森林抚育对落叶松林生长的影响研究

Effects of Forest Tending on Larix gmelinii Pure Forest

通过对塞罕坝国家级自然保护区内落叶松林进行森林抚育,并对其生长变化进行测定,结果表明:林分进行森林抚育的3次生长率都是增加,但生长率增长的年数不同,第1次抚育时间最长,为5年;其次为第2次抚育,为4年;最后为第3次抚育,增长年数为3年。3次抚育生长率增长的最大值也是不同的,第1次抚育是最大的,为13.8%;其次为第2次抚育,为10.6%;最后为第3次抚育,生长率为9.7%。林分进行抚育后生长率变化规律是先增加后下降,呈正态曲线的变化趋势,说明其生长速度由于生长空间增大而加快。

Through the forest tending of Larix gmelinii pure forest in Saihanba National Nature Reserve,the growth changes were measured.Result shows that the three growth rates of forest tillage increase;the number of years is different,the first is the longest,being five years;followed by the second,four years;finally the third,the growth is three years;the maximum growth rate of the three tending growth rate is also different,the first tending is the largest,being 13.8%;followed by the second tending,which is 10.6%;finally the third tending,the growth rate is 9.7%;the growth rate of the stand after the tending increase firstly.After falling,it shows a trend of normal curve,indicating that its growth rate is accelerated by the increase of growth space.