Community characteristics and spatial distribution of dominant tree species in a secondary forest of Daqing Mountains, southwestern Guangxi, China

doi:10.17520/biods.2014145

Abstract

Abstract:

In order to determine species characteristics and the factors affecting distribution patterns of dominant tree species of secondary forests in Daqing Mountains, we analyzed community composition, DBH size structure, species distribution and spatial correlations using a point pattern analysis of O-ring statistical method. There were a total of 109 species including 58 tree species, 29 shrub species and 22 herb species in a 1 ha plot. The floristic composition was pan-tropical with Quercus griffithii and Eberhardtia aurata as the co-dominant species. These two species accounted for 30.8% of the total number of individuals. Neolitsea chuii, Beilschmiedia fordii and Camellia cuspidate were the secondary tree species of the community. The DBH size structure of the populations showed a reverse J-shaped pattern with a greater number of small diameter (1-5 cm) individuals. Species spatial distribution with environmental heterogeneity was aggregated but decreased significantly with increasing spatial scales. Spatial distribution and heterogeneity were independent at most spatial scales among the main species populations.

Key words: spatial distribution, spatial correlation, species composition, secondary forest, lower subtropical area

You Nong, Lu Zheng, Hongyan Jia, Lihua Lu, Dewei Huang, Bohua Huang, Liqun Lei. Community characteristics and spatial distribution of dominant tree species in a secondary forest of Daqing Mountains, southwestern Guangxi, China[J]. Biodiv Sci, 2015, 23(3): 321-331.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2014145

https://www.biodiversity-science.net/EN/Y2015/V23/I3/321

Figures/Tables 8

Table 1 Forest stratification and diversity in the 1-ha secondary forest plot of Daqing Mountains

层次 Stratification	物种丰富度指数 Species richness (S)	Shannon-Wiener指数 Shannon-Wiener index (H′)	Simpson指数 Simpson index (D)	均匀度指数 Evenness index (J_sw)
乔木层 Tree Layer	58	2.95	0.91	0.73
灌木层 Shrub Layer	29	2.25	0.82	0.70
草本层 Herb Layer	22	2.02	0.78	0.65

Fig. 1 DBH size structure of trees in the 1-ha secondary forest plot of Daqing Mountains I: 1.0-2.5 cm; II: 2.5-5.0 cm; III: 5.0-10.0 cm; IV: 10.0-15.0 cm; V: 15.0-20.0 cm; VI: 20.0-25.0 cm; VII: 25.0-30.0 cm; VIII: 30.0-40.0 cm; IX: 40.0-50.0 cm; X: ≥50.0 cm.

Fig. 2 DBH size structure of main tree species in the 1-ha secondary forest plot of Daqing Mountains I: 1.0-2.5 cm; II: 2.5-5.0 cm; III: 5.0-10.0 cm; IV: 10.0-15.0 cm; V: 15.0-20.0 cm; VI: 20.0-25.0 cm; VII: 25.0-30.0 cm.

Table 2 The importance value of main tree species in the 1-ha secondary forest plot of Daqing Mountains

种名 Species	个体数 Individuals	胸高断面积 Basal area (cm²)	重要值 Importance value (%)
大叶栎 Quercus griffithii	594	29,800.92	33.59
锈毛梭子果 Eberhardtia aurata	459	26,591.51	28.83
鹿角锥 Castanopsis lamontii	107	44,791.11	21.98
尖连蕊茶 Camellia cuspidata	318	10,046.76	17.69
木姜子 Litsea pungens	75	22,724.85	13.58
鸭公树 Neolitsea chuii	123	16,414.89	13.50
广东琼楠 Beilschmiedia fordii	121	13,834.18	13.34
罗浮锥 Castanopsis faberi	39	27,981.65	13.16
环鳞烟斗柯 Lithocarpus corneus	127	15,114.14	13.02
桂南木莲 Manglietia chingii	75	20,219.74	12.77
柠檬金花茶 Camellia limonia	142	6,196.79	11.00
海南山龙眼 Helicia hainanensis	129	5,881.87	10.28

Fig. 3 The distribution of main species in the 1-ha secondary forest plot of Daqing Mountains. (a) Quercus griffithii; (b) Castanopsis lamontii; (c) Litsea pungens; (d) Neolitsea chuii; (e) Eberhardtia aurata; (f) Camellia cuspidata; (g) Castanopsis faberi; (h) Beilschmiedia fordii.

Table 3 Effects of habitat heterogeneity on the spatial distribution pattern of main tree species

种名 Species	尺度 Scale (m)
种名 Species	0-10	11-20	21-30	31-40	41-50
大叶栎 Quercus griffithii	a	a	a	a	a
广东琼楠 Beilschmiedia fordii	a	a	a	a	a
尖连蕊茶 Camellia cuspidata	a	a	a	a	a
鹿角锥 Castanopsis lamontii	a	a	a	a	a
罗浮锥 Castanopsis faberi	a	a	a	a	a
木姜子 Litsea pungens	a (+)	a (0)	a	a	a (+)
锈毛梭子果 Eberhardtia aurata	a	a	a	a	a
鸭公树 Neolitsea chuii	a	a	a	a	a

Fig. 4 Spatial distribution pattern of the main populations without environmental heterogeneity effect. The solid line is the analysis of the data of O(r), the dotted line is the envelope curve, representing the 99% confidence intervals of the simulation. (a) Quercus griffithii; (b) Beilschmiedia fordii; (c) Camellia cuspidata; (d) Castanopsis lamontii; (e) Castanopsis faberi; (f) Litsea pungens; (g) Eberhardtia aurata; (h) Neolitsea chuii.

Fig. 5 Interspecific analysis of main populations in the secondary forest of Daqing Mountains. The solid line is the analysis of the data of O12(r), the dotted line is the envelope curve, representing the 99% confidence interval of the simulation. (a) Quercus griffithii-Camellia cuspidata; (b) Quercus griffithii-Castanopsis lamontii; (c) Quercus griffithii-Eberhardtia aurata; (d) Castanopsis lamontii-Camellia cuspidata; (e) Castanopsis lamontii-Eberhardtia aurata; (f) Eberhardtia aurata-Camellia cuspidata.

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