不同苜蓿品种人工草地土壤呼吸及对土气温度反应

Soil Respiration Characteristic and Response to Soil-atmosphere in Different Alfalfa Rangeland

用便携式土壤呼吸测定仪(Li-6400)测定不同苜蓿品种人工草地的土壤呼吸,并同步测定土壤层的温度、大气温度和土壤含水量。结果表明:5个苜蓿品种土壤呼吸速率日变化总体呈"双峰"曲线,黄花苜蓿、龙牧801和肇东苜蓿草地土壤呼吸的日最高值出现在6:00,最低值分别出现在14:00,8:00和12:00,俄罗斯苜蓿和杂花苜蓿草地土壤呼吸速率最大值均出现在8:00,最低值出现在14:00和12:00;5个苜蓿品种草地土壤呼吸速率值,总体变化趋势是杂花苜蓿>肇东苜蓿>黄花苜蓿、俄罗斯苜蓿>龙牧801;土壤呼吸与土壤温度呈线性正相关,与大气温度呈一元二次线性正相关。

The soil respiration rate was measured by Li-6400,at the same time,soil temperature,air temperature and soil water content were measured in different alfalfa rangeland.The results showed that the soil respiration rate change of five alfalfa varieties appeared ＂double-peak＂ curve,the maximum of soil respiration rate was at 6：00 of M.sativa L.cv.Huanghua,M.sativa cv.Longmu 801 and M.sativa cv.Zhaodong,and the lowest at 14：00,8：00 and 12：00,respectively,the maximum soil respiration rate of M.sativa L.cv.Original seed variegated alfalfa,M.sativa cv.Variegated alfalfa,both appeared 8：00,and the lowest appeared 14：00 and 12：00;The change trend of five alfalfa rangeland was M.sativa cv.Variegated alfalfaM.sativa cv.ZhaodongM.sativa L.cv.Huanghua,M.sativa cv.RussianM.sativa cv.Longmu 801;soil respiration rate had a significant positive correlation with the soil temperature,and there was a one-place quadratic correlation between soil respiration rate and air temperature.