"Carbon and water balances of hybrid poplar plantations, and lodgepole pine and Douglas-fir stands"

“混合杨树种植园、黑松和花旗松林的碳和水平衡”

• 批准号: 6123-2012
• 负责人: Black, Andrew
• 金额: $ 2.77万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=568446
• 关键词: Carbon; water; balances; hybrid; poplar

The goal of my research is to better understand the carbon (C), water and energy balances of hybrid poplar (HP) plantations, lodgepole pine stands recovering from mountain pine beetle (MPB) attack, and managed coastal Douglas-fir (DF) stands. A micrometeorological method, eddy covariance (EC), will be used to make year-round measurements of net ecosystem productivity (i.e., C sequestration or loss) and evapotranspiration (i.e., water use). One aim of my HP research is to determine the capacity of different-aged HP plantations in the Prairie region to sequester C as plant biomass (for fibre or bioenergy production) and soil organic matter. Because of the high water requirements of HP plantations, a key objective will be to determine the sustainability of extensive plantations by comparing water use and precipitation. Effects on the rate of water drainage to the water table will be determined and the implications for the regional water balance assessed. In my MPB research, an important objective is to measure the rate of recovery of the C balance in non-harvested stands when killed trees are starting to fall with the possibility of increasing decomposition rates. In addition, the feasibility of using partial salvage harvesting (removing only pine trees) rather than clearcut salvage harvesting (which results in large C losses) will be determined by assessing wind damage and C sequestration in the former. A process-based forest production model (3PG) will be used with several management scenarios to estimate likely near-future changes in the C balance in the vicinity of our MPB research sites. My DF research will focus on measuring the strong growth response of a 23-year-old stand fertilized in 2007 as it begins to crowd out competing understory vegetation. In addition, the losses of C from a clearcut resulting from the harvesting (in Jan 2011) of a recently-fertilized 61-year-old stand will be measured using EC until 2013. Controlling processes will be studied using measurements of respiration by soil and woody harvesting debris, soil-surface methane and nitrous oxide fluxes, rates of C transport in stream water, and post-harvesting changes in the soil water regime.

我的研究的目标是更好地了解碳（C），水和能量平衡的杂交白杨（HP）人工林，从山松甲虫（MPB）攻击恢复的黑松林，并管理沿海花旗松（DF）的立场。一种微气象学方法，涡度协方差（EC），将用于全年测量净生态系统生产力（即，C螯合或损失）和蒸散（即，用水）。我的HP研究的一个目的是确定草原地区不同年龄的HP种植园将C作为植物生物量（用于纤维或生物能源生产）和土壤有机质隔离的能力。由于HP人工林对水的要求很高，因此一个关键目标是通过比较用水量和降水量来确定大面积人工林的可持续性。将确定对地下水位排水率的影响，并评估对区域水平衡的影响。在我的MPB研究中，一个重要的目标是测量未采伐林分中C平衡的恢复率，当被杀死的树木开始下降时，分解率可能会增加。此外，使用部分抢救性采伐（只删除松树），而不是皆伐抢救性采伐（这会导致大量的碳损失）的可行性将通过评估风的损害和碳封存在前者。一个基于过程的森林生产模型（3PG）将与几个管理方案，以估计可能在不久的将来在我们的MPB研究地点附近的C平衡的变化。我的DF研究将集中在测量2007年施肥的23岁的立场，因为它开始排挤竞争林下植被的强烈增长反应。此外，C的损失，从一个皆伐产生的收获（2011年1月）最近施肥的61岁的立场将使用EC测量，直到2013年。控制过程将进行研究，使用测量呼吸土壤和木质收获残体，土壤表面甲烷和一氧化二氮通量，C运输率在溪流中，和收获后的土壤水分状况的变化。