川东中高山地区红三叶、鸭茅凋落物分解速率与气候因子之间的定量关系

The Relationship Between the Climatic Factors and the Litter Decomposition of Trifolium pratense, Dactylis glomerata in Mountains of Eastern Sichuan.

报道了川东中高山地区人工草地红三叶、鸭茅凋落物的分解速率与气温和降水之间的关系，并建立了动态模型。分析结果表明，气温的升高和降水量的增大都有利于凋落物的分解；季节之间相对分解速率变化较大，７月份相当于３月份的１．５倍；年度相对分解速率波动不大，慢年相当于快年的９７％以上；而年度绝对分解率呈现越来越慢的趋势。据估计，分解９９．５％的凋落物红三叶和鸭茅分别需要２年和３年。

The relationship between the climatic factors and the litter decomposition of 2 species (Trifolium pratense, Dactylis glomerata) in mountains of eastern Sichuan were studied by modelling. The mathematical model is X(t)/X(0)=dxp -(at+bT+cP) , where t is time, X(t) is the weight of the remaining litter at time t, T is air temperature, and P is precipitation. A high temperature and aboundant precipition will result in rapid decomposition. The relative rate of decomposition varied obviorsly in different seasons and the rate in July was found to be 1.5 times of that in March. The annual changes were small and the annual relative dccomposition rate in a slowl decomposition year was not less than 97% of that in a fast decomposition year. The changes in annual absolute decomposition rate were distinct and it became slower as the number of year increasing. A decomposition of 99.5% litter will take 2 years for T. pratense, and 3 years for D. glomerata on an estimated basis.