Carbon and water dynamics in Canadian boreal and mixedwood forests: Jack pine in Saskatchewan and mixedwood in Ontario

在接下来的五年里，这项拟议的工作将研究控制来自加拿大北部林区选定地点的二氧化碳、水和能量交换的过程。这项工作的一个特别重点是研究干扰和营林做法对森林封存(捕获和储存)二氧化碳的能力的影响。我们将测量大气和森林之间的碳、水和能量(CWE)通量(交换率)，研究这些通量如何随季节和年际变化，并制定一个计划，将二氧化碳通量从场地扩展到区域水平。这项工作将有助于开发碳交换的生态系统模型，以及用于模拟气候变化影响的模型。这些工作对于我们理解未来可能发生的气候变化将如何影响我们的森林是基本的。实验将在安大略省北部和萨斯喀彻温省北部的地点进行。在安大略省，这项工作将集中在蒂明斯附近的混交林上。将研究三个地点：一个伐木地点，一个幼年改良混交林地点(17年)，和一个老的，完全成熟的地点(76岁)。在萨斯喀彻温省，实验工作将在北方生态系统研究和监测站点(BERMS)项目的一系列杰克松森林站点上进行。选定的地点是代表树木从幼龄(12岁)到成熟(31岁)再到老年(90岁)的一系列生长阶段的时间序列的一部分。在研究时间序列时，我们假设我们可以重建随着森林在扰动后重新生长而变化的CWE通量的轨迹。实际上，我们用空间代替了时间。

Over the next five years, the proposed work will examine the processes that control the exchange of carbon dioxide, water, and energy from selected sites in the Canadian boreal forest zone. A particular emphasis of the work is to study the impact of disturbance and silvicultural practices on the ability of the forest to sequester (capture and store) carbon dioxide. We will measure the fluxes (exchange rates) of carbon, water, and energy (CWE) between the atmosphere and the forest, examine how these fluxes change with season and from year-to-year, and develop a scheme to scale the flux of carbon dioxide from the site to the regional level. The work will contribute to the development of ecosystem models of carbon exchange and to models used to simulate the impact of climate change. Such work is basic to our ability to understand how the likely future climate change will impact our forests. Experiments will be conducted at sites in northern Ontario and northern Saskatchewan. In Ontario, the work will focus on the mixedwood forests located near Timmins. Three sites will be studied: a logged site, a juvenile, improved mixedwood site (17 years old), and an old, fully mature site (76 years old). In Saskatchewan, the experimental work will be conducted on a range of jack pine forest sites that are part of the Boreal Ecosystem Research and Monitoring Sites (BERMS) project. The selected sites are part of a chronosequence representing a series of stages of tree growth from juvenile (12 years old) to mature (31 years old) to old (90 years old). In studying a chronosequence we assume that we can recreate the trajectory of the changing CWE fluxes as the forest regrows after a disturbance. Effectively, we substitute space for time.