Effects of Leaf Area Index of Tomato Seedling Populations on Energy Utilization Efficiencies in a Closed Transplant Production System
Effects of Leaf Area Index of Tomato Seedling Populations on Energy Utilization Efficiencies in a Closed Transplant Production System
复制标题
封闭式移栽生产系统番茄苗群体叶面积指数对能量利用效率的影响
DOI：
10.2525/jshita.15.231
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
C. Kubota
中科院分区：
文献类型：
--
作者：
S. Yokoi;T. Kozai;K. Ohyama;Tomoyuki Hasegawa;C. Chun;C. Kubota
光合有效辐射（PAR）能量利用效率的计算方法是用植物体内固定的化学能除以植物种群顶部测量的PAR能量，再除以灯表面总PAR能量的理论值。以系统消耗的总电能为分母，计算了封闭式移栽生产系统的电能利用效率埃厄。以番茄穴盘苗为材料，在气流速度为0.53±0.07ms-1，CO2浓度为1040±50 μ mol mol-1的封闭系统中培养20 d，研究了番茄幼苗群体叶面积指数（LAI）对PUEP、FUEL和埃厄的影响。本研究期间PUEP、FUEL和埃厄的最大值为0。10、0。075和0。015，当叶面积指数达到最大值2。4. PUEP的最大值（0. 10)比Beadle和Long（1985）报道的在环境CO2浓度下生长的C3植物的理论最大值大。结果表明，一个封闭的系统是节能的移栽生产和效率可以更高的种植密度和优化的气流速度和CO2浓度。
PUEp and PUEL, photosynthetically active radiation (PAR) energy utilization efficiencies were calculated by dividing the chemical energy fixed in plants by the PAR energy measured at the top of plant populations and by the theoretical value of total PAR energy on lamp surfaces, respectively. EUE, electric energy utilization efficiency of a closed transplant production system, was also calculated using the total electric energy consumed in the system as a denominator. Tomato seedlings on plug trays were grown for 20 days in the closed system in which air current speed and CO2 concentration were controlled at 0.53±0.07ms-1 and 1040±50 itmol mol-1, respectively, and the effect of leaf area index (LAI) of tomato seedling populations on PUEP, FUEL and EUE were investigated. The maximal values of PUEP, FUEL, and EUE during the present study were 0. 10, 0. 075 and 0. 015, respectively, which were obtained when the LAI reached the maximal value of 2. 4. The maximal value of PUEP (0. 10) obtained in the present study was greater than the theoretical maximal value that Beadle and Long (1985) reported for C3 plants grown under ambient CO2 concentration. Results suggest that a closed system is energy efficient for transplant production and the efficiency could be even higher with a greater planting density and optimized air current speed and CO2 concentration.