人工兴安落叶松用材林主伐年龄的研究

兴安落叶松是黑龙江省的主要造林树种,其人工林的林龄已达20～30年,一些地区林龄可达35年以上。为合理确定人工兴安落叶松林的主代年龄,对人工兴安落叶松的生长进行了调查研究,结果如下:1.人工兴安落叶松林的数量成熟龄为31～40年。2.人工兴安落叶松林小径材的工艺成熟龄为25年。3.根据人工兴安落叶松林生长的立地,进行定向培育。对Ⅲ以上地位指数林分,培育中径材,主伐年龄为31～40年;对Ⅳ以下地位指数林分,培育松木杆材,主伐年龄为25年。4.为合理经营人工兴安落叶松林,制止乱砍滥伐,应将人工林的木材生产纳入国家计划,实行伐区拔交、验收管理。

A Study on the Felling Age of Artificial Larix gmelinii Rupr. Wood Trees

Larix gmelinii is the fundamental afforestation species in Hei-longjiang province. The age of artificial Larix gmelinii trees in various districts is 20-30 years at present. Some districts have grown the trees for more than 35 years, and various districts began have to fell and exploit them. Because the proper felling age is not everywhere the same, management is now quite confused. To reasonably determine the felling age of artificial Larix gmelinii trees, we investigated their growth, and got the following conclusions.1. the quantitative mature age of artificial Larix gmelinii trees is 31-40 years. 2. the technical mature age of artifi-cial Larix gmelinii trees is 25 years. 3. the trees which grow on the site indexes above 3 may breed middle diameter timber, the felling age of which 31-40s the trees which grow on the site index below 4 may breed pine pole stock, the felling age of which is 25 years.