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本文依据人工落叶松林13年的间伐试验结果,探讨了间伐对林分直径、森林收获量、产值、成熟龄和立地环境的影响。一、试验概况 (一)试验地试验地位于吉林省寒葱岭林场东山。该地区年均温为2.6℃,年均降水量为621mm,平均无霜期为110—115天。土壤为山地暗棕壤。 1958年春在撩荒地上栽植2年生落叶松苗,初植密度为6660株/ha。1965年进行过一次生产性间伐。1971年冬设置10块间伐效益试验区。其面积除6、7号区为0.05ha外,其余均为0.10ha。试验区概况见表1。
Based on the results of thinning experiments of artificial larch forests for 13 years, this paper discussed the effects of thinning on stand diameter, forest harvest, output value, mature age and site environment. First, the test profile (A) The experimental site of the experiment is located in Jilin Province Han Cong Ling Forestry Center Dongshan. The annual average temperature is 2.6 ℃, the average annual rainfall is 621mm, the average frost-free period is 110-115 days. The soil is dark brown soil. In the spring of 1958, two-year-old larch seedlings were planted on the uplifted land. The initial planting density was 6660 plants / ha. A productive thinning took place in 1965. 1971 winter set 10 thinning benefit trial area. In addition to area 6,7 area 0.05ha, the rest are 0.10ha. Test area profile in Table 1.