant nutrition resorption Lusk,Christopher H. Matus,Francisco Moreno-Chacón,María Saldaña,Alfredo Jiménez-Castillo,Mylthon SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
description	Resorption of nutrients from senescing tissues is an important aspect of the nutrient economy of perennial plants, and a major influence on ecosystem nutrient dynamics. Attempts to interpret the adaptive significance of variation in nutrient resorption efficiency have met with little success, leading some scientists to emphasize the need for more work on the biochemical and physiological basis of resorption. One hypothesis suggests than variation in resorption is controlled by sink-source effects within the plant. According to this hypothesis, we might expect resorption to be positively correlated with plant growth rates. This could be expected not only for comparisons among species or populations, but also when comparing conspecific individuals growing at different rates, or the same plant during different phases of the annual growth cycle. We measured seasonal variation in leaf litter nitrogen and phosphorous concentrations of four evergreen tree species of the Valdivian rainforest, and tested predictions of the sink hypothesis. Relatively low mean N:P ratios of litter (ranging from 5.5 to 9.9 among the four species) suggest nitrogen limitation of tree growth. N and P concentrations showed nearly twofold seasonal variation in all four species. All species showed low resorption proficiency (high litter [N]) in winter, consistent with the sink-source hypothesis. However, most species showed their lowest litter concentrations of both nutrients (highest resorption proficiency) in autumn. As growth sink strength should be low in autumn, this finding appears to be inconsistent with the sink hypothesis
author	Lusk,Christopher H. Matus,Francisco Moreno-Chacón,María Saldaña,Alfredo Jiménez-Castillo,Mylthon
author_facet	Lusk,Christopher H. Matus,Francisco Moreno-Chacón,María Saldaña,Alfredo Jiménez-Castillo,Mylthon
author_sort	Lusk,Christopher H.
title	SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
title_short	SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
title_full	SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
title_fullStr	SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
title_full_unstemmed	SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES
title_sort	seasonal variation in leaf litter nutrient concentrations of valdivian rainforest trees
publisher	Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción
publishDate	2003
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432003000100006
work_keys_str_mv	AT luskchristopherh seasonalvariationinleaflitternutrientconcentrationsofvaldivianrainforesttrees AT matusfrancisco seasonalvariationinleaflitternutrientconcentrationsofvaldivianrainforesttrees AT morenochaconmaria seasonalvariationinleaflitternutrientconcentrationsofvaldivianrainforesttrees AT saldanaalfredo seasonalvariationinleaflitternutrientconcentrationsofvaldivianrainforesttrees AT jimenezcastillomylthon seasonalvariationinleaflitternutrientconcentrationsofvaldivianrainforesttrees
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SEASONAL VARIATION IN LEAF LITTER NUTRIENT CONCENTRATIONS OF VALDIVIAN RAINFOREST TREES

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