Knowledge of water absorbed by caliche nodules is important for accurate soil water estimation. Simulated soil column experiments are used to investigate the effects of caliche nodules on soil profile water distribution and soil water estimation under given water supply conditions. The results indicate that for the treatments with five caliche nodules contents (CNC = 0, 10, 20, 30, and 40%), except for the top 0–0.1 m soil layer, the soil water content (SWC) of other layers is significantly different between the treatments (P < 0.05). The SWC is positively correlated to CNC. There are significant differences (P < 0.05) in caliche nodule water content (CWC) in the top three soil layers for all treatments. For soils with less than 10% caliche nodules, the soil water storage (SWS) in deeper soil layer (0.3–0.4 m) is significantly higher than that in surface soil layers (P < 0.05). Caliche nodule water storage (CWS) and available caliche nodule water storage (ACWS) both increase with increasing CNC. Water storage in the caliche nodules increases with the increase in CNC. There are significant differences in ACWS among soil layers in all soils (P < 0.05). The total ACWS significantly increases with the increase in CNC (P < 0.01). If water is absorbed by caliche nodules, then the total water storage of soils with CNCs of 10, 20, 30, and 40% would be underestimated by 3, 8, 10, and 17%, respectively. This study contributes to accurate soil water estimation in soils with caliche nodules and provide a scientific basis for rational utilization of soil and water resources.

中文翻译：

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黄土高原北部结瘤结节对土壤贮水的影响。

了解钙结瘤吸收的水分对于准确估算土壤水分很重要。在给定的供水条件下，使用模拟的土壤柱实验研究钙结节对土壤剖面水分布和土壤水分估算的影响。结果表明，对于有五个葫芦根瘤含量（CNC = 0、10、20、30和40％）的处理，除了最顶层的0–0.1 m土层外，其他层的土壤水分（SWC）为两种治疗之间有显着差异（P  <0.05）。SWC与CNC正相关。有显着差异（P 所有处理的前三层土壤钙结节水含量（<0.05）。对于钙结节少于10％的土壤，深层土壤（0.3-0.4 m）的土壤水储量（SWS）明显高于表层土壤（P  <0.05）。壶形结节水存储（CWS）和可用壶形结节水存储（ACWS）都随着CNC的增加而增加。杯状结节中的水存储量随着CNC的增加而增加。在所有土壤中，不同土壤层之间的ACWS有显着差异（P  <0.05）。随着CNC的增加，总ACWS显着增加（P <0.01）。如果水被钙结瘤吸收，那么CNC值为10％，20％，30％和40％的土壤的总储水量将分别低估3％，8％，10％和17％。这项研究有助于精确计算带有钙结节土壤的土壤水分，并为合​​理利用土壤和水资源提供科学依据。