摘要
该文以6年生大田"仕女红"桃树为试验材料,研究了在充分灌溉条件下茎直径最大日收缩量(MDS)的变化规律、MDS与参考作物蒸发蒸散量、太阳净辐射量、水汽压亏缺日均值、正午水汽压亏缺值、气温日均值、正午气温的关系,目的在于建立MDS模拟方程,为现代节水灌溉提供精确决策指标。结果表明:试验期间桃树MDS与各个气象要素具有相似的变化规律,但是各个气象要素对桃树MDS的影响程度不同,经通径分析得出正午气温和太阳净辐射对MDS的直接作用、总作用和决策系数均高于其他气象要素,参考作物蒸发蒸散量、水汽压亏缺日均值、正午水汽压亏缺值、气温日均值通过正午气温和太阳净辐射对MDS起间接作用,所以正午气温和太阳净辐射量是影响MDS最主要的因子。在此基础上建立了MDS模拟方程,用此方程计算的MDS值与实测的MDS值间无显著差异。因此,该方程确定的MDS值可以作为桃树灌溉的参考值,将实测的MDS标准化后可为桃树精确灌溉提供技术支撑。
Field experiment was conducted by measuring the maximum daily shrinkage（MDS） and analyzing the relationships between MDS and reference evapotranspiration（ET0） ,net radiatio（Rs） ,daily mean vapor press deficit（VPDm） ,vapor press deficit at midday（VPDmd） ,daily mean temperature（Tm） and temperature at midday（Tmd） for 6-year-old ＂Shinvhong＂ peach under well irrigation,then MDS simulation equation was established to provide technology for precise irrigation scheduling. The results showed that MDS changed similarly with meteorological factors during the experiment periods;however,meteorological factors had different effects on MDS. By path analysis,the direct and total impacts and the decision correlation of Rs and Tmd were the best,and ET0,VPDm,VPDmd,Tm,showed indirect impacts on MDS by Rs and Tmd. So,Rs and Tmd were the main factors that showed impacts on MDS. Based on this,MDS simulation equation was established. There were no significant differences between calculated MDS using the simulation equation and measured MDS. Therefore,the values of MDS calculated from the equation can be used as reference ones,and the standard values of MDS can provide technical support for precision irrigation of peach.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第3期38-43,共6页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家重大科技支撑项目“陕西半干旱区山地特色果品综合节水技术研究与示范”(2007BAD88B05)
关键词
灌溉
收缩
模型
蒸散
桃树
茎直径最大日收缩量
气象因子
irrigation
shrinkage
models
evapotranspiration
peach
stem diameter maximum daily shrinkage
meteorological factors
作者简介
张平（1984-），女，山东菏泽人，主要从事水资源高效利用方面的研究。杨凌 中国科学院水利部水土保持研究所，712100。Email：sdauzhangping@yahoo.cn
通信作者：汪有科（1956-），男，甘肃人，研究员，主要从事节水灌溉方面的研究。杨凌 西北农林科技大学水土保持研究所，712100。Email：gjzwyk@vip．sina．com
