serapilheira e teores de nutrientes em argissolo sob diferentes manejos no norte do piauí litter and nutrient contents in argisol under different managements in northern piauí
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2010
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Abstract
Este trabalho teve como objetivos avaliar o estoque de serapilheira acumulada e quantificar os teores de N, P, K, Ca e Mg em sistemas agroflorestais com seis (SAF6) e dez (SAF10) anos de adoção, sistema com base ecológica de três anos (SE3), agricultura de corte e queima (ACQ) e floresta nativa (FN) no Município de Esperantina, norte do Piauí. As coletas foram realizadas nos períodos chuvoso e seco do ano 2007, sendo a serapilheira separada nas frações folhas e galhos para a estimativa dos estoques acumulados sobre o solo. Os maiores estoques da fração folhas foram observados na FN (3,8 Mg(t) ha-1), período seco; e da fração galhos no SAF10 (2,2 Mg(t) ha-1), no período chuvoso. Os SAFs apresentaram os maiores teores de nutrientes nas frações da serapilheira e entre os nutrientes, e a concentração de N foi superior à dos demais nutrientes, em ambos os períodos. A estimativa de transferência dos nutrientes pela serapilheira obedeceu à sequência N>Ca>K>P>Mg. Os valores de estoques da serapilheira, teores e aportes de nutrientes nos SAFs evidenciam a contribuição do manejo agroflorestal para a qualidade do solo e a sustentabilidade econômica do sistema.
This work aimed to evaluate litter deposition and quantify contents of N, P, K, Ca and Mg in agroforest systems six (AFS6) and ten (AFS10) years after implantation, in three-year old ecological based systems (ES3), slash-and-burn agriculture (SBA) and native forest (NF), all located in Esperantina, northern region of Piauí, Brazil. Collections were carried out in the wet and dry seasons of 2007. The litter was separated into leaves and branches and weighted to estimate the deposition on the soil. The highest leaf depositions were found in NF (3.8 Mg ha-1), in the dry season, whereas for branches, in the AFS10 (2.2 Mg ha-1), in the wet season. AFS showed the highest nutrient contents in the litter fractions, and, among them the N concentration was higher than the others, in both seasons. The estimate transfer of nutrients by the litter followed the sequence N>Ca>K>P>Mg. The values for litter deposition and contents and input of nutrients in the AFS systems show the contribution of the agroforest management to soil quality and the economic sustainability of the system.
This work aimed to evaluate litter deposition and quantify contents of N, P, K, Ca and Mg in agroforest systems six (AFS6) and ten (AFS10) years after implantation, in three-year old ecological based systems (ES3), slash-and-burn agriculture (SBA) and native forest (NF), all located in Esperantina, northern region of Piauí, Brazil. Collections were carried out in the wet and dry seasons of 2007. The litter was separated into leaves and branches and weighted to estimate the deposition on the soil. The highest leaf depositions were found in NF (3.8 Mg ha-1), in the dry season, whereas for branches, in the AFS10 (2.2 Mg ha-1), in the wet season. AFS showed the highest nutrient contents in the litter fractions, and, among them the N concentration was higher than the others, in both seasons. The estimate transfer of nutrients by the litter followed the sequence N>Ca>K>P>Mg. The values for litter deposition and contents and input of nutrients in the AFS systems show the contribution of the agroforest management to soil quality and the economic sustainability of the system.
| Reference Key |
lima2010revistaserapilheira
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|---|---|
| Authors | ;Sandra Santana de Lima;Luiz Fernando Carvalho Leite;Adriana Maria de Aquino;Francisco das Chagas Oliveira;Antonio Alberto Jorge Farias Castro |
| Journal | journal of veterinary medical research |
| Year | 2010 |
| DOI |
10.1590/S0100-67622010000100009
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| URL | |
| Keywords |
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