Effects of taxonomic and phylogenetic diversity of resident Pinus yunnanensis communities on Ageratina adenophora invasion in the Panxi region, Sichuan Province

doi:10.17520/biods.2020485

Abstract

Abstract:

Aim: Alien plant invasion seriously threatens diversity of native plants and ecosystem function. Understanding the underlying mechanisms of plant invasion could help to prevent and control alien plant invasion.
Methods: In this study, we selected Ageratina adenophora, an invasive herb invaded in Pinus yunnanensis communities in Panxi region of China, as target species. Based on field investigation, we assessed the effects of environmental factors and community characteristics such as species diversity and phylogenetic diversity on the invasion of A. adenophora.
Results: We found that neither environmental factors (i.e. altitude, slope, and fire severity) nor biological factors (i.e. canopy closure and shrub coverage) have significant effect on the intensity of A. adenophora invasion. However, our results demonstrate that the invasion intensity of A. adenophora was significantly impacted by the species diversity of shrub layer (P < 0.05) and the net relatedness index of herb layer to A. adenophora (P < 0.05).
Conclusion: The communities with higher species diversity of shrub layer and more closely related to A. adenophora of herb layer were less likely to be invaded, indicating that A. adenophora invasion could be inhibited by competition for light with shrubs, and also be inhibited by competition for nutrition and occupation with its closely relatives.

Key words: plant invasion, species diversity, net relatedness index, community invisibility

Xu Chen, Guoyan Wang, Peihao Peng, Jingji Li, Songlin Shi, Tingbin Zhang. Effects of taxonomic and phylogenetic diversity of resident Pinus yunnanensis communities on Ageratina adenophora invasion in the Panxi region, Sichuan Province[J]. Biodiv Sci, 2021, 29(7): 865-874.

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URL: https://www.biodiversity-science.net/EN/10.17520/biods.2020485

https://www.biodiversity-science.net/EN/Y2021/V29/I7/865

Figures/Tables 4

References 56

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环境变量 Environmental variables	PC1	PC2
海拔 Altitude	0.29	-0.43
纬度 Latitude	-0.42	-0.13
坡向 Aspect	0.25	-0.21
坡度 Slope	-0.26	0.34
土壤温度 Soil temperature	0.51	-
土壤湿度 Soil moisture	0.53	-
火烧强度 Fire intensity	0.17	0.36
冠层郁闭度 Canopy closure	-	-0.46
灌木层盖度 Shrub coverage	-	-0.25
草本层盖度 Herb coverage	0.17	0.47
变异解释量 Proportion of variance (%)	57.85	23.46

环境变量 Environmental variables	PC1	PC2
海拔 Altitude	0.29	-0.43
纬度 Latitude	-0.42	-0.13
坡向 Aspect	0.25	-0.21
坡度 Slope	-0.26	0.34
土壤温度 Soil temperature	0.51	-
土壤湿度 Soil moisture	0.53	-
火烧强度 Fire intensity	0.17	0.36
冠层郁闭度 Canopy closure	-	-0.46
灌木层盖度 Shrub coverage	-	-0.25
草本层盖度 Herb coverage	0.17	0.47
变异解释量 Proportion of variance (%)	57.85	23.46

因子 Factor	数值范围 Numerical ranges	χ²	P
第一主成分 First principal component	-3.35 to 3.16	0.23	0.63
第二主成分 Second principal component	-3.02 to 3.43	0.72	0.39
灌木层Shannon-Wiener指数 Shannon-Wiener index of shrub layer	0.14-2.26	4.06	0.04^*
灌木层净种间亲缘关系指数 Net relatedness index of shrub layer	-1.27 to 3.11	0.46	0.49
灌木层目标物种净种间亲缘关系指数 Net relatedness index of shrub layer to the target species	-1.29 to 2.39	0.05	0.81
草本层Shannon-Wiener指数 Shannon-Wiener index of herb layer	0.93-2.37	1.99	0.15
草本层群落净种间亲缘关系指数 Net relatedness index of herb layer	-1.32 to 1.31	3.21	0.07
草本层目标物种净种间亲缘关系指数 Net relatedness index of herb layer to the target species	-1.74 to 1.44	4.28	0.03^*

因子 Factor	数值范围 Numerical ranges	χ²	P
第一主成分 First principal component	-3.35 to 3.16	0.23	0.63
第二主成分 Second principal component	-3.02 to 3.43	0.72	0.39
灌木层Shannon-Wiener指数 Shannon-Wiener index of shrub layer	0.14-2.26	4.06	0.04^*
灌木层净种间亲缘关系指数 Net relatedness index of shrub layer	-1.27 to 3.11	0.46	0.49
灌木层目标物种净种间亲缘关系指数 Net relatedness index of shrub layer to the target species	-1.29 to 2.39	0.05	0.81
草本层Shannon-Wiener指数 Shannon-Wiener index of herb layer	0.93-2.37	1.99	0.15
草本层群落净种间亲缘关系指数 Net relatedness index of herb layer	-1.32 to 1.31	3.21	0.07
草本层目标物种净种间亲缘关系指数 Net relatedness index of herb layer to the target species	-1.74 to 1.44	4.28	0.03^*