Management of insect biodiversity by line thinning in Japanese cedar (Cryptomeria japonica D. Don) plantations, central Japan
Management of insect biodiversity by line thinning in Japanese cedar (Cryptomeria japonica D. Don) plantations, central Japan
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日本中部日本雪松 (Cryptomeria japonica D. Don) 种植园通过间伐管理昆虫生物多样性
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
S. Taniguchi
中科院分区：
文献类型：
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作者：
M. Maleque;H. Ishii;K. Maeto;S. Taniguchi
通过研究疏线对鞘翅目和膜翅目昆虫常见科生物量和多样性的影响，探讨疏线对日本中部杉木人工林昆虫多样性管理的重要性。在林木间伐中，3至5米宽的林分线形部分与斜坡平行，通常垂直于森林道路。在线条变细的部分之间，保留了5到12米宽的看台部分。本文比较了低海拔杉木立地（疏林4年）和高海拔Kuchiotani立地（疏林6年）两种人工林中线疏林分与相邻未疏林分间鞘翅目和膜翅目昆虫的丰度和多样性。两目生物量随林下植物生物量的增加而增加。在疏林林分的疏林和保留林分中，鞘翅目和膜翅目生物量比未疏林林分最高增加130%。在Kuchiotani地点，线疏林和未疏林之间的差异更大，可能是因为该地区有更多的天然林，作为各种昆虫群体的来源栖息地。节肢动物多样性可以作为生态系统完整性的一个指标，因此我们认为疏林是一种有效的造林处理方法，可以提高库存过剩的日本刺槐人工林的生物多样性。
We investigated the effects of line thinning on the biomass and diversity of common families of the two insect orders, Coleoptera and Hymenoptera, to evaluate the importance of line thinning for the management of insect biodiversity in Japanese cedar plantations in central Japan. In line thinning, 3- to 5-m-wide linear sections of the stand are harvested parallel to the slope and often perpendicular to the forest roads. Between the line-thinned sections, 5- to 12-m-wide stand sections are retained. We compared abundance and diversity of Coleoptera and Hymenoptera between line-thinned stand and an adjacent unthinned stand in two plantations: low-elevation Sugi site (four years since thinning) and high-elevation Kuchiotani site (six years since thinning). Biomass of both orders increased with increasing understory plant biomass across the two sites. Biomass of Coleoptera and Hymenoptera increased as high as 130% in the thinned and retained sections of the line-thinned sections of the line-thinned stand relative to the unthinned stand. The difference between the line-thinned stand and unthinned stands was greater for the Kuchiotani site, probably because this region supports more natural forests that serve as source habitats for various insect groups. Because arthropod diversity can be used as an indicator of ecosystem integrity, we conclude that line thinning is an effective silvicultural treatment for enhancing biodiversity of overstocked C. japonica plantations.