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以“碧玉”黄瓜和“新品春宝”豇豆为试材,探讨2种有机种植蔬菜盛果期土壤呼吸的变化特征,对大棚内的样点进行土壤呼吸的动态监测。结果表明:在相同施肥灌溉等常规田间管理的前提下,黄瓜的土壤呼吸速率平均值高于豇豆的土壤呼吸平均值,分别为1.27μmol·m-2·s-1和0.83μmol·m-2·s-1。由于试验阶段高温导致的黄瓜土壤呼吸特征的特殊性,总体来看,黄瓜的土壤呼吸速率与土壤温湿度、大气温湿度和气压的关系走势,与豇豆的相应关系走势呈相反趋势。但是回归方程表明,黄瓜和豇豆的土壤呼吸速率分别与土壤5cm温度和大气温度的变化呈显著指数相关关系(P<0.01);黄瓜和豇豆土壤呼吸速率与土壤湿度和大气湿度呈显著线性相关关系(P<0.05);黄瓜土壤呼吸速率与大气压强相关性不显著(P>0.05),豇豆土壤呼吸速率与大气气压呈正相关,但相关性不显著。
The characteristics of soil respiration in two kinds of organic vegetables grown in full bloom period were studied with “Jasper” cucumber and “New Spring Po” cowpea as test materials, and the soil respiration in the greenhouse was monitored dynamically. The results showed that the average soil respiration rate of cucumber was higher than that of cowpea soil (1.27μmol · m-2 · s-1 and 0.83μmol · m-2, respectively) under the same field management practices such as fertigation and irrigation. · S-1. Due to the peculiarities of soil respiration during the test period, the relationship between the soil respiration rate and soil temperature and humidity, atmospheric temperature and humidity and atmospheric pressure was opposite, and the corresponding trend with the cowpea showed the opposite trend. However, the regression equation showed that the soil respiration rates of cucumber and cowpea were significantly and exponentially correlated with the changes of soil temperature and atmospheric temperature (P <0.01), and the soil respiration rates of cucumber and cowpea were significantly linearly correlated with soil moisture and atmospheric humidity (P <0.05). There was no significant correlation between soil respiration rate and atmospheric pressure in cucumber (P> 0.05). There was a positive correlation between soil respiration rate and atmospheric pressure in cowpea soil, but the correlation was not significant.