Abstract
Community dominant plants and their ecological niche research is the focus of community ecology research. To explore the niche characteristics of desert dominant plants and the relationship between them and soil factors in Qaidam Basin, and to provide a basis for the construction of desert plant communities and the sustainable management of natural resources in Qaidam Basin. Taking 13 desert plant communities in Qaidam Basin, Qinghai Province as the research objects, this paper analyzed the characteristics of desert plant communities and dominant species based on soil physical and chemical properties, and calculated the niche width and niche overlap of dominant plants. The dominant plants are, Haloxylon ammodendron, Tamarix chinensis, Achnatherum splendens, Poacynum hendersonii, Reaumuria songonica, Phragmites australiss, Sympegma regelii, and Ajania Tenuifolia, Artemisia sphaerocephala, Ceratoides latens, Pearl russianthistle, Scirpustriquter. There were different degree of niche overlap among species in the community. In addition, CCA sequencing showed that different species had different requirements on the environment, and the distribution of dominant species was mainly affected by soil total nitrogen and soil organic matter.
Highlights
Niche refers to the position of a population in time and space in a natural ecosystem and its functional relationship with related populations[1]
Based on the determination of soil physical and chemical properties and the analysis of niche and CCA sequence of dominant species in Qaidam Basin, this study found that there were different degrees of niche overlap among species in the community
CCA sequencing showed that different species had different requirements on the environment, and the distribution of dominant species was mainly affected by soil total nitrogen and soil organic matter
Summary
Niche refers to the position of a population in time and space in a natural ecosystem and its functional relationship with related populations[1]. Grinell[3] used the concept of niche in 1917 to divide the spatial units of the environment and the position of a species in the environment. Elton[4]regards ecological niche as the status and function of species in biological community or ecosystem. Hutchinson[5] proposed the concept of N-dimensional niche, emphasizing the impact of various environmental variables on the survival of species. Colinvaux proposed the concept of species niche. Wang Gang[5] defined the generalized species niche as the mapping relationship between environmental variables and species variables
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