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首页> 外文期刊>Zeitschrift fur Bewasserungswirtschaft >Water Allocation to Citrus Trees Based on Age and Stem Collar Circumference for Trickle Irrigation Systems
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Water Allocation to Citrus Trees Based on Age and Stem Collar Circumference for Trickle Irrigation Systems

机译：基于年龄和茎颈围的Tri水灌溉系统对柑橘树的水分配

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摘要

Percentage of shaded area is a criterion used in estimating plant water demand used in trickle irrigation system. Accuracy in determining this parameter will, therefore, lead to accuracy in irrigation planning. The present study was conducted to determine the correlations between shaded area and water demand in citrus trees using the tree characteristics of age and stem collar circumference. For this purposes, 53 citrus orchards located in the eastern pail of Mazandaran Province in northern Iran wereselected. In each orchard, an average number of 20 trees with age ranges of 1 to 15 years were selected for measurements. In addition to the stem collar circumference, the shaded area of each tree was determined using the triangulation method and the actual discharge system was measured over three irrigation period in peak consumption months. Based on the measurements, the best relationships among tree shaded area, stem collar circumference, and tree age were developed. The relationships between waterdemand and tree age and stem collar circumference, for common plant spacing practices and the local soils, were also extracted. Evaluation of the proposed relationships was accomplished by comparing water demand estimations for each tree age obtained from these relations with both the reported values by designers and actual dripper discharge measurements. The results showed that the water demand by trees under the age of 8 years is far lower then the current operating conditions or the design conditionswhile the water demand by trees older than 12 is far higher. For trees of 1 and 15 years old, the differences were estimated at 2% and 142%, respectively, as compared to the current operating conditions and at 2% and 115% compared to design recommendations for the local orchards.
机译：阴影面积百分比是估算滴灌系统中植物需水量的标准。因此，确定该参数的准确性将导致灌溉计划的准确性。进行本研究以利用年龄和茎颈围的树木特征来确定柑橘树的阴影面积与需水量之间的相关性。为此，选择了位于伊朗北部Mazandaran省东部桶的53个柑桔园。在每个果园中，平均选择了20棵年龄范围为1至15岁的树木进行测量。除了茎颈围，还使用三角测量法确定了每棵树的阴影区域，并在消耗高峰期的三个灌溉期内测量了实际的排水系统。基于这些测量，开发了树木阴影区域，茎环周长和树木年龄之间的最佳关系。还提取了常见植物间距做法和当地土壤的需水量与树木年龄和茎颈周长之间的关系。通过将从这些关系获得的每个树木年龄的需水量估算值与设计者报告的值和实际滴头流量测量值进行比较，可以完成对建议关系的评估。结果表明，年龄在8岁以下的树木的需水量远低于当前的运行条件或设计条件，而年龄在12岁以上的树木的需水量则远高于当前的运行条件或设计条件。对于1岁和15岁的树木，与当前的操作条件相比，差异估计分别为2％和142％，与当地果园的设计建议相比，差异估计为2％和115％。

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