甘南高寒草甸植物群落物种多度分布特征

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Abstract The response of species abundance distribution (SAD) pattern of alpine meadow plant community to altitude gradient was analyzed, and the formation rule and maintenance mechanism of species diversity were discussed. In this paper, the typical sample plot survey method was used to collect data, and the experimental data were fitted and analyzed by RAD (rank abundance distribution) software package. The results showed that the species diversity of plant community showed a "Hump relationship" pattern with the increase of altitude, and reached the maximum at 3500m. Five models were used to fit the SAD on the altitude, it was found that the overall SAD of alpine meadow plant community was in line with the niche model, especially the geo. The model could be used to fit the distribution pattern of community species abundance, and it also showed that niche differentiation plays a major role in the SAD of alpine meadow plant community. The best fitting model of common SAD was geo, which was consistent with the best fitting model of overall species, while the best fitting model of rare SAD was rane. The above results showed that common species were the main factors affecting the SAD pattern of communities at different altitudes, and they played an irreplaceable role in maintaining the productivity and stability of communities. However, rare species also affected the community structure to a certain extent because of their unique functional characteristics, and they maintain the stability of species diversity of alpine meadow communities in different ways.

Key words： alpine meadow species abundance niche model common species rare species niche differentiation

Received: 30 July 2020

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X176

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	Articles by authors
	LIU Min-xia
	ZHANG Ya-ya
	LI Quan-di
	LI Bo-wen
	SUN Rui-di
	SONG Jia-ying

Cite this article:

LIU Min-xia,ZHANG Ya-ya,LI Quan-di等. Species abundance distribution characteristics of alpine meadow plant community in Gannan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1405-1414.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1405

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