In this study, we developed two new depth-decaying and depth-cumulative models for root length density and root mass density of winter barley. The performance of the new models was compared with the several existing depth-decaying and depth-cumulative root distribution models. The experimental treatments were the combinations of full, deficit, and rainfed irrigations under the raised bed and conventional flat planting systems. The two new models showed good performance in comparison with the other existing models. Further analysis based on the cumulative specific root length approach revealed that full irrigation resulted in thicker and thinner roots in the shallow soil depths of the raised bed and flat planting systems, respectively. In contrast, under deficit and rainfed irrigations, thinner and thicker roots were respectively developed in the shallow soil depths of the raised bed and flat planting system. This shows that under suboptimal soil water content, the crops in the raised bed planting system might be able to seek water by developing a network of thin and long roots in the soil matrix.

在这项研究中，我们针对冬two的根长密度和根质量密度开发了两个新的深度衰减和深度累积模型。将新模型的性能与几个现有的深度衰减和深度累积根分布模型进行了比较。试验处理是在高架床和常规平地种植系统下进行全量灌溉，亏缺灌溉和雨水灌溉。与其他现有模型相比，这两个新模型表现出良好的性能。根据累积比根长法进行的进一步分析表明，全面灌溉导致高架床和平坦种植系统的浅层土壤根系分别较粗和较细。相反，在赤字和雨水灌溉下，在高架床和平整种植系统的浅层土壤中分别形成了较细和较粗的根。这表明在土壤水含量不理想的情况下，高架床种植系统中的作物可能能够通过在土壤基质中形成细而长的根系网络来寻求水分。