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首页> 外文期刊>Irrigation Science >Evaluating water stress in irrigated olives: correlation of soil water status, tree water status, and thermal imagery.
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Evaluating water stress in irrigated olives: correlation of soil water status, tree water status, and thermal imagery.

机译：评估灌溉橄榄中的水分胁迫：土壤水分状况，树木水分状况和热图像的相关性。

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摘要

Irrigation of olive orchards is challenged to optimize both yields and oil quality. Best management practices for olive irrigation will likely depend on the ability to maintain mild to moderate levels of water stress during at least some parts of the growing season. We examined a number of soil, plant and remote sensing parameters for evaluating water stress in bearing olive (var. Barnea) trees in Israel. The trees were irrigated with five water application treatments (30, 50, 75, 100 and 125% of potential evapotranspiration) and the measurements of soil water content and potential, mid-day stem water potential, and stomatal resistance were taken. Remote thermal images of individual trees were used to alternatively measure average canopy temperature and to calculate the tree's crop water stress index (CWSI), testing empirical and analytical approaches. A strong non-linear response showing similar trends and behavior was evident in soil and plant water status measurements as well as in the CWSI, with decreasing rates of change at the higher irrigation application levels. No statistically significant difference was found between the analytical and the empirical CWSI, suggesting that the relative simplicity of the analytical method would make it preferable in practical applications.
机译：橄榄园的灌溉面临挑战，以优化产量和油质。橄榄灌溉的最佳管理方法可能取决于在生长季节的至少某些时期保持轻度至中度水胁迫的能力。我们检查了许多土壤，植物和遥感参数，以评估以色列的橄榄树（巴尼娅种）的水分胁迫。用五种水分处理（分别为潜在蒸散量的30％，50％，75％，100％和125％）灌溉树木，并测量土壤含水量和潜力，日中茎水势和气孔阻力。使用个别树木的远程热图像来替代地测量平均冠层温度并计算树木的作物水分胁迫指数（CWSI），并测试经验和分析方法。在土壤和植物水状况测量以及CWSI中，强烈的非线性响应显示出相似的趋势和行为，在较高的灌溉水平下，变化率降低。在分析的和经验的CWSI之间没有发现统计学上的显着差异，这表明分析方法的相对简单性使其在实际应用中更为可取。

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