Dinâmica da fauna do solo em função da decomposição de diferentes combinações de leguminosas em um sistema de cultivo em aléias

Abstract

The aim of this study was to evaluate the composition of soil fauna under different green manure, the composition time epigeous fauna during decomposition of different combinations of legumes tree, assess what treatment had higher rates of decomposition and release of nitrogen in the system and the correlation between the variable number of mites and springtails, amount of nitrogen and polyphenol, the C /

N and rainfall. The alley crop system was implanted using two species with high- quality of residues Leucaena leucocephala and Cajanus cajan and two species of

low quality Clitoria fairchildiana and Acacia mangium. These green manure were combined forming the following treatments: Clitoria + Cajanus (S+G); Leucaena + Cajanus (L+G); Acacia + Cajanus (A+G); Clitoria + Leucaena (S+L); Leucaena + Acacia (L+A) and the controlTo evaluate the quality of green manure, has been used the method of the litter bag. In each bag was placed 20 g of leaves of two leguminous combined and distribuited their respective treatments. The bags were removed from the experiment with 3, 6, 10, 15, 30, 60 and 90 days after pruning of treesTo capture the soil fauna was held eight evaluations, taking as reference the date of tree pruning: 2 (two days before pruning), 3, 6, 10, 15, 30, 60 and 90 days after pruning. In each treatment were placed two traps (pit fali), with 1 m distance between them, buried in soil. The organisms were identified in major taxonomic groups. Regarding the mite fauna and springtails were most abundant in all samples and the highest diversity was found 60 days after pruning. It was a great activity to understand all treatments probably due to the search for better food or shelter as the complex microhabitas provided by treatments with the material of slow decomposition. The combination of legumes L + G has the largest set of decomposition and has a faster release of N in the soil.