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对压砂地不同利用年限下的土壤微生物群落结构及功能多样性进行了分析。研究结果表明,压砂地不同利用年限的土壤微生物群落总菌数整体上明显低于农田对照,且随着压砂利用年限的增加土壤微生物总菌数呈逐年下降的趋势。压砂利用1~3a,5~10a,10~15a之间均存在显著差异(p<0.05)。压砂第1a对土壤微生物的功能影响很大,能明显提高微生物对C源的利用能力。压砂1a后,随着压砂利用年限的增加土壤微生物的功能明显下降,且不同压砂年限间的微生物功能差异不显著,说明农田压砂初期由于土地利用方式的改变,提高了土壤蓄水保墒及增温效果,使得土壤微生物物功能和利用强度增加,随着压砂地利用年限的增加作物对土壤养分消耗增大,而土壤中养分得不到补充,使得压砂地土壤微生物环境逐步恶化。
The structure and functional diversity of soil microbial community under different utilization years of sand were analyzed. The results showed that the total number of soil microbial community in different years of use of sand was significantly lower than that of farmland control, and the total number of soil microorganisms showed a declining trend with the increasing use life of sand. There was a significant difference (p <0.05) between the use of sand for 1 ~ 3 years, 5 ~ 10 years and 10 ~ 15 years. The effect of pressure sand 1a on the function of soil microorganisms is great, which can obviously improve the ability of microorganisms to utilize C sources. After the sand was pressed, the function of soil microbes decreased obviously with the increase of the useful life of sand, and the difference of microbial function between different years was not significant, which indicated that the soil water storage was increased due to the change of land use pattern in the early stage of sandstorm. Soil moisture and warming effect make the function and utilization intensity of soil microbial biomass increase. With the increase of the use life of sandstone, the nutrient consumption of crops increases, but the nutrients in the soil are not supplemented, which makes the soil microbial environment in the sandstorm deteriorate gradually.