在强光高温的逆境条件下，塑料遮阳网覆盖可降低光照强度、气温和土温，提高土壤含水量和株间相对湿度，明显改善了生态条件，其中光强为限制因子。覆盖可提高叶绿素含量和净光合速率、降低蒸腾强度、改善植株的水分状况。光饱和点可作为科学选网和盖揭网的时间参数。关键词 Under the conditions of high light and high temperature, the plastic shade net coverage can reduce the light intensity, air temperature and soil temperature, improve the soil water content and inter-plant relative humidity, and obviously improve the ecological conditions, of which the light intensity is the limiting factor. Coverage can increase chlorophyll content and net photosynthetic rate, reduce transpiration and improve plant water status. Light saturation point can be used as a scientific selection network and cover the network time parameters. Key words