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为了探明水曲柳萌芽更新的最佳采伐季节和适宜保留郁闭度,在哈林场36年生的人工水曲柳林内,于1989年8月采伐10株,11月采伐476株;1990年8月、5月各采伐20株。从1990年4月中旬开始定期调查、记载各伐根的萌芽情况和优势萌条的生长量,比较其优劣。通过调查分析得出:1989年11月和1990年3月采伐的伐根萌芽率高,前者为80％,后者为90％;在直径和高生长量方面也是如此,如以1989年8月采伐的径和高各为100,则1989年11月和1990年3月采伐的便分别为162,172和161,173。通过综合分析认定:11月至3月为最佳更新采伐季节。林分保留郁闭度与伐根萌芽率,优势萌条径、高生长量呈反相关,故萌芽更新的林分保留郁闭度不能超过0.6,以0.5以下为宜。萌芽更新需及时抹去多余萌条,以保证优势萌条旺盛生长。同时,对保留的萌条基部要培土,以防倒伏和劈折。
In order to find out the best harvesting season and the optimal canopy density, we planted 10 plants in 36-year-old manchurian ash forest in Harlech field and cut them in August 1989 and 476 in November. Month, May harvest 20 each. From mid-April 1990 began a regular survey to record the sprouting of the root and the growth of the dominant sprout, comparison of their merits. According to the survey and analysis, the sprouting rate of cutting in November 1989 and March 1990 was high, with the former being 80% and the latter being 90%, as well as the diameter and high growth rate. As shown in August 1989 The harvesting trails and heights are each 100, with harvests of 162,172 and 161,173 respectively in November 1989 and March 1990. Through comprehensive analysis finds that: November to March for the best update logging season. Forest stand canopy retention and sprouting germination rate, the dominant sprout diameter, high growth was inversely correlated, so the sprouting of the regeneration of canopy retention canopy density can not exceed 0.6, preferably below 0.5. Sprout updates need to promptly erase unnecessary sprouts, in order to ensure the prosperous sprouts grow vigorously. At the same time, to retain the sprouted base to earth, to prevent lodging and splitting.