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首页> 外文期刊>Ecological research >Woody Debris Stocks In Different Secondary And Primary Forests In The Subtropical Ailao Mountains, Southwest China
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Woody Debris Stocks In Different Secondary And Primary Forests In The Subtropical Ailao Mountains, Southwest China

机译：西南亚热带哀牢山次生林和原始林的木质碎片资源

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摘要

Woody debris (WD), including coarse woody debris (CWD) and fine woody debris (FWD), is an essential structural and functional component of many ecosystems, particularly in montane forests. CWD is considered to be the major part in forest WD and it is primarily composed of logs, snags, stumps and large branches, while FWD mainly consists of small twigs. Attributes of dead woody material may change in accordance with trends in stand dynamics. The primary forest (primary montane moist evergreen broad-leaved forest) in Ailao Mountain National Nature Reserve (NNR) preserves the largest tract of natural vegetation in China. The Alnus nepalensis (D. Don) association, Populus bonatii (Levl.) association and secondary Lithocarpus association represent the secondary and chronological types following human disturbance by fires and logging under different intensity. The mass and composition of coarse woody debris (CWD, ≥10 cm in diameter) and fine woody debris (FWD, 2.5-10 cm in diameter) were inventoried in a primary forest and its three secondary counterparts. Estimates of total mass of woody debris across secondary types to primary forest ranged from 2.4 to 74.9 Mg ha~(-1). The lowest value was found in the A. nepalensis association and the highest values were in the primary forest of which logs are the considerable differences. The ratios of CWD to FWD were low in the secondary types (about 1-4) but high in the primary forest (above 15). Our results suggested that for the recovery of woody debris in the secondary forest, it might last longer than the age of the oldest succes-sional stage studied.
机译：木屑（WD），包括粗木屑（CWD）和细木屑（FWD），是许多生态系统（尤其是山地森林）中必不可少的结构和功能组件。 CWD被认为是森林WD的主要部分，它主要由原木，断枝，树桩和大树枝组成，而FWD主要由小树枝组成。死木材料的属性可能会根据林分动态的变化而变化。哀牢山国家自然保护区（NNR）的原始森林（原始山地湿性常绿阔叶林）保存着中国最大的自然植被。 Alnus nepalensis（D. Don）协会，Populus bonatii（Levl。）协会和次生Licarpcarpus协会代表继人为和按时间顺序类型，这些人次是由于火灾和伐木在不同强度下对人类的干扰。在一个原始森林及其三个次生对应林中清查了粗木屑（CWD，直径≥10 cm）和细木屑（FWD，直径2.5-10 cm）的质量和组成。从次生类型到原始森林的木屑总质量估计范围为2.4至74.9 Mg ha〜（-1）。最低值出现在A. nepalensis关联中，最高值出现在原始林中，原木之间的差异很大。在次生类型中，CWD与FWD的比率较低（约1-4），而在原始森林中则较高（15以上）。我们的结果表明，要在次生森林中恢复木屑，其持续时间可能会比所研究的最老的成功阶段的年龄更长。

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