Research on Undergrowth Plant Diversity in Larix Principis-rupprechtii Plantation with Different Thinning Levels —Taking Longxing Forest Farm of Guandishan in Shanxi Province as an Example

doi:10.13466/j.cnki.lyzygl.2017.01.010

Abstract

Abstract:

Thinning is one of the important technical measures of forest management and also an important way to improve and maintain forest diversity and sustainability.Therefore,thinning and fixed-point observation which can clarify the impacts the thinning operations have on undergrowth diversity,the difference which different thinning intensities make in undergrowth diversity and the effects the different thinning intensities have on the duration and dynamic change of plant diversity,which can also reveal the impacts the management activities have on the formation of forest diversity and the role in maintaining mechanism and have important theoretical and practical significance.In this paper,through a series of different thinning intensity tests and a 6a fixed observation in Larix principis-rupprechtii plantation in Longxing Forest Farm,using plant species composition,species diversity index and community similarity index of Sorensen to analyze and reveal the difference which different thinning intensities made on the Larix principis-rupprechtii plantation undergrowth species composition and its influence on the plant species diversity and its dynamic change.Results suggest that thinning can significantly increase the undergrowth plant diversity.The plant species increased as the thinning was enhanced.In addition,thinning can also increase species diversity of undergrowth plants significantly.There are significant differences between the thinned and the unthinned.The difference of species diversity under different thinning intensities is also obvious.Medium and heavy thinning had more significant influence.After thinning for 6a,plant species of undergrowth plants and diversity index continued to increase and the thinning effect was still significant.Compared to the control stands,the mutual plant and similarity coefficient of undergrowth plants were significantly lower.The mutual plant and similarity coefficient would be lower if there was greater difference in thinning intensity.

Key words: Larix Principis-rupprechtii plantation, thinning effect, undergrowth plants, plant diversity, duration of effect

CLC Number:

S718.5
X176

LIU Hongyan, CHENG Dongli, LIU Jie, ZHAO Yu, ZHANG Yunxiang, GUO Jinping. Research on Undergrowth Plant Diversity in Larix Principis-rupprechtii Plantation with Different Thinning Levels —Taking Longxing Forest Farm of Guandishan in Shanxi Province as an Example[J]. FOREST RESOURCES WANAGEMENT, 2017, (1): 50-56.

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地点	海拔/m	坡向	坡位	郁闭度	保留密度/(株/hm²)	间伐强度/%	间伐强度类型
	1760	半阴坡	中	0.93	5500	0
南介沟	1740	半阴坡	中	0.92	5200	0	对照(CK)
	1720	阴坡	中	0.90	5000	0
	1710	半阴坡	中	0.85	4500	12.3
丁羊沟	1730	阴坡	中	0.80	4350	20.4	弱度(L)
	1690	半阴坡	中	0.78	4000	23.5
	1760	阴坡	中上	0.70	3800	27.5
五叶沟	1740	半阴坡	中	0.68	3720	30.3	中度(M)
	1750	半阴坡	中	0.65	3500	34.4
	1720	阴坡	中	0.63	2800	40.6
李山沟	1740	半阴坡	中	0.62	2700	41.3	重度(H)
	1710	半阴坡	中	0.60	2500	43.6

时间	相似系数			共有种数
时间	M/H	M/L	H/L	M/H	M/L	H/L
间伐后1年	89.66	89.64	79.52	39	35	33
间伐后3年	89.58	87.36	76.40	43	38	34
间伐后6年	97.09	86.60	86.00	50	42	43

时间	相似系数			共有种数
时间	L	M	H	L	M	H
间伐后1年	75.06	76.71	69.23	26	28	27
间伐后3年	77.78	68.35	56.79	28	27	23
间伐后6年	71.79	56.79	59.52	28	23	25