A COMPARISON OF CO-INERTIA ANALYSIS AND CANONICAL CORRESPONDENCE ANALYSIS IN PLANT COMMUNITY ORDINATION

doi:10.3773/j.issn.1005-264x.2009.05.002

Abstract

Abstract:

Aims Co-inertia analysis is infrequently used when there are few environmental variables or little collinearity among them. Ecologists usually prefer the widely used canonical correspondence analysis. Our objective was to compare the results of co-inertia analysis and canonical correspondence analysis in the ordination of a plant community in a habitat represented by few environmental variables.
Methods We compared the results of PCA-CA co-inertia analysis (PCA-CA COIA) and canonical correspondence analysis (CCA) ordination of a Phellodendron amurense community in Xiaolongmen woodland, Beijing, China. The correlation of corresponding ordination axes of two methods was measured by Spearman’s rho correlation.
Important findings PCA-CA COIA and CCA produced mostly consistent results. Both first axes were correlated with elevation, whereas the second axis of PCA-CA COIA corresponded to the third axis of CCA and the third axis of CCA corresponded to the second axis of PCA-CA COIA. The first three axes of both methods were significantly correlated with elevation, slope position, soil thickness and litter layer thickness. The eigenvalues of the ordination axes and the cumulative percentage variance of species-environment relation in PCA-CA COIA were higher than that in CCA.

Key words: ordination, co-inertia analysis (COIA), canonical correspondence analysis (CCA), Phell-odendron amurense

ZHANG Bin, ZHANG Jin-Tun, Suriguga, ZHANG Qin-Di, CHENG Jia-Jia, TIAN Shi-Guang. A COMPARISON OF CO-INERTIA ANALYSIS AND CANONICAL CORRESPONDENCE ANALYSIS IN PLANT COMMUNITY ORDINATION[J]. Chin J Plant Ecol, 2009, 33(5): 842-851.

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URL: https://www.plant-ecology.com/EN/10.3773/j.issn.1005-264x.2009.05.002

https://www.plant-ecology.com/EN/Y2009/V33/I5/842

Figures/Tables 8

References 24

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排序轴 Ordination axis
		1	2	3	4	5	6	典范特征值之和 Sum of all canonical eigenvalues
特征值 Eigenvalues	CCA	0.248	0.155	0.124	0.063	ab.	ab.	0.679
	PCA-CA COIA	0.616 9	0.353 9	0.192 8	0.067 3	0.056 8	0.049 8	1.337 5
	CCA (未降偶见种权重) (No downweighting of rare species)	0.278	0.24	0.165	0.133	ab.	ab.	0.969
对物种-环境关系方差解释的累计百分比 (%) The cumulative percentage variance of species-environment relation (%)	CCA	36.6	59.4	77.7	87.0	ab.	ab.
	PCA-CA COIA	46.1	72.6	87.0	92.0	96.3	100.0
	CCA (未降偶见种权重) (No downweighting of rare species)	28.7	53.6	70.6	84.4	ab.	ab.

排序轴 Ordination axis
		1	2	3	4	5	6	典范特征值之和 Sum of all canonical eigenvalues
特征值 Eigenvalues	CCA	0.248	0.155	0.124	0.063	ab.	ab.	0.679
	PCA-CA COIA	0.616 9	0.353 9	0.192 8	0.067 3	0.056 8	0.049 8	1.337 5
	CCA (未降偶见种权重) (No downweighting of rare species)	0.278	0.24	0.165	0.133	ab.	ab.	0.969
对物种-环境关系方差解释的累计百分比 (%) The cumulative percentage variance of species-environment relation (%)	CCA	36.6	59.4	77.7	87.0	ab.	ab.
	PCA-CA COIA	46.1	72.6	87.0	92.0	96.3	100.0
	CCA (未降偶见种权重) (No downweighting of rare species)	28.7	53.6	70.6	84.4	ab.	ab.

	CCA				PCA-CA COIA
	排序轴 Ordination axis				排序轴 Ordination axis
	1	2	3	4	1	2	3	4
海拔 ELE	-0. 821 2	-0.191 3	-0.197 0	-0.458 8	-0.625 0	-0.141 0	-0.280 9	-0.131 8
坡向 ASP	0.614 2	-0.493 5	0.202 7	-0.278 4	0.553 2	-0.195 0	-0.301 8	-0.039 2
坡位 POS	0.492 6	0.264 6	-0.786 0	-0.243 0	0.287 8	0.748 0	-0.060 6	0.317 2
坡度 SLO	-0.417 8	0.215 3	-0.050 0	0.072 0	-0.339 0	-0.012 0	0.131 3	0.821 9
土壤厚度 ST	-0.410 0	0.242 1	-0.541 0	0.198 7	-0.313 0	0.609 6	0.068 1	-0.436 6
凋落物层厚度 LT	-0.097 0	-0.612 4	-0.687 0	0.352 4	-0.083 0	0.103 8	-0.896 9	0.120 2

	CCA				PCA-CA COIA
	排序轴 Ordination axis				排序轴 Ordination axis
	1	2	3	4	1	2	3	4
海拔 ELE	-0. 821 2	-0.191 3	-0.197 0	-0.458 8	-0.625 0	-0.141 0	-0.280 9	-0.131 8
坡向 ASP	0.614 2	-0.493 5	0.202 7	-0.278 4	0.553 2	-0.195 0	-0.301 8	-0.039 2
坡位 POS	0.492 6	0.264 6	-0.786 0	-0.243 0	0.287 8	0.748 0	-0.060 6	0.317 2
坡度 SLO	-0.417 8	0.215 3	-0.050 0	0.072 0	-0.339 0	-0.012 0	0.131 3	0.821 9
土壤厚度 ST	-0.410 0	0.242 1	-0.541 0	0.198 7	-0.313 0	0.609 6	0.068 1	-0.436 6
凋落物层厚度 LT	-0.097 0	-0.612 4	-0.687 0	0.352 4	-0.083 0	0.103 8	-0.896 9	0.120 2

	CCA排序轴 Ordination axis of CCA	PCA-CA COIA排序轴 Ordination axis of PCA-CA COIA
	CCA排序轴 Ordination axis of CCA	1	2	3	4
基于环境变量坐标值 Based on the scores of environmental variables	1	1.000**	0.086	-0.429	0.143
	2	-0.086	0.657	0.771	0.086
	3	-0.086	-0.886*	0.086	-0.086
	4	0.086	0.543	0.029	0.143
基于物种数据得到的样方坐标值 Based on the sample scores from species data—a	1	0.945**	0.335	0.058	0.203
	2	-0.049	0.378	0.884**	0.032
	3	0.005	-0.808**	0.441*	-0.253
	4	-0.044	0.031	0.044	-0.208
基于环境数据得到的样方坐标值 Based on the sample scores from environment data—b	1	0.874**	0.236	0.008	-0.195
	2	0.030	0.248	0.802**	0.172
	3	0.125	-0.888**	0.587**	-0.025
	4	-0.284	0.019	-0.099	-0.029
基于物种坐标值 Based on the species scores	1	0.519**	0.172	0.422**	-0.027
	2	0.034	-0.150	0.650**	0.053
	3	-0.125	-0.407**	0.149	-0.087
	4	-0.201*	-0.031	0.038	0.046