The soil respiration characteristics of alfalfa pasture in Hailar regions

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.