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，拟议的工作将检查控制加拿大北方森林地区选定地点的二氧化碳、水和能源交换的过程。这项工作的一个特别重点是研究干扰和造林做法对森林吸收（捕获和储存）二氧化碳能力的影响。我们将测量大气和森林之间碳、水和能量（CWE）的通量（交换率），研究这些通量如何随季节和年变化，并制定一个方案，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和用于模拟气候变化影响的模型。这项工作是我们了解未来气候变化如何影响森林的基础。实验将在安大略省北部和萨斯喀彻温省北部进行。在安大略省，这项工作将集中在Timmins附近的混合木林上。将研究三个地点：一个伐木地点，一个少年，改良的混合木地点（17岁），和一个老的，完全成熟的地点（76岁）。在萨斯喀彻温省，实验工作将在一系列针叶松林地点进行，这些地点是北方生态系统研究和监测点（BERMS）项目的一部分。所选地点是时间序列的一部分，代表了树木生长的一系列阶段，从幼年（12岁）到成熟（31岁）到老年（90岁）。在研究时序时，我们假设我们可以重建扰动后森林重新生长时CWE通量变化的轨迹。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.