Soil aggregate water stability is very important from both scientific and practical points of view. This stability is a critical factor in a soil's susceptibility to water erosion and, in turn, land degradation. The most popular measure of soil aggregate stability is the water resistance index (WRI), which is commonly measured using the wet‐sieving method. Using the laser diffraction method in order to observe changes in the median of the particle size distribution and determine soil aggregate stability was first proposed in 2010. However, the method was not suitable for weak aggregates. The aim of this study was to present a measure of aggregate stability using laser diffractometry, aggregate stability index (ASI_LD). Determination of the ASI_LD is based on the calculation of the directional coefficient of the straight line interpolated from 2 points: (a) the value calculated as the mean of the lower and upper nominal sieve sizes used for soil aggregate separation and (b) the median of the first measurement after the adding of the dry aggregates into the measuring system of the laser diffractometer.

中文翻译：

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激光衍射法测定骨料稳定性的一种改进方法

从科学和实践的角度来看，土壤骨料的水稳定性非常重要。这种稳定性是土壤对水蚀和土地退化的敏感性的关键因素。最受欢迎的衡量土壤团聚体稳定性的方法是耐水性指数（WRI），通常使用湿筛法进行测量。为了观察粒径分布中值的变化并确定土壤团聚体的稳定性，于2010年首次提出使用激光衍射法。但是，该方法不适用于弱团聚体。这项研究的目的是提出一种使用激光衍射法测量骨料稳定性的方法，即骨料稳定性指数（ASI _LD）。ASI _LD的确定 基于计算从2个点内插的直线的方向系数：（a）计算为用于土壤骨料分离的上下名义筛尺寸的平均值的值，以及（b）第一次测量的中值将干骨料添加到激光衍射仪的测量系统中之后。