Decomposition Rate and C, N Release Dynamics of Mixed Leaf Litters Under Different Artificial Forests
In this study, we selected leaf litters of four planted forests including Cercidiphyllum japonicum, Betula utilis, Pinus yunnansinsis, and Picea asperata as test objects.Their residual rate, total C and N contents, and the release dynamics of C and N at decomposing stage were determined in order to provide the oretical guidance for selecting the best tree species in the experimental area.The results indicated that the decomposition rates of different withered leaves varied significantly.Mixture leaf litters of Picea asperata with Betula utilis, Pinus yunnanensis and Betula utilis, Cercidiphyllum japonicum with Pinus yunnanens showed obvious positive interaction in decomposition.No interaction was observed in those of P.asperata and C.japonicum.Furthermore, the decomposition rate of the mixed leaf litters from broad-leaved forests was larger than that from needle-leaved forests.It is proved that broad-leaved forest stand was propitious to the decomposition of leaf litter.The C contents of littered leaves showed decreasing trends while their C releasing rates increased during the decomposition process.Both the contents and releasing rates of C were higher in needle-leaved forests.In contrast, the N content of leaf litter of the Cercidiphyllum japonicum, the Picea asperata and the Pinus yunnansinsis increased at the beginning then decreased, while that of the B.utilis showed a complex decreasing-increasing-decreasing trend.The mixture of the needle-leaved forests and the broad-leaved forests promoted the releases of C and N from the needle leaf litters.
Cercidiphyllum japonicumBetula utilisPinus yunnansinsisPicea asperataleaf litter decompositionC, N release
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