Intraspecific and Interspecific Competition Relationship Between Ammopiptanthus mongolicus and Zygophyllum xanthoxylum in theEcotone

doi:10.7525/j.issn.1673-5102.2025.06.016

Abstract

Abstract:

In order to clarify the competitive influence of rare and endangered plant Ammopiptanthus mongolicus， this study selected the ecotone between A.mongolicus and Zygophyllum xanthoxylum， and used Hegyi single tree competition model to analyze the intraspecific and interspecific competition relationship by investigating 25 target trees of A.mongolicus. The results showed that intraspecific and interspecific competition intensity of A.mongolicus accounted for 5.09% and 94.91% of the total competition intensity（341.32）， respectively， indicating that the competition of A. mongolicus was mainly derived from interspecific competition. There were many competing tree species of A.mongolicus in the ecotone， and the competition intensity from high to low was Artemisia xerophytica， Caragana brachypoda，Z.xanthoxylum，Oxytropis aciphylla， A.mongolicus， Reaumuria trigyna， Krascheninnikovia ceratoides， Reaumuria soongarica， Potaninia mongolica， Asparagus gobicus. The relationship of the interspecific competition index and the total competition index with the crown width of A.mongolicus was approximately subject to the power function relationship， and the competition intensity decreased with the increase of crown width of target trees. When the crown width of target trees was less than 1.0 m， the competitive pressure was greater， and the obtained model could well reflect the competitive intensity of A.mongolicus.

Key words: endangered plant, Ammopiptanthus mongolicus, shrub, intraspecific and interspecific competition, competition index

CLC Number:

Q948

Lan DU, Tiejuan WANG, Xuemeng ZHOU, Rui ZHANG, Bingbing ZHANG, Jing FENG. Intraspecific and Interspecific Competition Relationship Between Ammopiptanthus mongolicus and Zygophyllum xanthoxylum in theEcotone[J]. Bulletin of Botanical Research, 2025, 45(6): 997-1002.

Figures/Tables 4

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对象木冠幅级 Target tree crown width scale/m	种内竞争 Intraspecific competition				种间竞争 Interspecific competition				总竞争 Total competition
对象木冠幅级 Target tree crown width scale/m	对象木株数 Number of target tree	竞争木株数 Number of competitive tree	竞争指数 Competition index	平均竞争指数 Averaged competition index	对象木株数 Number of target tree	竞争木株数 Number of competitive tree	竞争指数 Competition index	平均竞争指数 Averaged competition index	对象木株数 Number of target tree	竞争木株数 Number of competitive tree	竞争指数 Competition index	平均竞争指数 Averaged competition index
总计/均值 Total/mean	16	32	17.37	1.09	25	1 032	323.95	12.96	25	1 064	341.32	13.65
（0，0.5］	1	3	3.07	3.07	2	68	114.20	57.10	2	71	117.26	58.63
（0.5，1.0］	9	17	10.58	1.18	13	572	160.75	12.37	13	589	171.33	13.18
（1.0，1.5］	5	11	3.57	0.71	6	227	39.09	6.52	6	238	42.67	7.11
（1.5，2.0］	0	0	0	—	1	34	3.65	3.65	1	34	3.65	3.65
>2.0	1	1	0.15	0.15	3	131	6.26	2.09	3	132	6.41	2.14

种名 Species	株数 Number	占总株数百分比 Percentage of total number/%	平均冠幅 Average of crown width/cm	竞争指数 Competition index	平均竞争指数 Average of competition index	竞争指数百分比 Percentage of competition index/%	竞争指数排名 Competition index ranking
总计/均值 Total/mean	—	100.00	—	341.32	—	100.00	—
内蒙古旱蒿 Artemisia xerophytica	374	35.15	32.37	144.03	0.39	42.20	1
矮脚锦鸡儿 Caragana brachypoda	472	44.36	32.53	121.80	0.26	35.68	2
霸王 Zygophyllum xanthoxylum	56	5.26	98.93	32.25	0.58	9.45	3
猫头刺 Oxytropis aciphylla	108	10.15	21.56	21.99	0.20	6.44	4
沙冬青 Ammopiptanthus mongolicus	32	3.01	70.44	17.37	0.54	5.09	5
长叶红砂 Reaumuria trigyna	12	1.13	26.54	1.62	0.13	0.47	6
驼绒藜 Krascheninnikovia ceratoides	4	0.38	30.63	0.97	0.24	0.28	7
红砂 Reaumuria soongarica	2	0.19	65.25	0.88	0.44	0.26	8
绵刺 Potaninia mongolica	3	0.28	57.17	0.36	0.12	0.11	9
戈壁天门冬 Asparagus gobicus	1	0.09	6.00	0.05	0.05	0.02	10