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首页> 外文期刊>Acta Horticulturae >Establishing reference values of trunk diameter fluctuations and stem water potential for irrigation scheduling of olive trees.
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Establishing reference values of trunk diameter fluctuations and stem water potential for irrigation scheduling of olive trees.

机译：建立树干直径波动和茎水势的参考值，用于橄榄树的灌溉计划。

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An experiment was conducted during 1999-2002 [location not given] to establish reference values of trunk diameter fluctuations (TDF) and stem water potential (SWP) for irrigation scheduling in well-irrigated 18- and 3-year-old olive (cultivars Picual and Arbequina, respectively) trees. Two different indicators derived from TDF: maximum daily shrinkage (MDS) and trunk growth rate (TGR) were evaluated. The annual relationship between MDS and vapour pressure deficit (VPD) was hysteretic, probably caused by the presence of fruit as no hysteresis was detected in 'off' trees. When the data until mid-August in mature "on" trees was used, the fit was improved (R2=0.71). Young trees had a slightly different relationship with a steeper slope (R2=0.80). The relationships between the SWP values and VPD were not as good as with MDS (R2=~0.3), and the regression slope was steeper in 'on' than in 'off' trees. TGR in the young orchard had two maximums in the year; the first at mid-spring (0.2 mm/day) and the second at the end of the summer (0.15 mm/day). In the mature orchard, TGR had a single maximum value, at the end of summer for 'off' trees, and in spring for 'on' trees.
机译：在1999-2002年间进行了一项实验[未提供位置]，以建立树干直径波动（TDF）和茎水势（SWP）的参考值，以供灌溉良好的18岁和3岁橄榄（栽培品种Picual和Arbequina）。评估了来自TDF的两个不同指标：最大日收缩率（MDS）和躯干生长率（TGR）。 MDS与蒸气压不足（VPD）之间的年度关系具有滞后性，这可能是由于果实的存在所致，因为在“离开”的树木中未检测到滞后。当使用直到8月中旬的成熟“开”树上的数据时，拟合度得到了改善（R2 = 0.71）。幼树与陡坡的关系略有不同（R2 = 0.80）。 SWP值和VPD之间的关系不如MDS（R2 =〜0.3）更好，“开”树的回归斜率比“关”树的回归斜率陡。年幼果园的TGR达到两个最大值。第一个是在春季中期（0.2毫米/天），第二个是在夏季末（0.15毫米/天）。在成熟的果园中，TGR有一个最大值，夏末的“掉”树和春季的“上”树。

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