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首页> 外文期刊>Plant and Soil >Water accessibility to plant roots in different soil structures occurring in the same soil type.
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Water accessibility to plant roots in different soil structures occurring in the same soil type.

机译：同一土壤类型中不同土壤结构中植物根系的水可及性。

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Different structures within one soil series in the Netherlands were associated with three types of management: conventional temporary grassland (Conv), biodynamic temporary grassland (Bio) and conventional permanent grassland (Perm). Management hadsignificantly altered soil bulk density, organic matter content and porosity. Measured transpiration of barley plants grown in large undisturbed cores from each of the three soil structures showed significant differences, with highest values for Perm followed by Conv and lowest values for Bio. Rooting pattern characteristics, defined as the relation between a series of hypothetical extraction zones around each root and the volumes of excluded soil, were most favourable for Perm, followed by Bio and Conv. The water supply characteristics, defined as the number of days the soil can satisfy a transpiration demand of 5 mm/day as a function of a hypothetical extraction zone, combined with the rooting pattern characteristics, were used to quantify the accessibility of soil water. Accessibility was highest for Perm and Conv with 95% and 94%, respectively, followed by Bio with 68%. When used in a simulation model and compared with simulations implicitly assuming total accessibility, measured transpiration wasbetter simulated by introducing the expression for water accessibility.
机译：荷兰的一个土壤系列中的不同结构与三种管理类型相关：常规临时草地（Conv），生物动力临时草地（Bio）和常规永久草地（Perm）。管理显着改变了土壤容重，有机质含量和孔隙度。从三个土壤结构中的每一个在大的未扰动核心中生长的大麦植物的测得蒸腾量显示出显着差异，彼尔姆的最高值紧随其后的是Conv，最低的生物值。生根模式特征定义为每个根周围的一系列假设提取区与排除的土壤之间的关系，对烫发最有利，其次是生物和转化。供水特征定义为土壤可以满足5 mm / day的蒸腾需求的天数，该天数是假设提取区的函数，并与生根模式特征相结合，用于量化土壤水的可及性。 Perm和Conv的可及性最高，分别为95％和94％，其次是Bio，为68％。当在模拟模型中使用并与隐式假定总可访问性的模拟进行比较时，通过引入水可访问性表达式可以更好地模拟测得的蒸腾作用。

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