Effective precipitation plays an important role in crop growth, and subsoiling may have an impact on the effective precipitation of farmland. The question how subsoiling influences effective precipitations has prompted this research. The major objective of this study was to quantify the effect of subsoiling on effective precipitation of farmland. The main soil type in the study area is loam. Six scenarios were set with three factors, namely, the thickness of the soil ploughing layer, porosity, and soil permeability. The hydrological process from 2000 to 2015 was simulated with a distributed hydrological model. The results showed that a 10-cm increase in the soil thickness of the plough layer had little effect on the effective precipitation. When soil porosity increased by 0.1, the effective precipitation increased by approximately 19%. When the soil permeability coefficient increased by 0.5 times, the farmland and watershed surface runoff decreased by 24% and 13%, respectively, and the effective precipitation increased by 1.7%. This study proves that subsoiling has a positive effect on the local effective precipitation and confirms previous hypotheses.

中文翻译：

---

基于分布式水文模型的深松对农田有效降水的影响

有效降水对作物生长起着重要作用，深松可能会影响农田的有效降水。下沉如何影响有效降水的问题促使了这项研究。本研究的主要目的是量化深松对农田有效降水的影响。研究区主要土壤类型为壤土。土壤耕作层厚度、孔隙度和土壤渗透性三个因素设置了六个场景。2000—2015年水文过程采用分布式水文模型模拟。结果表明，耕层土壤厚度每增加10cm，对有效降水影响不大。当土壤孔隙度增加 0.1 时，有效降水量增加约 19%。当土壤渗透系数增加0.5倍时，农田和流域地表径流分别减少24%和13%，有效降水增加1.7%。这项研究证明了深松对当地有效降水有积极影响，并证实了之前的假设。