塑料大棚内土壤的热特性

根据塑料大棚内外土温的实测资料,计算了棚内外土壤平均铅直热通量的日变化,全天正、负热通量及总热通量的累积值,以及平均土温的日变化.同时,计算了平均横向和铅直土温梯度的日变化,并对闭、揭膜两种条件下日变化的差异作了对比分析.

SOIL HEAT PROPERTIES IN PLASTIC GREENHOUSE

In the article, on the basis of the data of soil timperature measured inside and outside of the plastic greenhouse, calculations were made inside and outside the greenhouse, about the daily change of average vertical soil heat fluxes, the sums of positive, negative and whole day soil heat fluxes as well as the daily change of average soil temperatures. In addition, the daily change of average horizontal and vertical gradients of soil temperature in the greenhouse were calculated. And comparision was made about the differences of the daily change between the closed and opened greenhouses.