As in many other soil science disciplines, in soil physics and hydrology, we have arrived at a point where substantial gains in knowledge depend to a large extent on reaching out to related disciplines. The purpose of this special section on “Transdisciplinary Contributions and Opportunities in Soil Physical Hydrology” is to honor Professor Emeritus Jan W. Hopmans, University of California Davis, CA, as one of the pioneers in transdisciplinary research. In this introduction, the 12 articles collected for this special section are summarized, and their relationship to Hopmans’ work during his productive career is emphasized. The contributions reflect the depth and width of soil physics and hydrology and are aimed to stimulate transdisciplinary science to meet the existing challenges in agriculture and the environment.

中文翻译：

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土壤物理水文学的跨学科贡献和机遇

就像在许多其他土壤科学学科中一样，在土壤物理学和水文学中，我们已经到达了一个点，即知识的大量获取在很大程度上取决于与相关学科的联系。本节“土壤物理水文学中的跨学科贡献和机遇”的特殊部分旨在表彰加利福尼亚大学戴维斯分校的名誉教授扬·W·霍普曼斯教授为跨学科研究的先驱之一。在本导言中，总结了本节收集的12篇文章，并强调了它们与霍普曼斯在其职业生涯中的工作之间的关系。这些贡献反映了土壤物理学和水文学的深度和广度，旨在激发跨学科科学来应对农业和环境方面的现有挑战。