【作者】 张旭东； 陈伟； 迟道才；

【Author】 Zhang Xudong Chen Wei Chi Daocai (College of Water Resourse Shenyang Agricultural University,Shenyang 110866,China)

【机构】 沈阳农业大学水利学院；

【摘要】 为了研究基于冠层温度的水分监测在水稻上的适用性,运用辽宁省灌溉试验站蒸渗器设置不同的水分处理进行试验,分析了沈阳地区水稻需水关键期冠气温差(Tc-Ta)的变化规律以及其与土壤水分吸力、空气饱和水汽压差(VPD)之间的相互关系,分析了灌水对水稻冠气温差的影响。结果表明:水稻的冠气温差一般为负值,因天气和水分状况而变化。当土壤水分吸力小于5kPa时,土壤水分对冠气温差没有影响,而当土水势大于5kPa时,随着土水势的增大,冠气温差变大且有变为正值的趋势,两者呈显著的线性关系;当空气的相对湿度小于70%时,冠气温差的日变化和生育阶段变化均与VPD之间呈明显的线性关系;灌水后,水稻的冠气温差在2天后达到谷值。更多还原

【Abstract】 In order to investigate the applicability of moisture monitoring based on canopy temperature in rice,some experiments of different water treatments were carried in Liaoning Province.The rule of variation of canopy-air temperature difference of rice during key water requirement periods in Shenyang region and the relationships among canopy-temperature difference,soil water pressure and air vapor pressure difference(VPD)were analysed. Furthermore,the influences of irrigation was researched.The results showed that currently being negative canopy-air temperature difference of rice changed according as weather and water conditions.The conditions of soil water has litter influence on canopy-air temperature difference when it’s value is little than 5kPa.While along with soil water pressure growing up,the canopyair temperature became bigger and a trend of positive.The linera relationship between canopyair temperature difference and VPD was patency either during key water requirement periods or in a day when the air relative humidity was little than 70%.The irrigation made the canopy-air temperature difference down to vale after tow days.更多还原