土壤水吸力（soil water suction）是土壤基质对水分的吸附和保持能力。是指土壤水的负压力。
随土壤水吸力增大，各处理间差异越明显。
With the increase of soil water suction, the difference among treatments was more obvious.
当土壤水吸力增大到一定值时，中间土层的土壤非饱和导水率反而大于底土层和表土层。
While the soil water suctions increased to some values, the unsaturated hydraulic conductivities in middle soil layers were higher than those in topsoil layers.
影响豌豆叶水势日变化因子中最重要的是大气相对湿度，其次是大气水势、土壤水吸力、大气温度和太阳辐射。
Relative air humidity is the dominant factor for field pea to affect daily dynamics of leaf water potential, followed by air water potential, soil water suction , air temperature and solar radiation.
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