摘要
为探究阿克苏市郊区沙地滴灌枣园蒸散特征,基于涡度系统和自动气象站设备,获取2017年阿克苏市郊区沙地滴灌枣园的蒸散数据,同时结合常规气象观测数据,分析了枣园全生育期蒸散变化。结果表明,不同外界条件下,沙地枣园不同生育期蒸散量日动态均呈现先增大后减小变化特征,灌水当天比晴天变化幅度略高;阴天蒸散幅度低于晴天蒸散幅度;雨天在降雨停止后的蒸散量变化幅度高于晴天;降雨后1d与晴天蒸散量变化特征基本一致。枣树各生育期日动态蒸散启动与停止时间不同;2017年不同生育期蒸散量大小为:果实发育期>花期>成熟期>萌芽期;不同时间尺度下环境因子对蒸散影响由强到弱的排序为太阳辐射>饱和水汽压差>空气温度>相对湿度>地表土壤温度>风速>土壤热通量(0.5h时间尺度),空气温度>地表土壤温度>叶面积指数>太阳辐射>饱和水汽压差>土壤含水率>相对湿度>土壤热通量(1d时间尺度);对蒸散量与气象因子、叶面积指数与土壤含水率在不同时间尺度下拟合多元线性回归方程。阿克苏市郊区滴灌枣园日蒸散动态受不同外界条件影响,果实发育期和花期为枣园蒸散量最大的关键期,建议保证枣树果实发育期和花期给水量充足;叶面积指数与土壤含水率可以提高拟合方程的拟合度,为该地区滴灌沙地枣园灌溉提供参考。
To explore the evapotranspiration characteristics of drip irrigation jujube orchards in the sandy land of Aksu suburbbased on vorticity system and automatic weather station equipment,evapotranspiration data of jujube orchards drip irrigation in sandy land of Aksu suburb in 2017 were obtained.Meanwhile,combined with conventional meteorological observation data,the change of evapotranspiration in jujube orchards during the whole growth period was analyzed.The results showed that under different external conditions,the diurnal dynamics of evapotranspiration in different growth stages of jujube orchards in sandy land increased first and then decreased.The change trend and range of evapotranspiration on irrigated day were slightly higher than those on sunny day;the change range of evapotranspiration on cloudy day was lower than that on sunny day;the change range of evapotranspiration on rainy day was higher than that on sunny day;the change characteristics of evapotranspiration on rainy day were basically the same as those in sunny days.The starting and stopping time of daily dynamic evapotranspiration were different in different growth stages of jujube trees.The evapotranspiration of different growth stages in 2017 was as follows:fruit development stage﹥flowering stage﹥mature stage﹥germination stage.The order of environmental factors affecting evapotranspiration at different time scales was solar radiation﹥saturated water vapor pressure difference﹥air temperature﹥relative humidity﹥surface soil temperature﹥wind speed﹥soil heat flux(zero point five hour time scale),air temperature﹥surface soil temperature﹥leaf area index﹥solar radiation﹥saturated water vapor pressure difference﹥soil moisture﹥relative humidity﹥soil heat flux(one day time scale).The multiple linear regression equation was fitted with the dispersal and meteorological factors,leaf area index and soil water content at different time scalesIn conclusion,the daily evapotranspiration dynamics of drip irrigation jujube orchards i
作者
郑明
赵经华
马英杰
洪明
ZHENG Ming;ZHAO Jing-hua;MA Ying-jie;HONG Ming(College of Water Conservancy and Civil Engineering,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《新疆农业大学学报》
CAS
2018年第3期196-203,共8页
Journal of Xinjiang Agricultural University
基金
新疆教育厅创新项目(XJEDU2017T004)
中国农业大学-新疆农业大学联合基金项目(2015TC051)
关键词
枣园
气象因子
蒸散
叶面积指数
土壤含水率
jujube orchard
meteorological factors
evapotranspiration
leaf area index
soil moisture content
