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首页> 外文期刊>Agricultural Water Management >Usefulness of trunk diameter variations as continuous water stress indicators of pomegranate (Punica granatum) trees.
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Usefulness of trunk diameter variations as continuous water stress indicators of pomegranate (Punica granatum) trees.

机译：树干直径变化作为石榴（ Punica granatum ）树的连续水分胁迫指标的有用性。

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Pomegranate trees (Punica granatum L.) is a deciduous fruit tree included in the so-called group of minor fruit tree species, not widely grown but of some importance in the south east of Spain. Pomegranate trees are considered as a culture tolerant to soil water deficit. However, very little is known about pomegranate orchard water management. The objective of this research was to asses the feasibility of using trunk diameter variation (TDV) indexes, obtained by means of LVDT sensors, as a plant water stress indicators for pomegranate trees. The experiment was carried out with mature trees grown in the field under three irrigation regimes: control well watered trees; trees continuously deficit irrigated at 50% of the control regime (SDI); and trees that had a summer water stress cycle being irrigated at 25% of the control rates only in July and August (RDI). The seasonal variations of maximum diurnal trunk shrinkage (MDS) and trunk growth rates (TGR) were compared with midday stem water potential ( Psi stem) measurements. During the course of the entire season, control trees maintained lower MDS values than the SDI ones. In the RDI treatment, as water restrictions began, there was a slow increase in MDS, in correspondence with a decrease in Psi stem. When water was returned at full dosage, the RDI quickly recovered to MDS and Psi stem values similar to the control. However, lower MDS for a given Psi stem values were observed as the season advanced. The magnitude of differences between well watered and deficit irrigated trees was much larger in the case of MDS than for Psi stem. However, the tree-to-tree variability of the MDS readings was more than four times higher than for Psi stem; average coefficient of variation of 7.5 and 36% for Psi stem and MDS, respectively. On the other hand, TGR did not clearly reflect differences in tree water status. Overall, results reported indicated that MDS is a good indicator of pomegranate tree water status and it can be further used for managing irrigation. However, the seasonal changes in the MDS- Psi stem relationship should be taken into account when attempting to use threshold MDS values for scheduling irrigation.
机译：石榴树（Punica granatum L.）是一种落叶果树，被包括在所谓的次要果树种群中，虽然没有广泛种植，但在西班牙的东南部具有重要意义。石榴树被认为是可以耐受土壤缺水的文化。但是，对石榴园水管理的了解很少。这项研究的目的是评估使用通过LVDT传感器获得的树干直径变化（TDV）指标作为石榴树植物水分胁迫指标的可行性。实验是在田间生长的成熟树木在三种灌溉方式下进行的：控制灌溉良好的树木;树木持续亏缺灌溉量为控制制度（SDI）的50％;仅在7月和8月（RDI）灌溉夏季水分胁迫周期的树木，其灌溉率为控制率的25％。将最大日间树干收缩量（MDS）和树干生长速率（TGR）的季节性变化与午间茎水势（Psi茎）进行比较。在整个季节中，对照树的MDS值低于SDI树。在RDI处理中，随着水限制的开始，MDS缓慢增加，而Psi茎减少。当以全剂量返水时，RDI迅速恢复至MDS和Psi茎值，与对照组相似。但是，随着季节的发展，对于给定的Psi茎值，观察到较低的MDS。在MDS的情况下，灌溉良好的树木和缺水灌溉的树木之间的差异比Psi茎大得多。但是，MDS读数的树到树变异性是Psi茎的四倍以上; Psi茎和MDS的平均变异系数分别为7.5和36％。另一方面，TGR不能清楚地反映出树木水状况的差异。总体而言，报告的结果表明MDS是石榴树水状况的良好指标，可以进一步用于管理灌溉。但是，在尝试使用阈值MDS值来计划灌溉时，应考虑MDS-Psi茎关系的季节性变化。

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