Subjects: Biology >> Ecology submitted time 2023-08-25 Cooperative journals: 《干旱区研究》
Abstract： The soil properties and moss crust development indices in typical Artemisia ordosica and Salixpasmmophia shrub land plots in the sandy area of Mu Us Sandland have previously been analyzed in combinationwith allelopathic tests of the extracts from the different shrub organs. The results showed that moss crust developmentin A. ordosica shrub land was better than that in S. pasmmophia shrub land, but the reason is unclear, andelucidating it is the aim of this investigation. A significant difference in the moss crust coverage between the twokinds of shrubs (P < 0.05) was identified. The total moss crust coverage and sub-canopy and inter-canopy crustcoverage were as follows: A. ordosica > S. pasmmophia, and the total moss crust coverage and subcanopy and intercanopycrust coverage in the A. ordosica shrub land were 1.6, 2.9, and 1.1 times higher than those in the sandS. pasmmophia shrub land, respectively. Furthermore, there was no significant difference in moss crust thicknessbetween the two kinds of shrubs (P > 0.05). Pearson correlation analysis showed that the moss crust coverage inthe sub-canopy was significantly positively correlated with the soil water content, moss crust thickness in the subcanopywas significantly positively correlated with silt content, and inter-canopy moss crust coverage was significantlypositively correlated with soil water and clay content (P < 0.05). The higher soil water, clay, and silt contentsin the A. ordosica shrub land promoted the development of moss crusts. The aqueous extracts from the roots,stems, and leaves of the A. ordosica and S. pasmmophia inhibited the development of moss crusts; that is, the allelopathicsynthesis effect (SE) was negative. Specifically, the allelopathic inhibitory effect of the 0.2 g·mL-1 aqueousextract of the S. pasmmophia leaves was the strongest, with an SE of −0.95. The inhibitory effect was significantlyhigher than that of the A. ordosica leaves (SE = −0.65). It can be inferred from the results that the highersoil water, clay, and silt contents in the A. ordosica shrub land and the significant allelopathic inhibition of the S.pasmmophia leaves on the moss crusts led to the improved development of moss crusts in A. ordosica shrub landwhen compared with S. pasmmophia shrub land.
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