Integrating Ecology and Hydrology with Geomorphology in the Critical Zone: Observations and Numerical Modelling Studies

近年来，我的研究项目主要集中在几个调查尺度上的植被、水文学和景观地貌动力学之间的相互作用，使用基于现场和数值模拟的方法。我的长期研究计划的一个最终目标是扩展我的数值模拟工作(使用我的流域发展模型LandMod来模拟千年时间尺度上的地形变化)，以纳入更全面的生态(植被)和水文成分，以更好地了解与全新世地貌的相互作用。这项建议的依据有四个主要目标：(I)阐明根掷生物扰动在下伏冰川/副冰川沉积的土壤生产和以前冰川地形的沉积物迁移中的作用；(Ii)调查入侵的蚯蚓生物扰动对土壤的物理影响；(Iii)将根抛掷沉积物迁移纳入Landmod，以测试其相对于其他迁移过程的重要性；(Iv)将LandMod与水文学模型结合起来，以了解冰后景观变化与水文学之间的联系。拟议研究的研究地点是加拿大落基山脉的亚高山森林。拟议的研究计划将在几个调查范围内及时提供关于临界区地貌、生物扰动、水文学和成壤作用的知识。这些项目是我过去研究的自然延伸，是实现使用我的数值模型更好地了解地貌、生态和水文相互作用的长期目标的先导，但也代表了我的研究计划推进的新的、具有挑战性的方向。生物扰动研究具有科学和管理意义，因为它解决了亚高山森林中的这些过程，这些森林不同于以前开展了许多关于这一主题的工作的森林。从应用管理的角度来看，入侵蚯蚓项目具有重要意义。数值模拟项目旨在研究地貌、森林生态和/或水文学之间的长期影响和相互作用，使这些潜在的高影响项目有助于前沿的国际研究。

In recent years, my research program has focussed on interactions of vegetation, hydrology, and landscape morphodynamics at several scales of investigation using field-based and numerical modelling approaches. An eventual goal of my longer-term research program is to extend my numerical modelling work (using my drainage basin development model, LandMod, to simulate topographic changes over millennial time scales) to incorporate more comprehensive ecological (vegetation) and hydrological components to better understand interactions with geomorphology over the Holocene. Four primary objectives form the basis of this proposal: (i) elucidating role of root throw bioturbation in soil production of underlying glacial/paraglacial deposits and sediment transport in previously glaciated terrain; (ii) investigating physical impacts on soils of invasive earthworm bioturbation; (iii) integrating root throw sediment transport into Landmod, to test its significance relative to other transport processes; (iv) coupling LandMod with a hydrological model to understand linkages between postglacial landscape changes and hydrology. The study location for the proposed research is subalpine forests, Canadian Rockies. The proposed research program will contribute timely knowledge about geomorphology, bioturbation, hydrology and pedogenesis in the Critical Zone at several scales of inquiry. The projects are natural extensions of my past research and are precursors to reaching the long-term goal of using my numerical model to better understand geomorphic, ecological and hydrological interactions, yet also represent novel, challenging directions for advancement of my research program. The bioturbation research is of scientific and management significance as it tackles these processes in subalpine forests that differ from forests where much previous work on the topic has been undertaken. The invasive earthworm project is of significance from an applied management perspective. The numerical modelling projects are designed to examine longer-term impacts and interactions amongst geomorphology, forest ecology and/or hydrology, making these potentially high impact projects that will contribute to cutting-edge international research.