Response of Available Soil Trace Element Stoichiometry to Vegetation Restoration in Photovoltaic Power Station
[Objective]The content and stoichiometric ratio of available trace elements in soil under different vegetation types in photovoltaic power plants were explored to provide a theoretical basis for accelerating the vegetation restoration of photovoltaic power stations in arid areas of Western China.[Methods]The soil of four vegetation types in the photovoltaic agriculture,forestry and animal husbandry demonstration base of Tumd Left Banner in Hohhot City,Inner Mongolia was taken as the research object,and the available trace elements and ecological stoichiometry characteristics of different vegetation soils were analyzed.Four vegetation types,namely natural vegetation,Pinus sylvestris,Astragalus membranaceus,and Medicago sativa,were selected to determine the nutrient status of the 0-20 cm and 20-40 cm soil layers.[Results]① There were significant differences in the soil available trace elements among the four vegetation types,and the content of available trace elements was low.② For the four vegetation types,the content of available trace elements in soil followed the order A.membranaceus plot＞M.sativa plot＞P.sylvestris plot＞natural vegetation plots.③ The chemical ratios of the soil trace element effective contents in the study area were 0.96,31.95,4.07,33.50,4.30 and 0.15 for Fe∶Mn,Fe∶Cu,Fe∶Zn,Mn:Cu,Mn∶Zn and Cu∶Zn,respectively.④ The soil trace nutrients in the study area were Fe,Mn,and Cu deficiencies;Fe was the main trace element limiting factor,and Mn and Cu were secondary limiting factors.[Conclusion]At the same time as vegetation restoration in this area,it is necessary to add micro-fertilizer appropriately,which can improve soil fertility to a certain extent and provide sufficient micronutrients for vegetation restoration in the study area.
photovoltaic power stationvegetation restorationtrace elementsstoichiometric ratio
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