Responses of spatial pattern of woody plants’ basal area to topographic factors in a tropical karst seasonal rainforest in Nonggang, Guangxi, southern China

doi:10.17520/biods.2015207

Abstract

Abstract:

Spatial patterns of aboveground biomass are important aspect of species distribution patterns, whereas the environmental heterogeneity caused by the topographical differences in the scope of local scales is the environmental basis for the formation and evolution of this pattern in natural forest systems. In this study, we examined the spatial patterns of total basal area of woody plants, to quantitatively analyze the response mechanisms of the spatial patterns of total basal area to the seven topographic factors using a generalized additive model in a fully mapped 15 ha permanent plot in a northern tropical seasonal rainforest in a karst landscape in southern China. We used the total basal area of all the individuals and each DBH class in each 20 m × 20 m quadrat as a standard to measure the value of aboveground biomass of woody plants. Results showed that the hillside had the highest total basal area but the lowest was found at the ridge of the three habitat types. The total basal area of the ridge was significantly different between the hillside and the depression. Topographic factors had definite effects on the total basal area of woody plants, with the following sequence: elevation > aspect > convexity > rock-bareness rate (RBR) > altitude above channel (ACH) > slope > topographic wetness index (TWI). All topographical factors were statistically significant with the exception of the TWI and slope showing marginally significant. The relationships between the spatial variation of total basal area of woody plants and topographic factors reflected the response mechanisms and growth strategies of woody plants in a tropical seasonal rainforest under the effects of the redistribution of soil, water and light conditions.

http://jtp.cnki.net/bilingual/detail/html/SWDY201601005

Key words: pattern, basal area, topographic factors, contribution rate, Nonggang Dynamics Forest Plot, tropical karst seasonal rainforest

Yili Guo, Bin Wang, Wusheng Xiang, Tao Ding, Shuhua Lu, Fuzhao Huang, Shujun Wen, Dongxing Li, Yunlin He, Xiankun Li. Responses of spatial pattern of woody plants’ basal area to topographic factors in a tropical karst seasonal rainforest in Nonggang, Guangxi, southern China[J]. Biodiv Sci, 2016, 24(1): 30-39.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2015207

https://www.biodiversity-science.net/EN/Y2016/V24/I1/30

Figures/Tables 4

References 44

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径级 DBH Class (cm)	环境参数 Environmental parameters	r²_adj	累计解释偏差 Cumulative explained deviation (%)	赤池信息准则Akaike Information Criterion (AIC)
所有个体 All individuals	海拔 Elevation	0.148	16.1	-88.071
	坡向 Aspect	0.256	28.4	-130.984
	凹凸度 Convexity	0.291	33.1	-142.770
	岩石裸露率 Rock-bareness rate	0.313	36.0	-148.860
	地形湿润指数Topographic wetness index	0.314	36.4	-149.909
	坡度 Slope	0.322	37.4	-152.044
	干旱度指数 Altitude above channel	0.336	39.4	-156.461
DBH < 2.5	海拔 Elevation	0.113	12.6	-2,416.026
	坡向 Aspect	0.153	18.4	-2,425.371
	凹凸度 Convexity	0.193	22.8	-2,441.038
	岩石裸露率 Rock-bareness rate	0.266	29.7	-2,477.055
	地形湿润指数Topographic wetness index	0.303	34.0	-2,492.105
	坡度 Slope	0.311	34.9	-2,495.940
	干旱度指数 Altitude above channel	0.328	36.3	-2,506.965
2.5 ≤ DBH < 7.5	海拔 Elevation	0.412	42.1	-1,340.583
	坡向 Aspect	0.432	44.7	-1,348.138
	凹凸度 Convexity	0.462	48.9	-1,360.737
	岩石裸露率 Rock-bareness rate	0.481	51.1	-1,371.831
	地形湿润指数Topographic wetness index	0.505	53.1	-1,390.343
	坡度 Slope	0.540	57.6	-1,407.893
	干旱度指数 Altitude above channel	0.540	57.8	-1,410.145
7.5 ≤ DBH < 22.5	海拔 Elevation	0.194	21.0	-448.036
	坡向 Aspect	0.267	29.5	-476.660
	凹凸度 Convexity	0.305	34.4	-490.249
	岩石裸露率 Rock-bareness rate	0.316	36.2	-492.008
	地形湿润指数Topographic wetness index	0.334	38.0	-498.367
	坡度 Slope	0.339	38.5	-507.223
	干旱度指数 Altitude above channel	0.381	43.6	-522.046
22.5 ≤ DBH	海拔 Elevation	0.263	27.4	-193.325
	坡向 Aspect	0.321	34.7	-216.574
	凹凸度 Convexity	0.326	35.4	-216.982
	岩石裸露率 Rock-bareness rate	0.335	36.5	-220.844
	地形湿润指数Topographic wetness index	0.345	37.8	-225.257
	坡度 Slope	0.392	42.8	-250.109
	干旱度指数 Altitude above channel	0.398	43.7	-251.184

