Laser diffraction (LD) is a modern method for determining particle size distribution of soils and sediments. When deciphering particle size distribution, the area under the differential LD-spectrum is determined, limited by the vertical boundaries at the group edges according to the FAO-classification. In fact, there are no real vertical boundaries between the fractions of the particles, and the fractions themselves are distributed on a scale of size according to normal distribution. To eliminate the errors in the fractions content, deconvolution procedure for separating the original particle size distribution LD-spectrum is proposed. It resulted in a different share of the fractions compared to the common calculation method of the fractions content by FAO-classes. It is possible to detect new invisible fractions and, conversely, to exclude fractions defined within FAO vertical boundaries. In addition, the new indicator dispersion of LD-fractions (D) is proposed, which provides information on the property of individual fractions by particle size. Vertisols’ texture was heavier after deconvolution, especially in the Stavropol Vertisols. Vertisols had relatively low dispersion D < 0.7, which means relative homogeneity of LD-fractions. Northern Italy Andosols, however, had lighter texture after deconvolution. The number of LD-fractions was less than the number of FAO-fractions, while clay and fine sand (63–200 μm) LD-fractions were absent. It is likely due to the increase in LD-fractions dispersion, as evidenced by the high value of D (1.5).

中文翻译：

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寻求一种从激光衍射光谱中解码土壤质地的新方法

激光衍射（LD）是一种确定土壤和沉积物粒径分布的现代方法。破译粒度分布时，要确定差分LD谱下的面积，该面积受根据FAO分类的组边缘垂直边界的限制。实际上，在颗粒的各部分之间没有真正的垂直边界，并且这些部分本身根据正态分布按尺寸尺度分布。为了消除馏分含量的误差，提出了分离原始粒径分布LD光谱的反卷积程序。与按粮农组织职类计算的分数含量的通用计算方法相比，分数得到的份额不同。可以检测到新的不可见部分，反之，排除在粮农组织垂直边界内定义的部分。此外，提出了新的LD馏分（D）的指示剂分散体，该分散体提供了有关粒度的各个馏分性质的信息。解卷积后，Vertisols的质地较重，尤其是在Stavropol Vertisols中。藜芦醇的分散度较低D  <0.7，表示LD馏分的相对均一性。但是，意大利北部的Andosols解卷积后质地较轻。LD馏分的数量少于FAO馏分的数量，而没有粘土和细砂（63-200μm）的LD馏分。这可能是由于LD分数色散的增加所致，D值较高（1.5）证明了这一点。