【摘要】 对兰州南北两山5类乔灌木林草地土壤养分和土壤微生物空间分布进行了研究,结果表明,1)柠条林地的土壤有机质,全氮含量相比其他类型林地显著增加(P<0.05),其土壤化学性质明显改善;土壤养分含量在所研究林草地的排序为:柠条类>柽柳类>枸杞类>红砂类>侧柏类;并且柠条林地中土壤三大类微生物(细菌、真菌和放线菌)的数量也最多。2)由于土壤有机质等因素影响,不同林草地的土壤养分含量与微生物数量在土壤剖面上具有相似的垂直分布特征,均随着土层深度增加而减少。其中0～10cm土层土壤微生物数量占总量的47.86%。3)植被类型、土壤养分和土壤微生物群落三者之间存在着一定的互作关系。更多还原

【Abstract】 The spatial distribution of soil nutrients and soil microbes in five arbores-bushes-grass lands at the south-north hills in Lanzhou was studied.The results showed that:1) the soil organic matter and total N content in the soil of Caragana korshinskii land were significantly larger than lands of Tamarix austromongolica,Lycium chinense,Reaumuria soongorica and Platycladus orientalis types (P<0.05),the soil chemical property was improved.The ranking of the soil nutrient contents was C.korshinskii type>T.austromongolica type>L.chinense type>R.soongorica type>P.orientalis type.The amount of soil microbes was the most abundant at the C.korshinskii type land.2) The quantity of microbes and nutrient content clearly decreased with the soil depth in the different land because of soil fertility factor.The quantity of microbes in the 0-10 cm layer was 47.86% of total microbes.3) The interaction was existed among vegetation,soil nutrient and soil microbial quantity in some extend.更多还原