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: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=474283
• 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.

这项研究推进了一种简化的理论和数值强大的基于过程的建模方法，以量化来自高地和湿地的溶解有机碳（DOC）和氮（DON）的生产，释放和运输，受森林垃圾类型的影响地面条件和全年天气以及气候变化。该提案源于我们对新文献，模型和数据的综述，以及我们最近在新斯科舍省西南部的溪流和土壤解决方案中对DOC，DON和水色的研究。这项研究表明，高地 - 韦兰DOC的浓度尚未得到尚未量化的季节性和逐年对比，在春季或夏季或夏季或秋季秋天至冬季，在高地土壤解决方案中达到顶峰。湿地文档的浓度在夏季至秋季初始终如一。拟议的研究涉及：1。为期5年的努力，以生成用于多种垃圾类型和现场条件的DOC-DON建模的数据，以在受气候影响的森林生物量，C和营养循环建模中使用。 2。一项详细的DOC-DON抽样研究，伴随着针对每个提议的采样地点（土壤水分，温度，浸润，渗透，相互流动等）进行全面的水力热评估地面覆盖物和土壤层属性，例如深度，散装密度，质地，有机物和粗片段。水力 - 热预测将通过原位土壤水分以及温度监测和记录来验证。 3。对已发表的DOC和DON Production和Upland-Wetland Transport Data and Models进行了深入的评论，以进行详细的多模型比较。 4。由此产生的DOC-DON模型的广义应用；这就需要使用UNC开发的过程来辨别出DOC的流道模式，以10 m分辨率或更高的分辨率来描述流动路径和湿区。 5。进一步探索所得DOC-DON模型在几种研究和环境管理环境中的潜在作用。