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研究了4年生酸枣砧梨枣(Ziziphus jujuba Mill.)植株主干茎直径微变化指标对土壤水势(SWP)变化的响应规律,以及与气象要素的关系。结果表明:土壤水势降低引起茎直径日最大收缩量(MDS)增大,日生长量(DG)、生长速率(TGR)和日最大值(MXTD)降低。在水分亏缺发展阶段和水分亏缺维持阶段,MDS和TGR的噪声信号(变异系数)较小,信号强度与噪声信号的比值较大,表明其对土壤水势变化反映敏感。此外,MDS、TGR与潜在蒸散量(ET0)、正午水汽压亏缺(VPDmd)等气象因子的相关性显著,均能反映大气的干旱程度,因此TGR和MDS可作为梨枣水分亏缺的诊断指标。
The response rules of stem diameter variation of four-year-old jujube (Ziziphus jujuba Mill.) To changes of soil water potential (SWP) were studied and their relationships with meteorological factors were studied. The results showed that the decrease of soil water potential caused the increase of maximum daily stem diameter (MDS), the decrease of daily growth (DG), growth rate (TGR) and daily maximum (MXTD). At the stage of water deficit development and water deficit maintenance, the noise signal (coefficient of variation) of MDS and TGR is small, and the ratio of signal intensity to noise signal is large, indicating that they are sensitive to changes of soil water potential. In addition, the correlation between MDS and TGR and meteorological factors such as potential evapotranspiration (ET0) and midday depression (VPDmd) is significant, which can reflect the degree of atmospheric drought. Therefore, TGR and MDS can be used as the diagnosis of water deficit in pear index.