Extending the rotation period in larch plantations increases canopy heterogeneity and promotes species richness and abundance of native beetles: Implications for the conservation of biodiversity
Extending the rotation period in larch plantations increases canopy heterogeneity and promotes species richness and abundance of native beetles: Implications for the conservation of biodiversity
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DOI：
10.1016/j.biocon.2011.10.008
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发表时间：
2011-12
影响因子：
5.9
通讯作者：
M. Ohsawa;Toshio Shimokawa
中科院分区：
文献类型：
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作者：
M. Ohsawa;Toshio Shimokawa
研究了延长轮伐期（长轮伐期）及相关生态因子对日本落叶松人工林6个甲虫科生物多样性的影响。比较了中龄和长轮伐期人工林林下和冠层甲虫多样性。确定了各甲虫科物种丰富度与24个生态变量之间的关系。我们发现，甲虫多样性往往增加与长期轮伐，并在两个林地层（林下和冠层）不同的生态变量的反应;例如，冠层中的植食性增加。在所测的24个生态变量中，自然更新的成熟树木的物种丰富度，它们的丰富度和粗木质材料（CWM）的质量和数量对甲虫多样性的影响最大。前两个变量随着轮伐期的延长而增加，但与水煤浆相关的大多数变量并没有增加，因为间伐的树木在中龄人工林中作为倒下的原木被留下。因此，发生自然再生的本地树木，已经长得足够高，达到冠层高度在长轮伐期人工林落叶松人工林的生物多样性的改善，有助于本地甲虫物种丰富度在这些林地。长时间的轮伐使人工林更加异质，特别是在树冠层，并促进更大的本地甲虫多样性。
We studied the effects of extending the rotation period (long-rotation) and related ecological variables on the biodiversity of six beetle families in larch (Larix kaempferi) plantations. Beetle diversity in the forest understory and the canopy of long-rotation and middle-aged plantations was compared. The relationships between the species richness of each beetle family and 24 ecological variables were identified. We found that beetle diversity tended to increase with long-rotation and responded differently to the ecological variables in two woodland strata (understory and canopy); e.g., an increase in phytophagies occurred in the canopy. Among the 24 measured ecological variables, the species richness of naturally regenerated mature trees, their abundance, and the quality and quantity of coarse woody material (CWM) had the strongest influences on beetle diversity. The former two variables increased with long-rotation; however, most variables related to CWM did not increase because thinned trees were left in middle-aged plantations as fallen logs. Therefore, the occurrence of naturally regenerated native trees that had grown sufficiently tall to reach canopy height in long-rotation plantations underpinned the improved biodiversity in larch plantations, contributing to native beetle species richness in these woodlands. Long-rotation makes plantations more heterogeneous, particularly in the canopy, and promotes greater native beetle diversity.