Abstract:

In order to find out the effect mechanisms, the effect of different aspect on decomposition of Schima superba and Pinus massoniana litter from mid-subtropical zone were discussed. The results showed that: under 35 a Schima superba and Pinus massoniana plantations, the southeastern slope (No.2 plot) was more conducive to the 4 kinds of litter decomposition. In the 50 a plantation, the decomposition rate of Schima superba leaves and branches in southern slope (No.3 plot) were more quickly, and the decompose of Pinus massoniana branches in east slope (No.4 plot) were faster, however the differences of decomposition rate which caused by different aspect were not reach significant level. The contents of C in the 4 kinds of litter were all gradually reduced over time. N, Ca in the litter occurred different levels of enrichment after a rapid release period (0-62 d), the effects of different aspect on of N, Ca decomposition were more obvious. The P, K, Mg in Schima superba leaves and branches and Pinus massoniana branches-especially Schima superba branches increased greatly and decreased rapidly, the effects of aspect difference in the different periods were very different. Fe, Mn, Cu, Zn in leaves litter, especially Schima superba leaves had suffered different levels of enrichment, the enriched amounts of 4 trace elements in branches, especially Pinus massoniana branches were much smaller. The influence of aspect difference on 4 trace elements decomposition at different periods was more sensitive and complex.