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采用分解袋的方法 ,研究了云南松、滇青冈和元江栲枯叶在针、阔叶林两种生境下的分解及养分动态变化规律。结果表明 ,滇青冈和元江栲枯叶分解速率高于云南松针叶。在阔叶林下这些枯叶的分解系数 (0 55～ 0 6 1a- 1 )要比在云南松林下的 (0 50～ 0 53a- 1 )高。在分解过程中 3种枯叶的N、Al、Fe、Zn元素含量表现出分解前期富积 ,后期释放的特征 ,P、Ca元素在阔叶林地的分解中也有富积过程。而Mg、K元素的浓度与绝对量在分解初期迅速降低后呈缓慢变化的情况。分解中两种阔叶的养分迁移率均高于云南松针叶 ,在阔叶林生境中 3种枯叶的大多数养分元素的富积时间缩短 ,下降幅度和分解速度加快 ,说明阔叶林生境有利于枯落叶的分解和养分元素的循环。
Using the method of decomposition bags, the dynamic changes of the decomposed and nutrient under the habitats of Pinus yunnanensis, Cyclobalanopsis glauca and Ulmus pumila in the habitats of needles and broadleaf forests were studied. The results showed that the decomposition rate of dead leaves in Cyclobalanopsis glauca and Yuanjiang was higher than that in Pinus yunnanensis. The decomposition coefficients of these dead leaves (0 55 ~ 0 6 1a-1) in the broad-leaved forest were higher than those (0 50 ~ 533-1) in the Yunnan pine forest. The contents of N, Al, Fe and Zn in the three kinds of dead leaves showed the characteristics of early decomposition and later release in the decomposition process. P and Ca also accumulated in the decomposition of broadleaf forestland. However, the concentrations and absolute amounts of Mg, K elements slowly changed after the initial decomposition. In the decomposition, the nutrient mobility of the two broadleaf leaves was higher than that of Pinus yunnanensis. The enrichment time of most nutrient elements of the three kinds of dead leaves in the broadleaf forest habitat was shortened, and the decline and decomposition rate were accelerated, Is conducive to the decomposition of litter and nutrient elements of the cycle.