摘要:
研究了杉木乳源木莲混交林的间伐效应,结果表明:11年生杉木乳源木莲8:2混交林,林分密度3600株·hm-2,经间伐后现存密度2432株·hm-2,杉木乳源木莲混交比例3:1,间伐后有利于珍贵树种乳源木莲的生长,也有利于保留杉木的生长。间伐后6 a间伐林与CK相比,乳源木莲平均胸径、平均树高分别提高了47.2%和22.1%,杉木平均胸径、平均树高、立木材积分别提高了59.7%、32.3%、177%,间伐与未间伐对比,两者间平均胸径达到显著水平,立木材积生长量达到极显著水平。乳源木莲平均单株净生产量7.02kg·a-1,杉木平均单株净生产量仅2.13 kg·a-1。间伐不但提高了林分生产力,而且提高了珍贵阔叶树的生长量,改善了林分结构,能够更好发挥森林的生态功能和社会效益。
关键词:
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乳源木莲
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杉木
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混交林
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间伐效应
Abstract:
The effect of thinning on mixed forest of Chinese fir and Manglietia yuyuanensis was studied in this paper.The result showed that thinning was beneficial to the growth of rare tree species-Manglietia yuyuanensis and remained Chinese fir.Compared to those of control,the average DBH and tree height of Manglietia yuyuanensis were improved by 47.2% and 22.1% respectively,the average DBH,tree height and standing volume of Chinese fir were significantly improved by 59.7%,32.3% and 177% respectively after six years of thinning.The average individual net output of Manglietia yuyuanensis and Chinese fir were 7.02 kg·a-1 and 2.13 kg·a-1 respectively.Thus,the stand productivity was enhanced,the output of rare was broad-leaved tree was protected and enhanced,and the stand structure was improved by thing,and then the foresty brought ecological function and social benefit into play mueh more.
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