deposição e composição química de serrapilheira em um bosque de sabiá litter deposition and chemical composition under a sabiá canopy
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2010
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Abstract
Objetivou-se avaliar a deposição e composição química de componentes da serrapilheira existente e depositada em um bosque de sabiá (Mimosa caesalpiniifolia Benth). O experimento foi realizado durante o período de agosto de 2006 a julho de 2007. A avaliação da serrapilheira existente e depositada foi realizada a cada 28 dias utilizando-se 20 quadrados de 1 m², alocados aleatoriamente, escolheno novas áreas a cada avaliação. O bosque apresentou plantas com diâmetro média na altura do peito de 26,8 cm. A deposição mensal de matéria orgânica de folhas e ramos no período experimental foi de 15.167 e 3.373 kg/ha, respectivamente, e aumentou no período de maior precipitação, numa relação de 0,30 com o acúmulo, o indica acúmulo maior que a deposição. A proporção de folhas foi de 87% do total da serrapilheira, com médias de 2,9% de nitrogênio e 0,17% de fósforo. A relação carbono/nitrogênio das folhas ficou abaixo de 30, enquanto a de ramos, entre 30 e 40, comprovando melhor qualidade das folhas. Durante o período experimental, a deposição de nitrogênio via serrapilheira foi de aproximadamente 462 kg/ha e a de fósforo, 30 kg/ha. A deposição de serrapilheira é essencial para manutenção da fertilidade do solo em bosques de sabiá e contribui para sua conservação e sustentabilidade.
This research aimed to evaluate the deposition and chemical composition of the components of the existing and deposited litter in a sabiá (Mimosa caesalpiniifolia Benth) canopy. The experiment was carried out from August 2006 to July 2007. The evaluation of the existing and deposited litter was performed every 28 days using 20 squares with 1m² randomly allocated and new areas were chosen for each evaluation. The canopy showed plants with an average diameter of 26.8 cm at breast height. Monthly deposition of organic matter of leaves and branches during the experimental period was 15,167 kg and 3,373 kg/ha, respectively, and it increased during the highest precipitation period, in a 0.30 relationship with the accumulation, indicating higher accumulation than deposition. Leaf proportion was 87% of the total litter, with means of 2.9% of nitrogen and 0.17% of phosphorus. The carbon/nitrogen ratio of leaves was below 30, while carbon/nitrogen ratio of the branches ranged from 30 to 40, proving a better quality for leaves. During the experimental period, deposition of nitrogen through litter was approximately 462 kg/ha and 30 kg/ha for phosphorus. Litter deposition is essential for maintenance of soil fertility in a sabiá canopy and it contributes for conservation and sustainability of the canopy.
This research aimed to evaluate the deposition and chemical composition of the components of the existing and deposited litter in a sabiá (Mimosa caesalpiniifolia Benth) canopy. The experiment was carried out from August 2006 to July 2007. The evaluation of the existing and deposited litter was performed every 28 days using 20 squares with 1m² randomly allocated and new areas were chosen for each evaluation. The canopy showed plants with an average diameter of 26.8 cm at breast height. Monthly deposition of organic matter of leaves and branches during the experimental period was 15,167 kg and 3,373 kg/ha, respectively, and it increased during the highest precipitation period, in a 0.30 relationship with the accumulation, indicating higher accumulation than deposition. Leaf proportion was 87% of the total litter, with means of 2.9% of nitrogen and 0.17% of phosphorus. The carbon/nitrogen ratio of leaves was below 30, while carbon/nitrogen ratio of the branches ranged from 30 to 40, proving a better quality for leaves. During the experimental period, deposition of nitrogen through litter was approximately 462 kg/ha and 30 kg/ha for phosphorus. Litter deposition is essential for maintenance of soil fertility in a sabiá canopy and it contributes for conservation and sustainability of the canopy.
| Reference Key |
freire2010revistadeposio
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| Authors | ;Joelma de Lira Freire;José Carlos Batista Dubeux Júnior;Mario de Andrade Lira;Rinaldo Luiz Caraciolo Ferreira;Mércia Virginia Ferreira dos Santos;Erinaldo Viana de Freitas |
| Journal | european journal of lipid science and technology |
| Year | 2010 |
| DOI |
10.1590/S1516-35982010000800005
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| URL | |
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