巨型竹木塑料大棚及温度性能研究

Study on the Temperature of Wide-span Plastic Covered Tunnel Greenhouse

设施大型化可节省建筑材料、降低成本和提高栽培效益，是设施发展的方向。目前，以钢结构为主的连栋大棚建造费用较高，广大农民难以承受。根据农民的经济承受能力和栽培习惯，采用毛竹作为主要建筑材料，设计了跨度为20m、长度为100m、单栋面积为2000m^2的巨型塑料大棚，其建造成本为5384元／hm^2。对这种大棚的温度性能进行了测试，结果表明，巨型大棚在单层覆盖栽培条件下，秋延后果菜类可推迟到11月中下旬，春提早可在3月中旬定植，内加简易保温覆盖可提高气温和地温1°-2℃。

One of the development trends of protected horticulture is to increase the production area, which can save material, lower construction cost and improve culture effects. Farmers can＇t afford to build multi-span constructed mainly by steel because of high cost. Based on the reality of countryside and cultivation habit, we design wide-span plastic greenhouse constructed by bamboo. It＇s span is 20m, length 100m, the production area of single plastic tunnel greenhouse 2000m^2 and the construction cost 5384 yuan/hm^2. Under the condition of single layer, the harvesting period can last till the last ten days of November and the safe transplanting period is during the middle ten days of March. The air and 10cm soil temperature are enhanced 1-2℃ in plastic greenhouse with simple thermal screen compared with single layer plastic greenhouse.