Grassland community species diversity and aboveground biomass responses to difference in cover soil thickness in restoration after mining damage

doi:10.11686/cyxb2016072

Abstract

Abstract: This experiment examined different options for restoration of damaged steppe vegetation in the Kurt Kizu mining area, Xinjiang province, China. Different depths of cover soil (0, 10, 14, and 18 cm) were applied to mine-damaged steppe, and ground cover, height, aboveground biomass and species richness, diversity and evenness of the vegetation were measured. Key results were: 1) The number of species present and the diversity were highest when cover soil was applied at a thickness of 14 or 18 cm. The cover, height, and aboveground biomass of the vegetation generally increased with the thickness of cover soil, but the differences between 14 and 18 cm cover soil thickness were not statistically significant. 2) Species richness indices (R and Ma) ranked: 14 cm cover soil thickness>10 cm cover soil thickness>18 cm cover soil thickness>0 cm cover soil thickness, while diversity indices (D and H') ranked: 14 cm cover soil thickness>18 cm cover soil thickness>10 cm cover soil thickness>0 cm cover soil thickness. The community evenness indices (J_sw and Ea) showed an inverse ranking to richness and diversity with 0 cm cover soil thickness>18 cm cover soil thickness>10 cm cover soil thickness>14 cm cover soil thickness. 3) There was a low positive correlation between community productivity and Shannon-Wiener and Simpson indices. Therefore, for the Kurt Kizu mining area, considering economic cost against ecological benefits when restoring damaged steppe, the appropriate cover soil thickness for ecological restoration of grassland vegetation is 14 cm.

SUN Yong-Xiu, YAN Cheng, XU Hai-Liang, YAO Yan-Li. Grassland community species diversity and aboveground biomass responses to difference in cover soil thickness in restoration after mining damage[J]. Acta Prataculturae Sinica, 2017, 26(1): 54-62.

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