Niche and interspecific association of dominant herbaceous plants in the outer Qinhuai River,Nanjing City

doi:10.12302/j.issn.1000-2006.202206025

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2023, Vol. 47 ›› Issue (6): 203-210.doi: 10.12302/j.issn.1000-2006.202206025

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Niche and interspecific association of dominant herbaceous plants in the outer Qinhuai River,Nanjing City

LI Yuhan(), DING Yanfen(), ZHANG Changwei

College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China

Received:2022-06-18 Revised:2023-02-01 Online:2023-11-30 Published:2023-11-23

Abstract

Abstract:

【Objective】Exploring the ecological niche, interspecific association and community stability of dominant herbaceous plants in the Outer Qinhuai River will provide a theoretical basis and practical reference for the ecological restoration of vegetation and the construction of a river ecological corridor. 【Method】Based on community survey data, niche width, niche overlap, and niche similarity were used to analyze niche characteristics, total association analysis, χ² test, interspecific association coefficient (AC) value, common occurrence percentage (PC) value, Pearson’s correlation coefficient test, Spearman’s rank correlation coefficient test were used to analyze the characteristics of interspecific. 【Result】(1) A total of 124 species of herbaceous plants were identified in this survey. The niche width of Rumex acetosa was the largest. (2) The overall correlation among the dominant herbaceous species in the Outer Qinhuai River showed no significant positive association. (3) The χ²test, Pearson’s correlation coefficient test, and Spearman’s rank correlation coefficient test showed that most species pairs were not significantly correlated and the correlation among species was weak. (4) The 18 pairs showed AC value ≥0.6 and five pairs showed PC value ≥0.7, indicating that the association between dominant species was weak. (5) M. Gordon’s stability analysis indicated that the coordinates of the intersection point and stable point deviated significantly, and the community was in an unstable state. 【Conclusion】Dominant species of herbaceous plant communities in the outer Qinhuai River, Nanjing City show a wide difference in niche. The overall correlation among the dominant herbaceous species did not show a significant positive association. The interspecific structure was loose, species independence was strong, and the community was in an unstable succession stage. To improve community stability, it is necessary to strengthen the ecological restoration of the Qinhuai River basin.

Key words: the outer Qinhuai River, importance value, niche width, niche overlap, population, interspecific association, community stability, Nanjing City

CLC Number:

Q948.1
S718

LI Yuhan, DING Yanfen, ZHANG Changwei. Niche and interspecific association of dominant herbaceous plants in the outer Qinhuai River,Nanjing City[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY, 2023, 47(6): 203-210.

Figures/Tables 6

Table 1

Table 2

Niche overlap index (left diagonal) and niche similarity index (right diagonal) of dominant plants in the outer Nanjing Qinhuai River"

