Evaluation on Structure and Stability of Quercus mongolica Forest Community in Xiaolong Mountains

doi:10.13466/j.cnki.lyzygl.2022.04.006

Abstract

Abstract:

Quercus mongolica forest is the most typical secondary mixed forests in north of Xiaolong Mountains.Modern ecological approaches to forest structured management theory were applied to our study where four sample plots of 900m² were selected.Based on structural parameters including mixing(M),uniform angle index (W),neighborhood comparison(U),crowding (C)and diameter distribution,the community structure was analysed,and then the community stability was evaluated by π value method for stand optimal state,all of which aimed to understand this succession and structural characteristics of community,and further to provide scientific basis for natural forest cultivation and conservation.The results showed that the diameter class structure proved not to be a sheer inverted J shape,in which medium and small diameter of trees covering 6cm≤DBH≤12cm maintained stability of diameter class structure.The mingling of community was well,with mingling in highest intensity level accounting for 58.42% and that in higher intensity level accounting for 36.19%.65.46% of trees were in randomly distributed level,but they had not reached threshold value yet.Trees in weaker level for neighborhood comparison accounted for 25.13%,of which tree crown overlaped heavily and 45.17% of trees were in dense level for crowding.The community wasn't in optimal state because of maximum value in 0.66,thus the community was in stage of progressive succession.To maintain the development and stability of forest community,it needs to regulate the spatial structure,improve forest quality,and alleviate competition,so as to promote natural regeneration and recovery of mixed forest community.

Key words: Xiaolong Mountains, community, trees, distribution, structure, stability

CLC Number:

S757.2

JIANG Mengduo, MA Yingdong, JIANG Rui, DAI Xiaofen, LIU Jiancong, ZHAO Yaling. Evaluation on Structure and Stability of Quercus mongolica Forest Community in Xiaolong Mountains[J]. FOREST RESOURCES WANAGEMENT, 2022, (4): 36-44.

Figures/Tables 8

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样地	群落类型	林分密度/ (株/hm²)	平均树高/ m	平均胸径/ cm	平均冠幅/ m	蓄积量/ m³	胸高断面积/ m²
FS-1	蒙古栎-白桦混交林	1675	7.2	10.3	2.9	4.65	0.0083
FS-2	蒙古栎-白桦混交林	1300	7.7	10.9	2.9	3.83	0.0093
FS-3	蒙古栎-白桦混交林	1125	7.0	9.0	2.7	2.35	0.0064
FS-4	蒙古栎-白桦混交林	1413	7.4	10.9	2.9	4.12	0.0093

样地	空间结构			径级结构		林分组成		林分密度		林分长势		顶级种竞争		林木健康
样地	垂直结构	水平结构		直径分布		树种多样性		林分拥挤度		林分优势度		树种优势度		健康木比例/%
FS-1	1/0	0.521/0.5	J/0.5		0.85		0.85/0.5		0.67		0.17		60.45/0
FS-2	2/0.5	0.539/0.5	J/1		0.79		0.95/1		0.67		0.07		94.23/1
FS-3	1/0	0.578/0	J/0		0.83		1.1/1		0.64		0.15		65.56/0
FS-4	1/0	0.655/0	J/0		0.80		0.91/1		0.66		0.09		53.98/0