Hydrologic recovery in forest landscapes

土地利用变化可能对可持续水资源管理构成严重挑战，这反过来又需要关于各种水文成分在受到干扰（水文恢复）后恢复到原始状态所需时间的信息。我提出了一种结合实验模型的方法来研究安大略省南部（加纳拉斯加森林）的一个管理森林景观的水文恢复，该景观位于橡树岭冰碛的顶部，这是该地区的一个关键水文地质特征。我试图了解水文性质和过程在主要土地覆盖之间的差异，并确定它们如何在该地区气候变化的背景下随着水文恢复而变化。森林提供了在相同气候条件下相似土壤和地表地质沉积物上不同类型和年龄的农业用地和林分的马赛克，这有助于研究景观的关键水文成分如何随森林年龄变化（水文恢复的替代指标）。将审查非森林地区和不同类型和年龄的林分的水储存和通量（例如截留、地表径流、补给）。将评估估算补给的替代方法，以确定其潜力，为橡树岭冰碛以及加拿大其他关键地下水补给区提供具有成本效益和空间分布的补给估算。实地项目将提供参数化和测试水渗透、储存和补给模型的数据，这些模型将在不同的气候条件下运行，以检查土地覆盖、气候、地形、土壤和水文地质之间的相互作用，以控制该景观的水文恢复。这项工作将为森林景观的水文恢复提供一个综合的实地和基于模型的研究，解决长期尺度上森林水平衡的所有方面。由此产生的信息和补给估计工具将有助于橡树岭冰碛以及加拿大目前遭受自然和人为影响的其他森林景观的水资源管理。

Land use change can pose serious challenges for sustainable water resource management, which in turn requires information on the time needed for various hydrologic components to return to their original condition after disturbance (hydrologic recovery). I propose a combined experimental-modelling approach to examine hydrologic recovery in a managed forest landscape in southern Ontario (the Ganaraska Forest) on the crest of the Oak Ridges Moraine, a key hydrogeologic feature of the region. I seek to understand how hydrologic properties and processes differ between dominant land covers, and establish how they change with hydrologic recovery in the context of a changing climate in this region. The Forest provides a mosaic of agricultural land and forest stands of differing type and age on similar soils and surficial geologic deposits under the same climate that facilitates the study of how the landscape's key hydrologic components change with forest age (a surrogate of hydrologic recovery). Water storage and fluxes (e.g. interception, surface runoff, recharge) will be examined for non-forested areas and forest stands of differing type and age. Alternative approaches to estimating recharge will be assessed to establish their potential for providing cost-effective and spatially-distributed recharge estimates for the Oak Ridges Moraine as well as other critical groundwater recharge areas in Canada. The field program will provide data to parameterize and test models of water infiltration, storage and recharge that will be run under different climatic conditions to examine interactions between land cover, climate, topography, soils and hydrogeology in controlling hydrologic recovery in this landscape. This work will provide an integrated field and modelling-based study of the hydrologic recovery of forest landscapes that addresses all aspects of the forest water balance over long time scales. The resulting information and recharge estimation tools will assist water resource management on the Oak Ridges Moraine as well as in other forest landscapes in Canada currently experiencing natural and human-induced impacts.