枣树茎直径日最大收缩量影响因子分析

选取4年生梨枣树(Zizyphus jujuba Mill.),设置4个土壤水分梯度,研究不同水分条件下梨枣树不同生育期茎直径日最大收缩量(DMDS)变化规律,确定DMDS与土壤水分及气象因子(参考作物蒸发蒸散量E、水汽压亏缺日均值V)的关系。结果表明:1)土壤水分条件影响梨枣树DMDS对气象变化的敏感度,水分适宜处理梨枣树DMDS对气象变化最为敏感,其余水分处理梨枣树DMDS的变化规律与其一致,但波动幅度较小;2)不同生育期DMDS与气象因子关系存在差异,果实膨大期、果实成熟期与E、V关系均极显著,萌芽展叶期与开花坐果期相关系数较小;3)不同水分处理梨枣不同生育期DMDS与气象因子关系不同,高水分处理(T1)开花坐果期DMDS与V关系显著,与E极显著,其他处理均不显著;4)在不同水分条件下,梨枣全生育期内参考作物蒸发蒸散量E是影响茎直径日最大收缩量的关键因素。

Impact factors analyses of Zizyphus jujuba Mill. trunk on daily maximum shrinkage

To explore the relationship between Zizyphus jujuba Mill. trunk daily maximum shrinkage （DMDs） and meteorological factors under different soil water status, we performed an experiments with 4 year-old Zizyphus jujuba Mill. under four-level soil moisture treatments. The results demonstrated that ： 1 ） Soil water condition mainly had influence on the sensitivity of DMDs response to meteorological factors. The suitable water treatment was the most sensitive to meteorological factors, while other treatments presented similar dynamics and narrow fluctuation range. 2） DMDS showed varied relationship with meteorological factors over growth stages. The difference between DMDs and E, V was very significant in fruit expansion and ripening stages, which was not significant during leaf expansion and flowing and fruit set stages. 3） The relationship between DMDSand meteorological factors were different under different water treatment during different growth stages. DMDs and V had significant relationship, DMDs and E had very significantrelationship under higher water treatment, but others was not significant. 4） E was the key factor on influence trunk maximum daily shrinkage for Zizyphus jujuba Mill. which under different water conditions during all growth stages.