<正>通过地热试验。分析了地板采暖的性能特性。结果表明：多层实木复合地板热传导的性能优良，储热与热辐射效果俱佳：呆暖地板系统的地板表面温度分布比较均匀，垂直方向温度梯度较小，呈负梯度分布，散热均匀；呆暖地板系统中，辐射热占总传热量的50%左右，较其他热传导的贡献要大；地板的尺寸稳定性较好；多层实木复合地板是优良的地热采暖材料。

After being sprayed with 10 mmol/L CaCl2, peanut seedlings were grown in the incubator at 42~C. Some physiological indexes were investigated every three hours, while the ultrastructure of the young leaves was observed. Results showed that Ca2+ could effectively inhibit chlorophyll content, decrease photosynthesis rate and improve or protect the activity of Ca2+-ATPase. U/trastructural observation showed that Ca2+ could stay the membrane structure of organelle such as chloroplast etc. to be destroyed effectively under the stress of high temperature. Caz+ could improve the heat tolerance of peanut seedlings.