摘要
研究DFT水培条件下生菜根系的耗氧规律。结果表明:在气温为(21±1)℃的条件下,用25W水泵循环40min后,水培箱中营养液的溶氧达到饱和点7.9mg/L;生菜根系白天的耗氧量远大于晚上的,晚上的耗氧量可以忽略不计;单株根系耗氧速率随着生菜叶面积的增大而增加;营养液开泵循环的间隔时间=(7.9-4.5)mg/L×营养液体积(/单株根系耗氧速率每箱栽培生菜株数),其中,单株根系的耗氧速率可以根据回归方程y=0.009x+0.1011(R2=0.9966)计算(X代表不同时期的叶面积,Y代表单株根系的耗氧速率)。
In this experiment,the consuming oxygen law of the roots about lettuce in DFT was studied,the conclusions are as follows：The density of the dissolved oxygen would reach saturation point：7.9mg/L,when the nutrition solution was circulated for 40 minutes by a water pump with the power of 25 W;The oxygen consumption capacity of the roots about lettuce in the day was more than that in the evening,Even the oxygen consumption in the evening can be neglected;The larger the leaf area is,the oxygen consumption velocity per plant is increasing with the leaf area ;The interval time of the water pump circulation =（7.9～4.5 ml/L）×the volume of the solution/（the oxygen consumption velocity per plant roots ×the number of the lettuces per box）.Among them,the oxygen consumption velocity per plant can be calculated according to the regression equation：y=0.009 x＋0.1011（R^2= 0.996 6）,（x represents leaf area in different periods,y represents the oxygen consumption velocity per plant roots）
出处
《热带作物学报》
CSCD
2007年第3期19-22,共4页
Chinese Journal of Tropical Crops
基金
华南热带农业大学科技基金项目(编号:Rnd0415)资助
关键词
DFT
生菜
根系耗氧规律
DFT lettuce oxygen consumption lawof the roots
