Dinâmica das concentrações de carbono e nitrogênio na decomposição do folhedo de cultivos subtropicais do sudeste da Espanha
DOI:
https://doi.org/10.15359/rca.52-1.10Palavras-chave:
ciclo de nutrientes, folhedo, mediterrâneo, cultivos subtropicaisResumo
A decomposição do folhedo é uma das principais vias de consumo de energia em um ecossistema e um dos pilares básicos no ciclo de nutrientes. Por outro lado, nas últimas décadas, os cultivos subtropicais têm se expandido de forma considerável na costa de Granada (sudeste da Espanha). Para avaliar tais ciclos foi levado a cabo um ensaio com sacolas utilizando para isso folhas da mangueira (Mangifera indica L.), anoneira (Annona cherimola Mill.), abacateiro (Persea americana Mill.) e nespereira (Eriobotrya japonica L.). O objetivo deste trabalho foi realizar um seguimento da dinâmica de decomposição dos folhedos produzidos pela mangueira, pelo abacateiro, pela anoneira e nespereira, e da evolução de seu conteúdo em carbono e nitrogênio em condições de clima mediterrâneo subtropical. As sacolas foram enterradas e retiradas a cada certo tempo para avaliar a concentração de carbono e nitrogênio, como também a perda de massa em cada uma delas. Os resultados deste estudo mostraram, de forma evidente, que os agricultores podem ser beneficiados pelo conhecimento da dinâmica de nutrientes em folhedos para melhorar a matéria orgânica no solo em longo prazo e a incorporação de nitrogênio. Neste sentido, as folhas da nespereira e da mangueira mostraram as maiores taxas de acumulação de nitrogênio e, portanto, a biomassa destas espécies poderia ser utilizada como emenda de tipo orgânico em longo prazo. Já as da anoneira, pelo contrário, acumulou maiores quantidades de carbono do que o resto dos cultivos estudados.
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