Hemp (Cannabis sativa L.) is a high-yielding multi-purpose crop, but its hydrological functioning is poorly understood. Studies on the interception processes in hemp have been lacking so far. This study contributes to the understanding of the influences of evaporation of intercepted water and other hydrological fluxes within plants of two cultivars, “Santhica 27” and “Ivory”, on the water productivity. To determine water productivity and evaporation from interception, field measurements were conducted on plants of both cultivars at different stages of development. Precipitation (P), throughfall (TF), transpiration (T), and volumetric water content (VWC) were measured along with leaf area index (LAI) and yield of selected plant components. For the entire vegetation period, the cumulative P of 44 mm was converted into 13 mm TF (30%). The inferred evaporation of intercepted water (I) was high at 31 mm (71%). For the assessment water fluxes, the evaporation of intercepted water must be considered in the decision-making process. Besides the LAI, the plant architecture and the meteorological conditions during the cropping cycle seem to be the main factors determining I in the case of plants of both cultivars. Water productivity (WPDM) of the whole plant varied between 3.07 kg m−3 for Ivory and 3.49 for Santhica 27. In the case of bast yield, WPDM was 0.39 kg m-3 for Santhica 27 and 0.45 kg m−3 for Ivory. After the propagation of the uncertainties, the bandwidth of the WPDM of the whole plant was between 0.42 kg m−3 and 2.57 kg m−3. For bast fiber a bandwidth of the WP between 0.06 kg m−3 and 0.33 kg m−3 was calculated. The results show furthermore that even with a precise examination of water productivity, a high bandwidth of local values is revealed on different cultivars. However, generic WP values for fiber crops are not attainable.

中文翻译：

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2018年勃兰登堡（德国）干热条件下工业大麻产水率研究

大麻 (Cannabis sativa L.) 是一种高产的多用途作物，但对其水文功能知之甚少。迄今为止，缺乏对大麻拦截过程的研究。本研究有助于了解“Santhica 27”和“Ivory”两个品种植物内截留水分蒸发和其他水文通量对水分生产力的影响。为了确定截留的水分生产力和蒸发量，对处于不同发育阶段的两个栽培品种的植物进行了实地测量。与叶面积指数 (LAI) 和选定植物成分的产量一起测量降水 (P)、穿透量 (TF)、蒸腾作用 (T) 和体积含水量 (VWC)。对于整个植被时期，44 mm 的累积 P 转换为 13 mm TF (30%)。截留水 (I) 的推断蒸发量高达 31 毫米 (71%)。对于评估水通量，在决策过程中必须考虑截留水的蒸发。除了 LAI，种植周期中的植物结构和气象条件似乎是决定两个品种植物 I 的主要因素。整个植物的水分生产率（WPDM）在象牙的 3.07 kg m-3 和 Santhica 27 的 3.49 之间变化。在韧皮产量的情况下，WPDM 为 Santhica 27 的 0.39 kg m-3 和象牙的 0.45 kg m-3。不确定性传播后，全厂WPDM的带宽在0.42 kg m-3和2.57 kg m-3之间。对于韧皮纤维，计算了 0.06 kg m-3 和 0.33 kg m-3 之间的 WP 带宽。结果进一步表明，即使对水资源生产力进行了精确的检查，不同品种的当地价值也表现出很高的带宽。然而，无法获得纤维作物的通用 WP 值。