Numerical classification of associations and their stabilities of karst evergreen deciduous broad-leaved mixed forests in Mulun National Nature Reserve

doi:10.17520/biods.2019215

Abstract

Abstract:

Understanding plant composition, community structure and community distribution of karst climax communities can provide a reference for biodiversity conservation and forest management. Based on topographic factors, soil factors and species composition data of a 25 ha forest dynamic plot in Mulun, Guangxi, we numerically classified the association of karst evergreen deciduous broad-leaved mixed forests multivariate regression trees and a modified Godron stability analysis ( Godron, 1971; Zheng, 2000) method to measure the stabilities of associations. The results showed that the forest community was divided into six associations. They were as follows: (I) Ass. Cryptocarya microcarpa + Itoa orientalis + Lindera communis, (II) Ass. Cryptocarya microcarpa + Cleidion bracteosum + Brassaiopsis glomerulata, (III) Ass. Platycarya longipes + Rapanea neriifolia + Clausena dunniana, (IV) Ass. Platycarya longipes + Luculia intermedia + Clausena dunniana, (V) Ass. Cryptocarya microcarpa + Brassaiopsis glomerulata + Eurycorymbus cavaleriei, (VI) Ass. Boniodendron minus + Rubovietnamia aristate + Platycarya Longipes. Except for Ass. I, diversity indices of each association were higher. Shannon-Wiener index, Simpson index and Pielou evenness index showed similar trends: Ass. VI > Ass. V > Ass. IV > Ass. III > Ass. II > Ass. I. Species richness did not follow this trend and decreased in the following order: Ass. VI > Ass. IV > Ass. V > Ass. I > Ass. III > Ass. II. Species diversities of these associations were highest at middle altitudes. The stabilities of associations were highest at medium-high slope positions, while associations were lowest in depressions. Elevation is critical for community structure and composition and may be an important factor affecting community distribution.

Key words: vegetation classification, Godron stability analysis, multivariate regression trees, karst ecosystem, Mulun National Nature Reserve

Huijun Chen, Hu Du, Tongqing Song, Wanxia Peng, Hao Zhang, Liang Su, Fuping Zeng. Numerical classification of associations and their stabilities of karst evergreen deciduous broad-leaved mixed forests in Mulun National Nature Reserve[J]. Biodiv Sci, 2019, 27(10): 1056-1068.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2019215

https://www.biodiversity-science.net/EN/Y2019/V27/I10/1056

Figures/Tables 7

Fig. 1 Resubstitution and cross-validation relative error for the multivariate regression tree of 25 ha forest dynamic plot in Mulun. ▲, The change trend of relative error; ●, The change trend of cross-validated relative error; ■, The minimum cross-validated relative error; |, One standard error; ★, The tree size suggested by 1 - SE.

Fig. 2 Multivariate regression tree for community classification of 25 ha forest dynamic plot in Mulun. n, the number of samples in each group. The small bar plot representing the importance value of the species (in the same order as is the response data matrix).

Fig. 3 Map of the six associations at the scale of 20 m × 20 m of 25 ha forest dynamic plot in Mulun. Left, Original. Right, Revised.

Table 1 Species richness and tree density in six associations of 25 ha forest dynamic plot in Mulun

参数 Parameter	大样地 Whole plot	群丛I Association I	群丛II Association II	群丛III Association III	群丛IV Association IV	群丛V Association V	群丛VI Association VI
面积 Area (ha)	25	9.88	2.44	1.64	2.68	4.28	4.08
丰富度 Richness (ind.)	227	154	130	145	187	174	194
平均胸径 Average DBH (cm)	4.78	4.87	5.54	3.9	3.78	4.83	4.18
最大胸径 Max. DBH (cm)	115.12	115.12	89	55.3	68	57	48.72
植株密度 Density (ind./ha)	5,479	4,912	3,246	9,109	8,693	4,367	5,782

Table 2 Percentage of trees in different DBH class to total number of trees in six associations of 25 ha forest dynamic plot in Mulun

径级 DBH class	大样地 Whole plot	群丛I Association I	群丛II Association II	群丛III Association III	群丛IV Association IV	群丛V Association V	群丛VI Association VI
1-5 cm	72.10	67.58	61.45	77.04	79.85	68.94	75.87
5-10 cm	19.02	21.43	25.75	16.25	14.61	20.73	16.99
10-20 cm	7.68	9.64	10.24	5.98	4.92	8.71	6.12
20-30 cm	1.02	1.16	2.10	0.64	0.54	1.33	0.88
30-40 cm	0.14	0.14	0.27	0.07	0.06	0.27	0.12
40-50 cm	0.03	0.05	0.13	0.01	0.02	0.03	0.01
≥ 50 cm	0.01	0.00	0.06	0.01	0.00	0.01	0.00

Fig. 4 Diversity indices of the six associations of 25 ha forest dynamic plot in Mulun

Fig. 5 Stability graphs for six associations of 25 ha forest dynamic plot in Mulun

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