Forest hydrology and biomass modeling: DOC and DON

森林水文和生物量建模：DOC 和 DON

• 批准号: 7803-2007
• 负责人: Arp, Paul
• 金额: $ 1.65万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2009
• 资助国家: 加拿大
• 起止时间: 2009-01-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=420476
• 关键词: Forest; hydrology; biomass; modeling; DOC

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.

本研究提出了一种简化但理论和数值可靠的基于过程的建模方法，以量化高地和湿地的溶解有机碳（DOC）和氮（DON）的产生、释放和运输，受森林凋落物类型、水热地面条件、全年天气和气候变化的影响。这一建议源于我们对最近文献、模型和数据的回顾，以及我们最近对新斯科舍省西南部河流和土壤溶液中DOC、DON和水色的研究。该研究揭示了尚未量化的高原湿地DOC浓度的季节性和逐年对比，高原土壤溶液中的DOC浓度在春季、夏季至秋季、秋末至初冬期间达到峰值。湿地DOC浓度峰值基本一致地出现在夏季至初秋。拟进行的研究包括：1。一项为期5年的努力，为广泛凋落物类型和立地条件的DOC-DON模型生成数据，用于气候影响的森林生物量、碳和养分循环模型。2. 详细的DOC-DON采样研究，并对每个建议采样点（土壤湿度、温度、入渗、渗透、互流等）进行全面的水热评估，受日常天气、森林覆盖和地面覆盖以及土层属性（如深度、容重、质地、有机质和粗粒）的影响。水热预测将通过现场土壤湿度和温度监测和记录进行验证。3. 深入回顾已发表的DOC和DON生产以及高地湿地运输数据和模型，以便进行详细的多模式比较。4. DOC-DON模型的广义应用这需要识别影响doc的流道模式，使用UNB开发的流程来描绘流道和湿区，分辨率为10米或更高。5. 进一步探讨DOC-DON模型在若干研究和环境管理背景下的潜在作用。