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植被、水文和景观形态动力学的相互作用，在几个调查尺度上使用基于现场和数值模拟的方法。我长期研究计划的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，以更好地理解全新世与地貌的相互作用。四个主要目标构成了这一建议的基础：(i)阐明根抛生物扰动在冰川/副冰川沉积物的土壤生产和以前冰川地形的沉积物运输中的作用；（ii）研究入侵蚯蚓生物扰动对土壤的物理影响；（iii）将根抛输沙纳入Landmod，检验其相对于其他输沙过程的重要性；（iv）将LandMod与水文模型耦合，以了解冰川后景观变化与水文之间的联系。研究地点为加拿大落基山脉的亚高山森林。提出的研究计划将在几个调查尺度上及时提供关于关键地带的地貌、生物扰动、水文和土壤形成的知识。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理解地貌、生态和水文相互作用的长期目标的先驱，同时也代表了我研究计划的新颖、具有挑战性的发展方向。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，这些过程不同于以前就该主题进行过大量工作的森林。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学、森林生态学和/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尖端的国际研究。

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.