不同利用方式对亚高山草甸草地土壤性质和微生物的影响

The Effect of different utilization on soil property and microorganism in sub-alpine meadow

以祁连山亚高山天然草场为对象,研究了控制放牧、自由放牧、耕作3种不同利用方式和退化秃斑的草地产草量和土壤性质;并以研磨、液氮冻融法提取土壤微生物的总DNA,对其进行了初步分析。结果表明:随草地利用强度的增加草地产草量相应减少,植被中优势种发生变化,土壤有机物含量下降,pH值稍有提高,总N、总P含量同步下降,且均与有机物含量呈强相关。土壤微生物总DNA量只在退化秃斑草地呈现减少,其余尚无显著变化。

The effect of controlled grazing, free grazing, cropping and degraded bare spot of subalpine meadow in Qilian Mountain on soil property and microorganism was studied in this paper The total amount of DNA of microorganisms in the soil was extracted by grinding and the LN Freezing and Melting method The analysis result showed that with grazing intensity increasing, grass yield and soil organic matter decreased, the dominant plant species changed, pH value was slightly higher and the total content of N and P decreased simultaneously These changes were all strongly correlated with organic matter The reduce of total DNA of soil microorganisms only occurred at bare spots Key wards:natural pasture;methods of utilization;degradation;soil;microorganism;DNA