间伐对杉木叶凋落物和细根分解的影响  

Effects of thinning on leaf litter and fine root decomposition in Cunninghamia lanceolata plantations

作　　者：余士香 黄凤生 成向荣[2] Yu Shixiang;Hang Fengsheng;Cheng Xiangrong(Kaihua Forestry Bureau of Zhejiang, Kaihua 324300, China;Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, China)

机构地区：[1]浙江省开化县林业局,324300 [2]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《华东森林经理》2018年第1期14-17,20,共5页East China Forest Management

基　　金：中央级公益性科研院所基本科研业务费专项资助(CAFYBB2014QB013)

摘　　要：在浙江省开化县林场间伐2年后的杉木林分内,开展了长达24个月的叶凋落物和细根分解试验。结果表明:分解试验前叶凋落物和细根总有机碳、总氮、总磷和总钾含量在未间伐、中度间伐和强度间伐处理之间均没有显著差异;叶凋落物和细根的分解速率随间伐强度增加而增大,但细根平均腐解率低于叶凋落物。中度和强度间伐处理叶凋落物平均腐解率比未间伐处理高13.0%和35.1%,细根平均腐解率比未间伐处理高31.7%和44.9%,表明间伐更有利于细根的分解。这些研究结果有利于深入认识间伐对杉木人工林养分循环过程的影响,也对杉木人工林经营管理提供了参考。Experiment of leaf litter and fine root decomposition was carried out for24months inCunninghamia lanceolata plantations which was thinned two years ago,in the forest farm of Kaihua County,Zhejiang Province.Results showed that the contents of total organic carbon,total nitrogen,total phosphorusand total potassium in the leaf litter and fine root were no significant difference between the unthinned,moderate thinned and heavy thinned treatments before the experiment.The rate of leaf litter and fine rootdecomposition increased with the increase of thinning intensity,while the average decomposition rate of fineroot was lower than that of leaf litter.The average decomposition rate of leaf litter in the moderate and heavythinned treatments was higher than that in the unthinned treatment by13.0%and35.1%,respectively;andthe average decomposition rate of fine roots was higher than that in the unthinned treatment by31.7%and44.9%,respectively.This indicates that thinning is beneficial to fine roots turnover.These findings areconducive to a deep understanding of the effect of thinning on the nutrient cycling in C.lanceolataplantations,and provide a guide for the management of C.lanceolata plantations.

关 键 词：间伐 杉木 叶凋落物 细根 

分 类 号：S718.554.2[农业科学—林学]