中文摘要：

通过时不同植被土壤有机碳、微生物及土壤呼吸的变化规律分析得出：不同植被间土壤有机碳含量差异显著（p〈0．05）。且种植高丹草更有利于增加土壤的有机碳；不同植被闻土壤细茼数量差异显著（p〈0．05），土壤细菌数量平均值比较为：玉米〉高丹草〉苜蓿〉裸地；不同植被土壤CO2排放通量的峰值均出现在7月份，峰值大小表现为：高丹草〉苜蓿〉玉米〉裸地，不同植被间土壤CO2排放通量差异显著（p〈0．05）。

英文摘要：

This paper had sdudied the variation characteristics of soil organic carbon, soil microbial and Soil respiration on different vegetation to analyze results and come to the conclusion：there was significant difference （P〈0.05） from the soil organic carbon under different vegetation,and it was most favorable to plant sudan grass to increase soil organic carbon; there was significant difference （P〈0.05） from the soil bacteria under different vegetation,and the order of the average on soil bacteria showed maize 〉 sudan grass 〉 alfalfa 〉 bare land;the maximum value of earbondioxide emission quantity of soil planting different vegetation appeared July,and the order of peak was sudan grass〉 alfalfa〉maize 〉bare land,also,there was significant difference （P〈0.05） from the soil organic carbon under different vegetation.