肉桂人工林间伐试验研究

对肉桂人工林间伐试验研究表明,5年生时实施间伐能明显改善林内的光环境,利于林木的光合作用,促进林木的生长和有机物质的积累。间伐强度20%~50%的各林分总生物量(包括因间伐移除的生物量)均明显高于不间伐的对照林分,经济效益明显提高,其中以间伐强度30%~50%,保留密度为3500~4500株/hm2的林分经济效益最高,投入产出比高达1:7.5~7.7。综合各因素的分析,以轮伐期8~10年的兼收型林分为培育目标,5年生时可根据林木长势、初植密度以及林木分化情况实施间伐。

Experiment on thinning of Cinnomamum plantation

According to the experiment on thinning of Cinnomamum plantation, the results showed that the thinning improved illuminance in the forest after thinning in the fifth year, promoted photosynthesis and accelerated growth of tree. When thinning intensity was 20 %~50 %, the total biomass of forest stand (include thinning) was higher than that of not thinning and economic benefit increased obviously. Economic benefit of thinning intensity of 30 %~50 %, and reserved density of 3 500~4 500 tree/hm was the highest, with input-output ratio of 1:7.5~7.7. Based on the analyzing factors, taking rotation 8~10 years both yield stand as cultural objective, the stand could be thinned according to the situation of growth, initial planting density and differentiation of trees in the fifth year.