Endogeic earthworms live and burrow in the soil to find their food. They burrow by pushing the soil aside or ingesting it and are thus sensitive to soil compaction. However there is a scarcity of data regarding the effects of soil bulk density on the burrowing behavior and activity of endogeic earthworms. We carried out laboratory experiments using repacked soil cores with various levels of bulk density (from 1.18 to 1.38 g cm⁻³) in which individuals of Aporrectodea caliginosa or Allolobophora chlorotica were incubated for six weeks. The burrow systems inside the soil cores and the compaction around the burrows were then analyzed using X-ray tomography. Soil water infiltration measurements were also carried out. The increase in bulk density had a negative impact on all burrow system characteristics (length, volume, diameter, continuity, number of burrows). When bulk density increased from 1.18 to 1.38 g cm⁻³, volume, diameter, continuity and the number of burrows decreased on average by 77 %, 21 %, 81 % and 58 %, respectively. The increase in density due to compaction around the burrows was similar whatever the species and the bulk density. Increasing soil bulk density from 1.18 to 1.38 g cm^-3 also greatly decreased water infiltration (−89 % for both species) and increased breakthrough time (10 and 25-fold for A. chlorotica and A. caliginosa respectively). However, compared to a control without earthworms, water infiltration in cores incubated with endogeic species was only increased significantly at 1.18 and 1.23 g cm⁻³. This illustrates that burrows made by endogeic earthworms moderately increase water infiltration and only when the soil bulk density is low. Data provided in this study could be used to refine simulation models of earthworm burrowing behavior where burrowing is assumed to be mainly governed by soil water content, temperature and soil bulk density.

内生earth在土壤中生活和觅食以寻找食物。他们通过将土壤推开或吸收来挖洞，因此对土壤压实敏感。但是，缺乏关于土壤容重对内生的穴居行为和活性的影响的数据。我们使用具有不同堆积密度水平（从1.18至1.38 g cm ^-3）的重新包装的土壤核进行了实验室实验，其中，Acalirectodea caliginosa或Alolobophora chlorotica个体孵育六周。然后使用X射线断层摄影术分析土壤核心内部的洞穴系统和洞穴周围的压实度。还进行了土壤水分入渗测量。堆积密度的增加对所有洞穴系统的特征（长度，体积，直径，连续性，洞穴数）都有负面影响。当堆积密度从1.18 g cm ^-3增加到1.38 g cm ^-3时，体积，直径，连续性和洞穴数量分别平均减少77％，21％，81％和58％。不管物种和堆积密度如何，由于在洞穴周围压实而导致的密度增加都是相似的。将土壤容重从1.18增加到1.38 g cm ^-3还大大减少了水的渗透（两种菌种均为-89％）并增加了穿透时间（绿叶曲霉和caliginosa分别为10倍和25倍）。但是，与没有earth的对照相比，与内生菌种一起孵育的岩心中的水渗透仅在1.18和1.23 g cm ^-3时显着增加。这说明只有在土壤容重较低时，由内earth产生的洞穴才适度增加水的渗透。本研究提供的数据可用于完善worm穴行为的模拟模型，假设穴位主要受土壤含水量，温度和土壤容重控制。