江西省不同林型下枯枝落叶分解和养分释放的动态

A STUDY ON LITTER DECOMPOSITION AND THE DYNAMIC STATE OF NUTRIENT RELEASE OF DIFFERENT TYPES OF FOREST IN JIANGXI PROVINCE

研究表明：（１）江西省不同林型的枯枝落叶分解损失率表现为常绿阔叶林＞杉阔混交林＞纯杉木林，其可用数学模型进行描述。（２）在枯枝落叶的分解过程中，其Ｋ的含量不断下降，其它养分的含量则不断上升；随着分解的进行，所有营养元素的损失率都不断增加，损失率最大的为Ｋ，Ｃａ，Ｎ，Ｍｇ等元素。（３）分解过程中，不同林型的枯枝落叶中营养元素的含量和损失率有明显的差异，始终表现为常绿阔叶林＞杉阔混交林＞纯杉木林。

The results of this study show that:(1)the litter lose rates of different forest types appearas ever-green broad-leavedbrest > ever-green broad-leaved and Chinese Fir mixed forest>Chinese Fir forest in their decomposition processes,which can be described in the model,(2)with the proceeding of the litter decompositinn,the K contents in litter decrease but those of allthe other 10 nutrients increase,meanwhile,the loss rates of alI nutrients increase continuouslywithin which K,Ca,N,and Mg loss most in quantity,(3)in the process of litter decomposi-tion,the contents and foss rates of various nutrients in different forest litter difler remarkably,they always appear as:ever-green broad-leaved forest>ever-green broad-leaved and Chi-nese Fir mixed forest>Cmnese Fir forest.