首页|Litter production and leaf nutrient concentration and remobilization in response to climate seasonality in the central Amazon
Litter production and leaf nutrient concentration and remobilization in response to climate seasonality in the central Amazon
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Litterfall is the largest source of nutrients to for-est soils of tropical rainforests.However,variability in lit-terfall production,nutrient remobilization,and changes in leaf nutrient concentration with climate seasonality remain largely unknown for the central Amazon.This study meas-ured litterfall production,leaf nutrient remobilization,and leaf area index on a forest plateau in the central Amazon.Litterfall was measured at monthly intervals during 2014,while nitrogen,phosphorus,potassium,calcium and mag-nesium concentrations of leaf litter and canopy leaves were measured in the dry and rainy seasons,and remobilization rates determined.Leaf area index was also recorded in the dry and rainy seasons.Monthly litterfall varied from 33.2(in the rainy season)to 87.6 g m-2 in the dry season,while leaf area index increased slightly in the rainy season.Cli-matic seasonality had no effect on concentrations of nitro-gen,calcium,and magnesium,whereas phosphorous and potassium responded to rainfall seasonality oppositely.While phosphorous increased,potassium decreased dur-ing the dry season.Over seasons,nitrogen,potassium,and phosphorous decreased in leaf litter;calcium increased in leaf litter,while magnesium remained unaffected with leaf aging.Regardless,the five nutrients had similar remobiliza-tion rates over the year.The absence of climate seasonality on nutrient remobilization suggests that the current length of the dry season does not alter nutrient remobilization rates but this may change as dry periods become more prolonged in the future due to climate change.
Throughfall Nutrient cyclingClimatic seasonalityLeaf mass per area
Ricardo Antonio Marenco、Saul Alfredo Antezana-Vera、Daniela Pereira Dias、Luiz Antonio Candido
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Instituto Nacional de Pesquisas da Amazônia,Coordenação de Uso da Terra e Mudança Climática,Av.André Araújo 2936,Manaus,AM 69067-375,Brazil
Programa de pós-Graduação em Agricultura no Trópico Úmido,Instituto Nacional de Pesquisas da Amazônia-INPA,Manaus,AM,Brazil
Unidade Acadêmica de Ciências Agrárias,Universidade Federal de Jataí,BR 364,km 195,Jataí,GO 75801-615,Brazil
Ministério da Ciência,Tecnologia e Inova??es(MCTI-INPA,Conselho Nacional de Desenvolvimento Científico e Tecnológico)(CNPq)Funda??o de Amparo à Pesquisa do Estado do Amazonas(FAPEAM)Coordena??o de Aperfei?oamento de Pessoal de Nível Superior
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