Forest hydrology and biomass modeling: DOC and DON

本研究提出了一种简化但理论上和数值上稳健的基于过程的建模方法，以量化旱地和湿地溶解有机碳（DOC）和氮（DON）的生产，释放和运输，受森林凋落物类型，水热地面条件和每日全年天气和气候变化的影响。这一建议源于我们最近的文献，模型和数据的审查，我们最近的研究DOC，DON和水色在西南部新斯科舍省的溪流和土壤溶液。这项研究揭示了尚未量化的季节性和逐年的对比，在旱地湿地DOC浓度，在春季，或夏季到秋季，或晚秋初冬在高地土壤溶液中达到峰值。湿地DOC浓度在夏季至初秋达到相当一致的峰值。研究内容包括：1.一个5年的努力，以产生数据的DOC-DON建模为广泛的凋落物类型和立地条件，将用于气候影响的森林生物量，碳和养分循环建模。2.详细的DOC-DON取样研究，以及对每个拟议取样点的综合水热评估（土壤湿度、温度、渗透、渗滤、互流等），受日常天气、森林覆盖和地面覆盖以及土层属性（如深度、体积密度、质地、有机物和粗碎屑）的影响。将通过现场土壤湿度和温度监测和记录来核实水热预测。3.对已发表的DOC和DON生产和高地湿地传输数据和模型进行深入审查，以便进行详细的多模型比较。4.由此产生的DOC-DON模型的一般化应用;这需要辨别DOC影响流路模式，使用UNB开发的过程来描绘流路和湿区，分辨率为10 m或更高。5.进一步探索由此产生的DOC-DON模型在几个研究和环境管理方面的潜在作用。

This research advances a simplified yet theoretically and numerically robust process-based modeling approach to quantify the production, release and transport of dissolved organic carbon (DOC) and nitrogen (DON) from uplands and wetlands, as affected by forest litter type, hydro-thermal ground conditions, and daily year-round weather, and climate change. This proposal originates from our review of recent literature, models and data, and our recent study on DOC, DON and water colour in streams and soil solutions in south-western Nova Scotia. This study revealed as-yet un-quantified seasonal and year-by-year contrasts in upland-wetland DOC concentrations, which peak in upland soil solutions during spring, or summer to fall, or late fall to early winter. Wetland DOC concentrations peak fairly consistently in summer to early fall. The proposed research involves: 1. A 5-year effort, to generate data for DOC-DON modeling for a wide range of litter types and site conditions, to be of use in climate-affected forest biomass, C, and nutrient cycling modeling. 2. A detailed DOC-DON sampling study, accompanied with a comprehensive hydro-thermal assessment for each of the proposed sampling sites (soil moisture, temperature, infiltration, percolation, interflow, etc.), as affected by daily weather, forest cover and ground-cover , and soil-layer attributes such as depth, bulk density, texture, organic matter and coarse fragments. Hydro-thermal projections will be verified by in-situ soil moisture and temperature monitoring and recording. 3. An in-depth review of published DOC and DON production and upland-wetland transport data and models, to allow for a detailed multi-model comparison. 4. A generalized application of the resulting DOC-DON model; this requires the discerning of DOC-affecting flow-path patterns, using the UNB developed process to delineate flow paths and wet-areas, at 10 m resolution or better. 5. Further exploring potential roles of the resulting DOC-DON model in several research and environmental management contexts.