Earthworm activity is a key factor in creating soil aggregates, but introduced organic matter and abiotic factors are also equally important. The purpose of this study was to investigate the stability of aggregates made by earthworms in soils with organic additives. Additionally, the two aggregate stability measurement methods were compared: (i) the wet-sieve method and (ii) the laser diffraction method. A six-month container experiment containing sixteen treatments and controls were made. Each treatment included one of four types of soil texture: sand, loam, silty loam and clay, and one of four additives: straw, peat, compost and compost with added microorganisms. To each treatment, six earthworms were added, two each of species commonly occurring in Polish soils: Dendrodrilus rubidus, Aporrectodea caliginosa and A. rosea. This study confirmed that earthworm activity was the factor favoring aggregate formation. In terms of the investigated organic additives, the efficiency of aggregate creation was as follows: compost with active bacteria, compost, peat and straw. Nevertheless, earthworms alone, without the addition of an organic additive, did not form permanent aggregates. The wet sieving and laser diffractometry methods of measuring aggregate stability were comparable for silty, clayey and loamy soils.

中文翻译：

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Organic在含有机添加剂的土壤中形成骨料的稳定性

activity的活动是形成土壤团聚体的关键因素，但是引入的有机物和非生物因素也同样重要。这项研究的目的是研究earth在含有有机添加剂的土壤中的团聚体的稳定性。另外，比较了两种骨料稳定性测量方法：（i）湿筛法和（ii）激光衍射法。进行了一个为期六个月的容器实验，其中包含十六种处理和对照。每种处理都包括四种土壤质地中的一种：沙子，壤土，粉质壤土和黏土，以及四种添加剂之一：稻草，泥炭，堆肥和添加了微生物的堆肥。在每种处理方法中，添加了六只earth，波兰土壤中常见的两种物种分别是：Dendrodrilus rubidus，Acalirectodea caliginosa和A. rosea。这项研究证实earth活性是促进聚集体形成的因素。就所研究的有机添加剂而言，聚集体产生的效率如下：活性细菌堆肥，堆肥，泥炭和稻草。然而，仅alone在不添加有机添加剂的情况下不会形成永久聚集体。用于测量骨料稳定性的湿筛和激光衍射法可用于粉质，黏土和壤土。