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中文摘要：
使用便携式土壤呼吸测定仪（Li-6400）测定不同苜蓿品种栽培草地的土壤呼吸,并同步测定植株根系形态指标、土壤层温度、大气温度和土壤含水量。结果表明,黄花苜蓿（Medicago falcata）、龙牧801（M.sativacv.Longmu801）和肇东苜蓿（M.sativacv.Zhaodong）草地土壤呼吸的日最高值均出现在6：00,最低值分别出现在14：00、8：00和12：00,杂花苜蓿（M.varia）草地土壤呼吸速率最大值出现在8：00,最低值出现在14：00;4个苜蓿品种草地土壤呼吸速率值总体变化趋势是肇东苜蓿〉黄花苜蓿、杂花苜蓿〉龙牧801;土壤呼吸与植株根系、土壤温度呈线性正相关,与大气温度呈一元二次函数正相关,与土壤含水量呈负相关。
英文摘要：
A field survey was conducted to measure the soil respiration rate of alfalfa varieties pasture（Huanghua,Longmu801,Zahua and Zhaodong） by using Li-6400 and to measure root morphology,soil temperature,air temperature and soil water content.The results of this study showed that Huanghua,Longmu801 and Zhaodong showed the maximum of soil respiration rate at 6：00 and the minimum of soil respiration rate at 14：00,8：00 and 12：00,respectively.The maximum soil respiration rate of Zahua was found at 8：00,and the minimum of soil respiration rate of Zahua was found at 12：00.The soil respiration rate among 4 alfalfa pasture was ZhaodongHuanghua and ZahuaLongmu 801.Soil respiration rate was significantly liner positive correlation with the soil temperature and root system,and was one place quadratic correlation air temperature,and had negative correlation with soil water content.
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