杉木与楠木叶凋落物混合分解及其养分动态

采用网袋法研究了杉木和楠木叶凋落物以不同比例的混合分解及其养分动态，结果表明：杉木与楠木叶凋落物混合处理的分解速率和K释放率基本上均大于单独的纯杉木和纯楠木，而N和P释放率则介于单独的纯杉木和纯楠木之间；杉楠混合分解可加快了混合中杉木叶凋落物的分解速率和N、K两元素的释放率，并且随楠木叶比例的增加，促进作用越明显；混合分解对混合处理的分解速率和K元素释放有明显的促进作用，而对N、P元素的释放影响不明显。

Decomposition characteristics and its nutrient dynamics of leaf litter mixtures of both Chinese fir and Phoeba bournei

Chinese fir,which is deemed as one of the most important species of timber sourced at plantations around Southern China,has shown under extensive research that due to slower decomposition of Chinese fir leaves,the level of soil fertility has diminished considerably within the region.Research has been carried out to investigate the following: (1) whether the mixture of Chinese fir and Phoeba bournei will increase decomposition rates of Chinese fir litter, and (2) whether interactions exist in decomposition rates and show any nutrient releases whilst being mixed and decomposed. The experimental investigation carried out are as follows: (a) single leaf litter of Chinese fir, (b)single leaf litter of Phoeba bournei, (c) mixture of leaf litter,75% Chinese fir and 25% Phoeba bournei, (d) mixture of leaf litter,50% Chinese fir and 50% Phoeba bournei, (e) mixture of leaf litter,25% Chinese fir and 75% Phoeba bournei.Under extensive research and field investigations,it has found that the decomposition rate of leaf litter mixtures between Chinese fir and Phoeba bournei are a lot faster than singular materials and the K release rate is quicker also,however,N and P release rates differ between both singular materials.Leaf litter,when mixed(Chinese fir and Phoeba bournei),accelerates the decomposition rate of Chinese fir litter,even more so when the Phoeba bournei is added in greater quantities,the decomposition rate , N and K release rates of Chinese fir litter show significant proportions of increase.The decomposition rate and K release rate are significantly increased when both materials are mixed together,however,novisible increase is found in the form of N or P.