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以辽宁东部地区天然次生林的典型林型-柞树为主的杂木林为研究对象,在不同间伐强度的杂木林内采取埋置分解袋并定期观测的方法研究林分凋落物的分解规律。观测结果表明:辽东天然次生林凋落物分解过程存在着明显的季节变化,可划分为4个时期;用Olson指数衰减模型拟合了凋落物分解的年度变化动态,凋落物在刚凋落的前3年分解迅速,分解率50%以上。3年以后分解速率明显下降;杂木林内凋落物分解速度随间伐强度的增大而减小,间伐后湿度变小是主要原因;凋落物分解速度和林分凋落量的动态消长过程决定凋落物贮量和土壤养分状况,弱度间伐林分和未间伐林分凋落物贮量、表层土壤有机质含量明显高于中度间伐林分和强度间伐林分。
Taking the typical oak forest of oak secondary forest in the eastern Liaoning as an example, the decomposition law of litterfalls was studied by embedding decomposition bags and regular observation in the mixed wood with different thinning intensity. The observation results show that there are obvious seasonal changes of litter decomposition in the natural secondary forest of Liaodong, which can be divided into four periods. The annual variation of litter decomposition was fitted by Olson index decay model. Before the litterfall litter, Decomposition quickly, the decomposition rate of 50% or more. The rate of decomposition of litter decreased with the increase of thinning intensity and the humidity decreased after thinning. The dynamic decline of litter decomposition and stand litter determined the litter Storage and soil nutrient status, the thinned stand and the litterfall stocked without unfractionation stand, the content of soil organic matter in the surface soil was significantly higher than that of the middle stand and the intermediate stand.