秦岭火地塘天然次生油松林倒木储量与分解  

Storage and Decomposition of Fallen Wood in a Pinus tabulaeformis Secondary Forest at Huoditang Forest Region in the Qinling Mountains

作　　者：袁杰[1] 蔡靖[1,2] 侯琳[1,2] 张硕新[1,2] 

机构地区：[1]西北农林科技大学林学院,杨凌712100 [2]陕西秦岭森林生态系统国家野外科学观测研究站,宁陕711600

出　　处：《林业科学》2012年第6期141-146,共6页Scientia Silvae Sinicae

基　　金：国家林业局林业公益性行业科研专项"秦岭山地森林增汇理水技术体系研究"(201004036)

摘　　要：粗头直径≥10cm,长度通常≥1m,倾斜度超过45°的死木质残体称为倒木（Harmon et al.,1996）。倒木是森林生态系统的重要组成部分,在森林生态系统中倒木与生产者、消费者、分解者之间都有着密切的营养关系,其结构与功能相互制约,相互影响。倒木对森林中生产者的更新有着不容忽视的作用,为各类植物提供了生境,而且还对森林生态系统的演替起着重要的作用（侯平等,2001）;In this study,storage and composition of fallen wood were investigated by sampling in a fixed area plot in a natural secondary Pinus tabulaeforims forest at Huoditang forest region in the Qinling Mountains.The fallen wood mass in the region was 8.25 t · hm-2,of which P.tabulaeformis and Toxicodendron vernicifluum accounted for 69.58% and 30.42%,respectively.The storage of fallen wood investigated according to an international classification showed that the storage of decay class Ⅱ was dominant,accounted for 42.06% of the total,and the storage of decay class Ⅴ accounted for only 8%.The relationship of density and decomposition was simulated by monomial exponential attenuation model,and the decomposition constant of P.tabulaeformis fallen wood was 0.039 93(R2 = 0.981 78),while that of T.vernicifluum fallen wood was 0.045 33(R2 = 0.982 68).The monomial exponential attenuation model predicted that it would take 17 and 75 years to decompose 50% and 95% of P.tabulaeformis fallen wood,and take 15 and 66 years to decompose 50% and 95% of T.vernicifluum fallen wood.

关 键 词：秦岭 天然次生油松林 倒木 储量 分解 单项指数衰减模型 

分 类 号：S718.554[农业科学—林学]