Effects of Vegetation Restoration and Litter Degradation on Soil Microbes in Alpine Sandy Region
This study focused on the soil beneath the artificially-fixed sand vegetation of Caragana mi-crophylla in the sandy area of Gonghe Basin.The nylon mesh bag method was employed to simulate the natural degradation of litter,and traditional microbial culture methods were used to investigate the microbial composi-tion and quantity.Additionally,soil composition and nutrient content were measured.The results revealed that with the prolongation of vegetation restoration time and the increase in litter decomposition days,bacteria re-mained the dominant microbial population in the soil.The total numbers of soil bacteria,fungi,actinomycetes,and microorganisms in all vegetation restoration areas were higher than those in the mobile sandy land.Overall,the total numbers of soil bacteria,fungi,actinomycetes,and microorganisms increased with the extension of vegetation restoration years.As the decomposition time of litter prolonged,the total numbers of soil bacteria,fungi,actinomycetes,and microorganisms initially increased and then decreased.Additionally,the content of soil clay and silt particles gradually increased,along with the contents of organic matter,total nitro-gen,available nitrogen,available phosphorus,and available potassium.Both forest age and litter degradation had significant impacts on microorganisms.Among them,forest age was the most important factor influencing the quantity of soil microorganisms,while litter degradation was the most significant factor affecting microbial composition.The sand control model in the study area facilitates the accumulation of soil microbial popula-tions,which is beneficial for vegetation restoration and sustainable development of the ecosystem.
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