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林业科学 ›› 2012, Vol. 48 ›› Issue (6): 141-146.doi: 10.11707/j.1001-7488.20120621

• 研究简报 • 上一篇    下一篇

秦岭火地塘天然次生油松林倒木储量与分解

袁杰1, 蔡靖1,2, 侯琳1,2, 张硕新1,2   

  1. 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
  • 收稿日期:2011-06-22 修回日期:2011-09-04 出版日期:2012-06-25 发布日期:2012-06-25
  • 通讯作者: 张硕新

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

Yuan Jie1, Cai Jing1,2, Hou Lin1,2, Zhang Shuoxin1,2   

  1. 1. College of Forestry, Northwest A & F University Yangling 712100;2. Qinling National Forest Ecosystem Research Station Ningshan 711600
  • Received:2011-06-22 Revised:2011-09-04 Online:2012-06-25 Published:2012-06-25

摘要:

粗头直径≥10 cm,长度通常≥1 m,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。

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

Abstract:

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 (R</em>2=0.98178), while that of T. vernicifluum fallen wood was 0.045 33 (R</em>2=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.

Key words: Qinling Mountains, natural secondary Pinus tabulaeformis forest, fallen wood, storage, decomposition, monomial exponential attenuation model

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