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中文摘要：
通过对位于青藏高原东北缘高寒草甸五个海拔梯度的土壤理化特性,微生物量碳、氮,以及室内外培养的净氮矿化的研究得出：土壤微生物量碳在各海拔间差异不显著,微生物量碳、氮分别对土壤有机碳和全氮的贡献率在不同海拔间差异显著（P〈0.05）,且均与海拔梯度呈显著负相关,说明低海拔地区有较多的营养被微生物固定,潜在的有效营养源较高;微生物量碳、氮与土壤pH值均呈显著正相关,与土壤含水量呈负相关（P〉0.05）;室内培养的氮矿化潜力大于野外原位培养的净氮矿化率,说明在室内控制的适宜的温度和湿度条件下,矿化速率较高.
英文摘要：
The soil properties,microbial biomass carbon and nitrogen,and the net N mineralization were determined on-site at 5 different altitudes in the alpine meadows on the northeastern Tibetan Plateau.The results showed that there was no significant difference for microbial biomass carbon,but there was significant difference for microbial biomass nitrogen and the contribution of C_（mic） to organic carbon and N_（mic） to total nitrogen were detected among different altitudes（P0.05）.There was a significantly positive correlation between soil pH and microbial biomass and a negative correlation between soil moisture and microbial biomass（P0.05）.The net N mineralization from the indoor incubation was larger than that from the in-situ incubation,which indicated that there would be higher N mineralization rates under the conditions of appropriate temperature and moisture.
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