摘要
以杨桦次生林为研究对象,采用30-40%强度间伐和20%的中度间伐,以未间伐的林分为对照,研究比较了间伐后1年、2年和5年内的林下植物多样性的变化。结论如下:对于木本植物,间伐显著提高了林下木本植物的盖度(P<0.05),其大小顺序为强度间伐>中度间伐>对照,在间伐后2年、5年差异均显著(P<0.05)。对于林下草本植物,间伐显著提高了林下草本植物的种数,尤其在间伐后2年,中度间伐和强度间伐林下的木本植物种数、盖度、Simpson和Shannon多样性指数均显著高于对照(P<0.05);但随着间伐时间的延续,中度间伐和强度间伐对草本植物的影响逐渐减弱,其中度间伐林下的植物种数、Simpson和Shannon多样性指数与对照之间未能发现显著差异(P>0.05)。
In this paper, the poplar and birch forest as research object, using30 -40% 20% moderate thinning and thinning, thinning to stand not to control, change one years, two years and five years of understory plant diversity compared after thinning. Conclusions are as follows： for woody plants, thinning significantly improves the woody plants under forest coverage （ P 〈 0. 05 ）, its order of magnitude as the intensity thinning 〉 moderate thinning 〉 contrast, control significant- ly moderate thinning after 2 years or 5 years. For herbaceous understory, thinning significantly increased understory herb species, especially in the 2 years after thinning, thinning and thinning under moderate intensity of woody plant species, coverage, Simpson and Shannon diversity indices were significantly higher than that of the control （ P 〈 0. 05） ; but along with thinning time, moderate the effects of thinning and thinning on herbaceous plants decreased gradually, which not be- tween the degree of thinning of plant species, Simpson and Shannon diversity index were found significant differences （ P 〉 O. 05）.
出处
《林业勘查设计》
2014年第1期28-31,共4页
Forest Investigation Design
关键词
间伐强度
杨桦次生林
植物多样性
Thinning intensity
Poplar - Birch secondary forest
plant diversity
