Effects of 50 years of selective logging on demography of trees in a Malaysian lowland forest
Effects of 50 years of selective logging on demography of trees in a Malaysian lowland forest
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50 年的选择性采伐对马来西亚低地森林树木数量的影响
DOI：
10.1016/j.foreco.2013.08.057
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发表时间：
2013
影响因子：
3.7
通讯作者：
A. R.
中科院分区：
文献类型：
--
作者：
Yamada;T.;Hosaka;T.;Okuda;T.;Kassim;A. R.
物种特定的树木性能（生长，死亡率和招聘率）和人口增长率在1958年有选择地记录在一个记录的森林，在马来西亚的帕索森林保护区使用10年的森林人口数据（1998-2008年）在一个原始森林进行了比较。不同的森林结构和采伐森林有更明亮的林下光照条件比原始林。本研究的基本假设是，50年前选择性采伐造成的森林结构差异，通过增加森林光环境影响树木的性能和人口。所研究的物种表现出显着更快的胸径（直径在胸高）的增长率在采伐林比在原始林。有非常小的差异之间的死亡率采伐和原始森林。在采伐林的招聘率显着低于那些在原始林。因此，人口增长率显着较高的原始森林。这些发现支持了我们的假设，并意味着大约50年前的选择性采伐仍然影响着树木的性能和森林的人口。在被砍伐的森林中，早期演替物种的种群下降幅度大于其他物种，但在原始森林中情况并非如此。虽然仍然有一种可能性，即下降是由于干旱事件，因此只是暂时的，这表明砍伐森林的物种组成仍在变化，并获得额外的后期演替物种。因此，择伐后的森林仍处于次生演替阶段。我们应该注意到，短于50年的采伐周期可能不足以恢复采伐前的原始物种组成。
Species specific tree performance (growth, mortality, and recruitment rates) and population growth rate in a logged forest that was selectively logged in 1958 were compared with those in a primary forest using 10-year forest demographic data (1998–2008) in the Pasoh Forest Reserve in Malaysia. The forests differed in forest structure and the logged forest had brighter understory light conditions than the primary forest. The underlying hypothesis of this study is that the forest structural differences caused by selective logging 50 years ago affects tree performance and demography through increasing forest light environments. Species studied showed significantly faster dbh (diameter-at-breast-height) growth rate in the logged forest than in the primary forest. There was very little difference in mortality rates between the logged and primary forests. Recruitment rates in the logged forest were significantly lower than those in the primary forest. Consequently, population growth rates were significantly higher in the primary forest. These findings support our hypothesis and imply that selective logging approximately 50 years ago was still influencing tree performance and demography of the forest. In the logged forest, populations of early successional species declined more than the other species, although this was not the case in the primary forest. Although there still remains a possibility that the decline was due to a drought event and thus was just temporal, this suggests the species composition of the logged forest is still changing and gaining additional late successional species. Therefore, the logged forest was still in secondary succession after selective logging. We should note that logging cycles shorter than 50 years may not be enough long to recover original species composition before logging.
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