摘要
2008年8—9月,在滴灌技术条件下,利用包裹式茎流仪监测了核桃树的液流量,并用Watchdog自动气象站和土壤水分观测仪对气象因素和土壤水分进行同步观测。结果表明:核桃树的液流速率日变化曲线呈单峰,随着太阳辐射的增强液流速率上升,液流速率达到最大值的时间比太阳辐射达到最强的时间要早1～2 h。液流速率与冠层风速、大气温度、相对湿度、太阳辐射具有良好的相关性,复相关系数为0.75,影响核桃树液流的主要气象因子是太阳辐射。利用包裹式茎流仪测得的核桃树的液流量与利用Penman-Monteith公式计算的参考作物蒸发蒸腾量累计值变化曲线呈现相似的变化趋势。
From August to September 2008,Dynagamax was used to monitor sap flow of walnut trees,under the conditions of drip irrigation technique.Meanwhile,Watchdog Automatic Weather Station and TRIME-IPH were used to measure meteorology factors and soil water content.The results showed that,daily variation regularity of sap flow is expressed in a single peak curve.Sap flow velocity increases with solar radiation intensifying.The time of sap flow velocity of highest value is 1-2 hours earlier than that of solar radiation.There exists better correlation among the sap flow velocity,wind velocity,air temperature,relative humidity and solar radiation.The multiple correlation coefficient is 0.75.The main influence meteorological factor is solar radiation（Rn）.The change curve of cumulative data measured of sap flow velocity which used dynagamax and calculation ET0 by Penman-Monteith formula is similar.
出处
《人民黄河》
CAS
北大核心
2011年第11期114-116,共3页
Yellow River
基金
"十一五"国家科技支撑计划项目(2007BAD38B02)
新疆自治区重大专项(200731136-5)
新疆科技支疆项目(200991237)
关键词
滴灌
液流
蒸发蒸腾量
气象因素
核桃树
drip irrigation
sap flow
evapotranspiration
meteorological factor
walnut tree