径级 DBH Class (cm)	环境参数 Environmental parameters	r²_adj	累计解释偏差 Cumulative explained deviation (%)	赤池信息准则Akaike Information Criterion (AIC)
所有个体 All individuals	海拔 Elevation	0.148	16.1	-88.071
	坡向 Aspect	0.256	28.4	-130.984
	凹凸度 Convexity	0.291	33.1	-142.770
	岩石裸露率 Rock-bareness rate	0.313	36.0	-148.860
	地形湿润指数Topographic wetness index	0.314	36.4	-149.909
	坡度 Slope	0.322	37.4	-152.044
	干旱度指数 Altitude above channel	0.336	39.4	-156.461
DBH < 2.5	海拔 Elevation	0.113	12.6	-2,416.026
	坡向 Aspect	0.153	18.4	-2,425.371
	凹凸度 Convexity	0.193	22.8	-2,441.038
	岩石裸露率 Rock-bareness rate	0.266	29.7	-2,477.055
	地形湿润指数Topographic wetness index	0.303	34.0	-2,492.105
	坡度 Slope	0.311	34.9	-2,495.940
	干旱度指数 Altitude above channel	0.328	36.3	-2,506.965
2.5 ≤ DBH < 7.5	海拔 Elevation	0.412	42.1	-1,340.583
	坡向 Aspect	0.432	44.7	-1,348.138
	凹凸度 Convexity	0.462	48.9	-1,360.737
	岩石裸露率 Rock-bareness rate	0.481	51.1	-1,371.831
	地形湿润指数Topographic wetness index	0.505	53.1	-1,390.343
	坡度 Slope	0.540	57.6	-1,407.893
	干旱度指数 Altitude above channel	0.540	57.8	-1,410.145
7.5 ≤ DBH < 22.5	海拔 Elevation	0.194	21.0	-448.036
	坡向 Aspect	0.267	29.5	-476.660
	凹凸度 Convexity	0.305	34.4	-490.249
	岩石裸露率 Rock-bareness rate	0.316	36.2	-492.008
	地形湿润指数Topographic wetness index	0.334	38.0	-498.367
	坡度 Slope	0.339	38.5	-507.223
	干旱度指数 Altitude above channel	0.381	43.6	-522.046
22.5 ≤ DBH	海拔 Elevation	0.263	27.4	-193.325
	坡向 Aspect	0.321	34.7	-216.574
	凹凸度 Convexity	0.326	35.4	-216.982
	岩石裸露率 Rock-bareness rate	0.335	36.5	-220.844
	地形湿润指数Topographic wetness index	0.345	37.8	-225.257
	坡度 Slope	0.392	42.8	-250.109
	干旱度指数 Altitude above channel	0.398	43.7	-251.184

	坡度 Slope (SLO)	凹凸度 Convexity (CON)	坡向 Aspect (ASP)	地形湿润指数Topographic wetness index (TWI)	干旱度指数 Altitude above channel (ACH)	岩石裸露率 Rock-bareness rate (RBR)	胸高断面积之和 Total basal area
海拔 Elevation (ELE)	0.578^**	0.466^**	0.052	-0.701^**	0.289^**	0.450^**	-0.147^*
SLO		0.336^**	0.205^*	-0.631^**	0.220^**	0.509^**	-0.080
CON			0.025	-0.564^**	0.518^**	0.300^**	0.051
ASP				-0.098	-0.159^*	0.140^*	0.134^*
TWI					-0.629^**	-0.326^**	0.035
ACH						-0.016	0.083
RBR							0.044

	坡度 Slope (SLO)	凹凸度 Convexity (CON)	坡向 Aspect (ASP)	地形湿润指数Topographic wetness index (TWI)	干旱度指数 Altitude above channel (ACH)	岩石裸露率 Rock-bareness rate (RBR)	胸高断面积之和 Total basal area
海拔 Elevation (ELE)	0.578^**	0.466^**	0.052	-0.701^**	0.289^**	0.450^**	-0.147^*
SLO		0.336^**	0.205^*	-0.631^**	0.220^**	0.509^**	-0.080
CON			0.025	-0.564^**	0.518^**	0.300^**	0.051
ASP				-0.098	-0.159^*	0.140^*	0.134^*
TWI					-0.629^**	-0.326^**	0.035
ACH						-0.016	0.083
RBR							0.044

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