植物编号 No.	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
1		0.31	0.10	0.32	0.00	0.00	0.14	0.00	0.00	0.00	0.05	0.00	0.21	0.08	0.02	0.00	0.14	0.16	0.07	0.00
2	0.32		0.30	0.37	0.23	0.20	0.35	0.20	0.12	0.39	0.28	0.00	0.39	0.22	0.11	0.08	0.27	0.36	0.39	0.21
3	0.08	0.28		0.31	0.27	0.10	0.29	0.08	0.56	0.21	0.55	0.10	0.27	0.34	0.51	0.50	0.79	0.14	0.65	0.50
4	0.22	0.51	0.99		0.24	0.29	0.33	0.16	0.13	0.35	0.26	0.13	0.64	0.39	0.07	0.06	0.28	0.21	0.34	0.25
5	0.00	0.21	0.68	0.13		0.37	0.43	0.29	0.25	0.33	0.32	0.39	0.12	0.11	0.20	0.14	0.24	0.22	0.34	0.25
6	0.00	0.39	0.43	0.34	0.56		0.17	0.57	0.12	0.55	0.10	0.27	0.18	0.12	0.03	0.00	0.05	0.42	0.21	0.10
7	0.08	0.38	0.76	0.37	0.49	0.21		0.17	0.17	0.25	0.20	0.25	0.48	0.21	0.24	0.11	0.26	0.46	0.19	0.17
8	0.00	0.36	0.52	0.24	0.41	0.81	0.21		0.10	0.40	0.10	0.00	0.18	0.00	0.03	0.00	0.04	0.18	0.20	0.09
9	0.00	0.08	0.88	0.05	0.22	0.10	0.17	0.10		0.27	0.39	0.07	0.06	0.18	0.56	0.71	0.47	0.07	0.50	0.60
10	0.00	0.45	0.56	0.24	0.28	0.54	0.31	0.35	0.42		0.19	0.12	0.26	0.19	0.16	0.11	0.14	0.33	0.37	0.21
11	0.06	0.28	0.80	0.14	0.32	0.08	0.18	0.10	0.33	0.17		0.14	0.22	0.32	0.38	0.43	0.50	0.09	0.62	0.48
12	0.00	0.00	0.65	0.19	0.67	0.31	0.59	0.00	0.25	0.23	0.49		0.26	0.12	0.14	0.07	0.07	0.27	0.03	0.08
13	0.12	0.46	0.90	0.65	0.10	0.17	0.70	0.16	0.08	0.28	0.36	0.30		0.30	0.11	0.04	0.27	0.21	0.27	0.07
14	0.05	0.21	0.89	0.34	0.08	0.12	0.20	0.00	0.45	0.15	0.54	0.10	0.29		0.29	0.32	0.33	0.12	0.29	0.15
15	0.02	0.09	0.85	0.03	0.19	0.04	0.23	0.02	0.77	0.15	0.47	0.14	0.12	0.34		0.72	0.51	0.15	0.37	0.37
16	0.00	0.08	0.85	0.03	0.13	0.00	0.11	0.00	0.90	0.11	0.47	0.07	0.04	0.39	0.82		0.48	0.06	0.47	0.55
17	0.12	0.28	0.99	0.22	0.13	0.03	0.25	0.05	0.51	0.11	0.51	0.07	0.26	0.28	0.44	0.50		0.17	0.56	0.45
18	0.19	0.64	0.51	0.18	0.26	0.49	0.77	0.12	0.23	0.45	0.18	0.28	0.28	0.11	0.29	0.15	0.42		0.07	0.09
19	0.05	0.33	0.77	0.23	0.23	0.18	0.19	0.19	0.43	0.34	0.59	0.03	0.21	0.25	0.28	0.42	0.64	0.06		0.62
20	0.00	0.18	0.71	0.05	0.22	0.08	0.17	0.10	0.66	0.20	0.60	0.07	0.04	0.17	0.28	0.6	0.54	0.12	0.89

Table 2

Fig. 1

Table 3

Fig. 2

Fig.3

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编号 No.	物种 species	重要值/% importance value	生态位宽度 niche width
编号 No.	物种 species	重要值/% importance value	Levins 生态位宽度 (B_L)	Shannon 生态位宽度 (B_S)
1	芦苇Phragmites australis	4.24	1.77	0.63
2	愉悦蓼Polygonum jucunda	2.97	6.96	2.01
3	酸模Rumex acetosa	2.22	18.54	3.00
4	钻叶紫菀Symphyotrichum subulatum	2.22	4.56	1.73
5	一年蓬Erigeron annuus	2.12	5.44	1.86
6	乌蔹莓Causonis japonica	2.11	3.76	1.35
7	龙葵Solanum nigrum	1.98	6.88	1.94
8	爵床Justicia procumbens	1.94	2.64	1.03
9	黄鹌菜Youngia japonica	1.90	11.15	2.58
10	狗尾草Setaria viridis	1.84	6.19	1.88
11	野豌豆Vicia sepium	1.83	11.38	2.59
12	牛膝Achyranthes bidentata	1.81	2.96	1.09
13	无芒稗Echinochloa crus-galli var. mitis	1.74	5.24	1.72
14	鸢尾Iris tectorum	1.73	6.04	1.87
15	鹅肠菜Stellaria aquatica	1.72	9.44	2.41
16	猪殃殃Galium spurium	1.72	10.34	2.48
17	蛇床Cnidium monnieri	1.68	14.89	2.75
18	藜Chenopodium album	1.68	4.43	1.55
19	野老鹳草Geranium carolinianum	1.67	15.88	2.86
20	阿拉伯婆婆纳Veronica persica	1.65	10.59	2.54

Niche and interspecific association of dominant herbaceous plants in the outer Qinhuai River,Nanjing City

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检验方法 test methods	正联结(种对)positive association				负联结(种对)negative association
检验方法 test methods	极显著 distinctly significant (P<0.01)	显著 significant (P<0.05)	不显著 no significant (P>0.05)	合计 sum	极显著 distinctly significant (P<0.01)	显著 significant (P<0.05)	不显著 no significant (P>0.05)	合计 sum
χ²检验 χ² test	2	1	91	94	0	3	93	96
Pearson相关 Pearson’s correlation	15	13	58	86	21	20	63	104
Spearman秩相关 Spearman’s rank correlation	31	19	42	92	35	10	53	98

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