Effects of Forest Gaps on the Regeneration Pattern of the Undergrowth of Secondary Poplar-Birch Forests in Southern Greater Xing'an Mountains

doi:10.13466/j.cnki.lyzygl.2019.04.005

Abstract

Abstract:

The effects of different forest gap sizes on the regeneration pattern of the undergrowth of secondary Poplar-birch were studied,which provided theoretical basis and reference for the artificial near-natural simulation of forest gap disturbance renewal.Taking the secondary Poplar-birch forest in the Southern Greater Xing'an Mountains,Inner Mongolia as the research object,the 6hm2 large plots were divided into the upper part,the middle and the lower part of slopes according to the altitude gradient.Each slope was divided into 4 forest gap area grades,and each grade was selected 3 forest gaps of different sizes,as three repetitions,36 forest gaps are selected for each slope position,and 5regeneration seedling survey samples are set in each forest gap.At the same time,36 control samples (CK) of the same area were set.A total of 180 regeneration seedlings samples and 180 CK samples were set up and surveyed in the forest gaps.The results showed that the forest gap had the tendency to decrease the regeneration density of the original pioneer species (Mongolian scorpion); the sorghum in the forest gap was the main renewed species.From the lower part,to the middle part and the upper part of slopes,the regeneration seedling density of Quercus mongolica accounted for 61.9%,50% and 39.86% of the total renewal density respectively.The regenerated seedlings in the forest gaps are mainly low-lying plants (<60 cm),and the number of regenerated seedlings show a decrease with an increase of height level in different slope positions and different forest gap areas.The number of regenerated seedlings in different heights of different slopes showed that there were more large forest gaps than small ones.The slope position and forest gap area all had significant effects on the algae diameter of Quercus mongolica (p<0.05),forest gaps could significantly promote the regeneration of Quercus mongolica.The growth of seedlings was the largest in the forest gap area of 80-100 m ².The diameter of the seedlings in the forest gapin the lower part and the upper part of slopes were higher than those in the forest,and there was no such performance in the middle part of slopes.In general,forest gaps can significantly promote the regeneration and growth of undergrowth species,and have a tendency to reduce the density of regeneration of the original pioneer speciesMongolian mongolica.

Key words: Southern greater Xing'an mountains, secondary poplar-birch forest, gaps, Mongolian, regeneration pattern

CLC Number:

S754

LIU Bingbing, ZHAO Pengwu, ZHOU Mei, WANG Yuan, YANG Liu, SHU Yang. Effects of Forest Gaps on the Regeneration Pattern of the Undergrowth of Secondary Poplar-Birch Forests in Southern Greater Xing'an Mountains[J]. FOREST RESOURCES WANAGEMENT, 2019, (4): 31-36.

Figures/Tables 5

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References 17

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坡位	海拔/ m	面积等级/ m²	林窗面积/ m²	坡向	形成方式
坡下	1182~1220	≤50	38.2~ 49.5	WN	JZ
		50~80	55.3~ 78.5	WN	ZZ
		80~100	80.0~ 97.2	WN	JZ
		≥100	102.5~277.8	WN	ZZ
坡中	1230~1261	≤50	28.5~ 48.2	WN	ZZ
		50~80	50.3~ 77.5	WN	ZZ
		80~100	88.0~ 99.7	WN	ZZ
		≥100	125.5~242.2	WN	ZZ
坡上	1264~1311	≤50	21.3~ 47.5	WN	ZZ
		50~80	51.8~ 72.1	WN	ZZ
		80~100	90.2~ 99.5	WN	JZ
		≥100	123.5~243.1	WN	JZ

坡位	树种		面积等级/m²
坡位	树种		≤50		50~80		80~100		≥100	CK
坡下	蒙古栎	9333.333		9291.667		5000		13333.33		10556
	山杨	2500		0		2500		0		556
	白桦	2500		0		0		6250		0
	鼠李	4687.5		0		0		0		0
	黑桦	2500		0		0		0		0
	山丁子	2500		0		0		0		0
坡中	蒙古栎	5000		6250		5000		3888.889		2500
	山杨	5000		6250		2500		5138.889		1500
	白桦	0		0		2500		0		1000
坡上	蒙古栎	7083.333		5277.778		4583.333		6805.556		7000
	山杨	3750		3750		0		8750		1000
	白桦	0		0		0		5000		0
	蒙段	0		4583.333		5000		5000		0

源	Ⅲ 类平方和	自由度	均方	F	显著性	偏 Eta 平方
坡位	43.209	2	21.605	3.931	0.020	0.208
林窗面积	61.278	4	15.319	2.787	0.024	0.271