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前言落叶松具有前期生长快、采伐期短的经营特性,作为造林树种,能在柳杉、扁柏等难以造林的地方栽植。在日本,尤其在北海道、东北地区寒冷的山地作为造林树种,已被广泛应用,其人工林面积已超过100万公顷。可是从这些人工林的令级结构来看,现在5令级以下,需要抚育的林分,约占总面积的80%以上。以前,利用落叶松对立地条件适应性强的有利特性,主要以生产小径材为经营目标,通过短伐期以及高密度经营,把重点放
Preface Larch has the characteristics of fast growth in the early stage and short harvesting period. As an afforestation tree species, larch can be planted in places difficult for afforestation such as cedar, cypress. In Japan, especially in Hokkaido, the cold mountainous northeast of Japan has been widely used as an afforestation tree species, and its planted forest area has exceeded 1 million hectares. However, according to the order structure of these plantations, the number of stand below 5 orders and requiring tending is about 80% of the total area. In the past, taking advantage of the favorable adaptability of the larch to the opposite conditions, the Company mainly focused on the production of small-diameter timber. Through short-cutting and high-density operation,