The assumption that microlysimeters (MLs) adequately reflect the soil conditions is widespread. Nevertheless, previous findings raised doubts regarding the reliability of MLs to adequately reflect the amounts of dew and fog of the intact soil (control, COT). We therefore hypothesized that the structure (whether a single cylinder inserted into the soil (ML-I), or a cylinder inserted within a large-diameter cylinder thus mimicking a weighing ML (ML-II)), the construction material (PVC and metal, i.e., iron), length (12, 50 cm) and height above ground (12, 30 cm), all will largely affect the thermal regime of the ML. A set of experiments were conducted during which the ML temperatures (1, 5 cm and more) and the dew and fog (using cloths attached to 10 × 10 × 0.2 glass plates located on the MLs) were measured. The findings indicate that (a) in comparison to COT, the minimum temperatures substantially decreased (by 2.0–2.5 °C) and dew and fog substantially increased (by a factor of 3.2–3.5) with height above ground (b) ML_PVC-I and both types of MLs-II yielded higher dew and fog than COT, especially ML_PVC-II, which yielded 2.1-fold higher amounts of dew and fog than COT (c) except for ML_metal-I that yielded similar temperatures and dew and fog to COT, all the remaining MLs exhibited lower nocturnal temperatures and higher dew and fog than COT. The higher amounts of dew and fog recorded by the MLs are explained by changes in the heat regime induced by the structure of the ML. The findings raise doubts on recent attempts to deduce the magnitude of vapor flux (dewrise, distillation) based on dew and fog measurements with MLs, and call for extra caution once arid ecosystem productivity is analyzed and predicted following ML-based dew and fog values.

微渗析仪 (ML) 充分反映土壤条件的假设很普遍。然而，先前的研究结果对 ML 是否能够充分反映完整土壤（对照，COT）的露水和雾量的可靠性提出了质疑。因此，我们假设结构（无论是插入土壤中的单个圆柱体 (ML-I)，还是插入大直径圆柱体从而模拟称重 ML (ML-II)）、建筑材料（PVC 和金属，即铁）、长度（12, 50 cm）和离地高度（12, 30 cm），都将在很大程度上影响 ML 的热状态。进行了一组实验，在此期间测量了 ML 温度（1、5 厘米和更高）以及露水和雾气（使用附着在 ML 上的 10 × 10 × 0.2 玻璃板上的布）。_PVC -I 和两种类型的 MLs-II 产生比 COT 更高的露水和雾气，尤其是 ML _PVC -II，其产生的露水和雾气量是 COT (c) 的 2.1 倍，除了产生相似温度的ML_金属-I从露水和雾气到 COT，所有剩余的 ML 都表现出比 COT 更低的夜间温度和更高的露水和雾气。ML 记录的大量露水和雾是由 ML 结构引起的热状态变化来解释的。这些发现对最近基于露水和雾测量和 ML 推断蒸汽通量（露水、蒸馏）的大小的尝试提出了质疑，并呼吁在根据基于 ML 的露水和雾值分析和预测干旱生态系统生产力时格外小心。