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中文摘要：
以不同生长年限的紫花苜蓿（Medicagosativa L.）人工草地为研究对象,于2008年分别测定了生长1~5年的紫花苜蓿人工草地土壤的微生物生物量碳和微生物氮、土壤养分和微生物数量。结果表明：不同生长年限的紫花苜蓿人工草地土壤微生物特性及其养分含量存在差异,其中以生长4年的各项指标为最高;土壤表层微生物碳、氮含量高于土层10~20 cm中的含量,土壤养分存在＂表聚＂现象;表层土壤微生物数量高于10~20 cm土层,固氮菌占优势,真菌的数量较少;土壤有机质含量影响土壤微生物碳、氮含量,微生物碳与土壤速效钾（P〈0.05,r=0.916）、微生物氮与速效磷均存在显著正相关（P〈0.05,r=0.995）。
英文摘要：
Alfalfa grasslands of different growth years were selected as test objects.Soil microbial carbon（MBC）and nitrogen（MBN）,soil nutrient and soil microbial quantity were measured in 2008.There were differences in soil microbial characteristic and soil nutrients of alfalfa grassland among different planting years.All tested indices in fourth-year alfalfa grassland were the highest when compared with other year grasslands.MBC and MBN contents of the soil surface were higher than that under soil（10～20 cm）.Soil nutrients displayed a phenomenon of ＂surface accumulations＂.The microbial numbers of soil surface were higher than that in 10～20 cm soil layer.Azotobacter was a dominant species of soil microbes among fungi.Soil organism content influenced MBC and MBN.There were significant positive correlations between MBC and available potassium,MBN and available phosphorus,respectively.
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