Effects of environmental filtering and dispersal limitation on the β-diversity of plant communities in the south fringe of Kumtag Desert

doi:10.7522/j.issn.1000-694X.2020.00129

Journal of Desert Research ›› 2021, Vol. 41 ›› Issue (3): 147-154.DOI: 10.7522/j.issn.1000-694X.2020.00129

Effects of environmental filtering and dispersal limitation on the β-diversity of plant communities in the south fringe of Kumtag Desert

Huan Yang¹(), Yin Wang¹, Jianming Wang¹^,³, Yanguo Xia¹, Jingwen Li¹(), Xiaohong Jia², Bo Wu²

^1.School of Ecology and Nature Conservation，Beijing Forestry University，Beijing 100083，China
^2.Institute of Desertification Studies，Chinese Academy of Forestry，Beijing 100091，China
^3.Key Laboratory of Ecosystem Network Observation and Modeling，Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China

Received:2020-06-06 Revised:2020-12-30 Online:2021-05-26 Published:2021-05-26
Contact: Jingwen Li

Abstract

Abstract:

Beta diversity reflects the difference in species composition between communities. The formation and maintenance mechanism of community beta diversity has been a core issue in ecology. In this study， we investigated 60 plant communities in the south fringe of the Kumtag Desert， and combined with environmental factors and spatial distance. To analyze the impact of environmental filtering and dispersal limitation on beta diversity and components in the study area through mantel analysis and multiple regression on distance matrices （MRM）. The results showed that the plant community similarity in the south fringe of the Kumtag Desert had a significant geographical decay pattern. The species composition between the communities was quite different， and the beta diversity was high， which mainly came from the replacement. Environmental differences and spatial distance had significant effects on community beta diversity and replacement， and the response of species replacement is consistent with beta diversity. MRM analysis shows that the relative effects of environmental filtering and dispersal limitation in the formation of beta diversity are different. and the influence of environmental filtering on beta diversity and components exceeded that of diffusion. Through this study， it can be concluded that the beta diversity of plant community in the south fringe of the Kumtag Desert is mainly controlled by niche process， neutral process and other unknown processes， among which niche factors such as climate and altitude play a more important role than neutral process. In addition， the community beta diversity in the study area may be mainly caused by species replacement， and the impact of different ecological processes on the community beta diversity may be mainly achieved by regulating the community species replacement.

Key words: environmental filtering, dispersal limitation, beta diversity, replacement, nestedness, the south fringe of the Kumtag Desert

CLC Number:

Q948.15

Huan Yang, Yin Wang, Jianming Wang, Yanguo Xia, Jingwen Li, Xiaohong Jia, Bo Wu. Effects of environmental filtering and dispersal limitation on the β-diversity of plant communities in the south fringe of Kumtag Desert[J]. Journal of Desert Research, 2021, 41(3): 147-154.

Figures/Tables 6

Fig.1 Distribution of sample points in the south fringe of the Kumtag Desert

Fig.2 The distance-decay curves of plant community β- diversity in the south fringe of the Kumtag Desert

Fig.3 Summary statistics of the plant β-diversity and components in the south fringe of the Kumtag Desert

Table 1 The relationship between β-diversity or components and the environmental differences or spatial distance using Mantel tests

环境、空间	影响因素	总体	更替组分	嵌套组分
环境	温度	0.176^**	0.155^**	-0.125^NS
	降水	0.227^**	0.207^**	-0.201^NS
	海拔	0.438^***	0.369^***	-0.247^NS
空间	空间距离	0.342^***	0.347^***	-0.281^NS

Table 2 The effects of environmental factors and spatial distance on β-diversity and components of community in the south fringe of the Kumtag Desert

影响因子	影响因素	总体		更替
影响因子	影响因素	R²	P	R²	P
环境	最冷月最低温	0.049	<0.001	0.046	<0.001
	气温年较差	0.004	>0.05	0.002	>0.05
	气温日较差	0.003	>0.05	0.003	>0.05
	最干旱月降水量	0.094	<0.001	0.100	<0.001
	最干旱季降水量	0.130	<0.001	0.138	<0.001
	海拔	0.189	<0.001	0.190	<0.001
空间	空间距离	0.147	<0.001	0.156	<0.001

Fig.4 The effects of environmental differences and spatial distance on β-diversity and replacement component of plant communities

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Effects of environmental filtering and dispersal limitation on the β-diversity of plant communities in the south fringe of Kumtag Desert

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