日本落叶松人工林抚育间伐起始期的研究

日本落叶松人工林抚育间伐开始期的选定，将直接影响其后期生长，通过对试验地调查并选取标准木进行树干解析，用两种不同的方法，从不同的角度对日本落叶松进行了抚育间伐开始期的确定，分析不同起始期对林分生长的影响，结果表明：间伐合理起始期可以通过分析林木胸径连年生长量情况来确定；初植密度高，间伐合理起始期提前，反之，推迟；超过合理间伐起始期会抑制林木生长。

Study on the Start Time of Tending and Intermediate Cuting of Larix Kaempferi Plantation

To choose the beginning time of tending and intermediate cutting in Larix kaempferi plantation will have a direct effect on its late growth. Based on the surveys of Larix kaempferi plantation in study plot,by selecting mean sample-trees and doing the stem analysis, the beginning time of tending and intermediate cutting by two different methods from different angles was determined. The start time of rational intermediate cut of the stands and the effects of different start time on the stands growth were analyzed. The results showed that the start time was decided by analysis of the growth of diameter at breast height in successive years; if the original planting density is high, the start time of rational intermediate cut will be advanced, or vice versa,if the start time is postponed, the stands growth will be inhibited.