Relationships between tree-community composition and regeneration potential of Shorea trees in logged-over tropical rain forests
Relationships between tree-community composition and regeneration potential of Shorea trees in logged-over tropical rain forests
复制标题
被砍伐的热带雨林中树木群落组成与望月树再生潜力之间的关系
DOI：
10.1080/13416979.2021.2015830
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发表时间：
2021
影响因子：
1.5
通讯作者：
Kanehiro Kitayama
中科院分区：
文献类型：
--
作者：
Yoshimi Sawada;Nobuo Imai;Ryuichi Takeshgie;Kanehiro Kitayama
砍伐森林在东南亚广泛分布，这些森林的树木群落组成差异很大，从接近原始的森林到由于重复的高影响伐木而大大改变的森林。在森林管理和养护方面，经改造的森林能否恢复到原来的状态是一个关键问题。然而，由于缺乏下一代幼苗，经过大幅改造的森林可能会失去复原力。我们研究了更新潜力ofShorea，在原始森林中的优势属，在各种森林，从原始到退化的森林，并调查了在婆罗洲北部的树冠层的树木群落组成和再生潜力之间的关系。在基于属级树木群落组成的非度量多维尺度分析（nMDS）中，将31个样地沿沿着1轴从原始林到退化林排序，并将其作为森林完整性的度量。除部分退化林外，大部分样地的乔木层均呈倒J型分布。原始林径级分布偏度较高，退化林径级分布偏度显著降低。偏度反映了滨藜种群中幼苗的丰富程度，是衡量滨藜种群更新潜力的重要指标。幼苗的数量也急剧下降，森林完整性沿着nMDS轴-1。这两个指标的减少表明，再生潜力突然失去时，森林的完整性方面的树木群落组成正在减少。
Logged-over forests are widespread in SE Asia, and these forests vary greatly in tree-community composition ranging from a near pristine to a greatly modified forest due to repeated high-impact logging. It is a critical concern in terms of forest management and conservation whether modified forests can recover to their original states. However, greatly modified forests may lose the resilience due to the lack of next-generation seedlings. We examined the regeneration potential ofShorea, a dominant genus in pristine forests, in various forests ranging from pristine to degraded forests, and investigated the relationship between the tree-community composition in canopy layer and the regeneration potential in north Borneo. In non-metric multidimensional scaling (nMDS) analysis based on the tree-community composition at genus level, 31 study plots were sorted in the order from pristine to degraded forests along the axis-1 with decreasing the axis-1 scores, and this score was used as a metric of forest intactness. Size distribution ofShoreatrees combining all congeneric species showed an inverse-J shape in most plots excluding some degraded forests. The skewness of size distribution was high in pristine forests but remarkably decreased in degraded forests. The skewness reflected the abundance of seedlings in the population ofShoreatrees, and it was an important metric indicating regeneration potential. The number of seedlings also decreased abruptly with decreasing forest intactness along the nMDS axis-1. The reduction in these two metrics suggests that regeneration potential is abruptly lost when the forest intactness in terms of tree-community composition is decreasing.