Subjects: Biology >> Botany submitted time 2023-08-26 Cooperative journals: 《干旱区研究》
Abstract： In order to explore the succession and species diversity of plant communities in the process of ganguetreatment, the text used the time-space substitution method to select the different years (2, 5, and 10 a) of ganguetreatment in Shuanglong ditch, Tianzhu Tibetan Autonomous County, Gansu Province, and the untreated gangueas the contrast (CK) sample plots . The vegetation was surveyed, and the succession characteristics and speciesdiversity of plant communities were analyzed. The results show that: (1) during the process of Shuanglong ditchgangue treatment, we identified 55 species of plants belonging to 40 genera and 24 families in 4 sample plots.Among these taxa, 15 families were single families, single genus, and single species. There were 28 species ofAsteraceae, Poaceae, and Rosaceae, which accounted for 12.5% of the total number of families and 50.91% ofthe total species. Most of the species belonged to a few families, and most plant species belonged to a singlefamily and a single genus. (2) During the years of gangue treatment, the dominant species of the communitygradually changed from annual or perennial herbs to perennial herbs and shrubs. The number of plant species inthe CK was 11, and after 5 years of gangue treatment, we identified 28 species, which decreased to 18 speciesafter 10 years of gangue treatment. Finally, Elymus nutans, Poa pratensis, and Hippophae rhamnoides becomethe dominant species in the sample plot; and these three plants comprised 48.107. (3) With increasing ganguetreatment time, the number of species, Shannon diversity index, and Margalef richness index gradually increasedfrom CK to 5 years after gangue treatment, reaching maximum values of 28, 3.506, and 2.877 respectively. ThePielou evenness index changed little, although we observed a trend of“falling- rising- falling.”In contrast, theSimpson dominance index showed a trend of“rising-falling-rising,”reaching the maximum value of 0.359 after10 years of gangue treatment. (4) The length of time of gangue treatment greatly impacted the quantitativecharacteristics of the plant population. Plant height significantly increased from CK, 2-10 a (P < 0.05). Coveragesignificantly increased from CK to 5 a and 10 a of treatment (P < 0.05). The number of plants increasedsignificantly from CK to 10 a of treatment (P < 0.05). Overall, the results indicate that years of gangue treatmentgreatly impacted vegetation succession and species diversity in the Shuanglong ditch of the eastern section ofQilian Mountains; and the plant community has gradually become single and stable.
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