Energy and Mass Balance of a Closed-type Transplant Production System (Part 2) : Water Balance
Energy and Mass Balance of a Closed-type Transplant Production System (Part 2) : Water Balance
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封闭式移植生产系统的能量和质量平衡（第二部分）：水平衡
DOI：
10.2525/jshita.12.160
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
T. Kozai
中科院分区：
文献类型：
--
作者：
K. Ohyama;K. Yoshinaga;T. Kozai
研究了人工照明条件下密闭式移栽生产系统的水分平衡。甘薯（Ipomoea batatas（L.）Lam. CV. Beniazuma）植物在第0-2、3-11和12-14天在100、200和300 μmol m-2s-1的托盘表面上的光合光子通量（PPF）下生长15天，空气温度为30 ℃，CO2浓度为1000 μmol mol mol-1，系统内的相对湿度为80/100%（光周期/暗周期），光周期为16 h d-1。由于蒸散面积和PPF的增加，日蒸散量和去湿量均随时间增加。日除湿量为蒸散水量和增湿水量之和的90- 95%.试验期间的灌溉量、蒸散量、增湿量和去湿量分别为49.5、36.7、24.3和55.9 kg m-2。在实验结束时，植物和土壤的含水量分别为1.6和10.8公斤m-2。系统的水分利用效率为0.93。这些结果表明，当除湿水再用于灌溉和加湿时，用于移植/植物生产的水量可以减少到灌溉和加湿水量的24%。因此，封闭式移植物生产系统适合于最小化移植物/植物生产中的水使用。
Water balance of the closed-type transplant production system with artificial lighting was investigated. Sweetpotato (Ipomoea batatas (L.) Lam. cv. Beniazuma) plants were grown for 15 days at photosynthetic photon flux (PPF) on the tray surface of 100, 200 and 300 μmol m-2 s-1 on days 0-2, 3-11 and 12-14, air temperature of 30°C, CO2 concentration of 1000 μmol mol-1, relative humidity of 80/100% (photoperiod/dark period) inside the system and photoperiod of 16 h d-1. Daily amounts of evapotranspirated and dehumidified water were increased with time due to increases in evapotranspiration area and PPF. Daily amount of dehumidified water was 90-95 % of the sum of evapotranspirated and humidified water. The amounts of irrigated, evapotranspirated, humidified and dehumidified water during the experiment were 49.5, 36.7, 24.3 and 55.9 kg m-2, respectively. Water contents of plants and soil at the end of the experiment were 1.6 and 10.8 kg m-2, respectively. Water utilization efficiency of the system was 0.93. These results show the amount of water use for transplant/plant production can be decreased to 24% of the amount of irrigated and humidified water when dehumidified water was reused for irrigation and humidification. Thus, the closed-type transplant production system is suitable for minimizing the water use in transplant/plant production.