Hybrid poplar productivity under high forest and short rotation woody crop systems under boreal conditions

在加拿大发现的所有树种中，杂交杨树的生长潜力最快。然而，它们的使用是最近在加拿大的北方地区，和一些不确定性仍然在不同的网站条件和造林管理方案下，他们的耐寒性和生长性能。利用已建立的人工林，我们首先要确定环境因素和栽培措施对速生杂交白杨人工林产量的影响。更具体地说，我们试图1）评估几个杂交白杨品种种植沿着一个大的土壤气候梯度覆盖Abitibi-Témiscamingue和北魁北克地区的产量潜力和2）确定的文化系统（即高林种植园与短轮伐期矮林）和施肥对种植园产量的影响。最终，我们寻求确定一系列土壤气候条件和栽培品种特征（例如，分支形式、根系、生理）以及有利于粘土带地区或西北部更高产量的栽培实践。魁北克。这一项目的结果将使在北方条件下运作的加拿大工业能够选择适当的管理做法，在高森林和短轮伐期木本作物系统下最大限度地提高生物量产量。研究结果将指导管理（工业和监管机构），并在林业工作者的工具包中实现使用这些快速增长的人工林，以生产至少部分木材供应，靠近米尔斯，并最终减少对天然林的依赖，缓解木材短缺和公共土地上的采伐限制。

Hybrid poplars have the fastest growth potential of all tree species found in Canada. Their use is however relatively recent in the boreal zones of Canada, and some uncertainties remain in relation to their hardiness and growth performance under differing sites conditions and silvicultural management scenarios. Using already-established plantations, we first want to determine the effects of environmental factors and cultivation practices on the yields of fast growing hybrid poplar plantations. More specifically, we seek to 1) evaluate the yield potential of several hybrid poplar cultivars planted along a large pedo-climatic gradient covering the Abitibi-Témiscamingue and Nord-du-Québec regions and 2) determine the effects of cultural system (i.e. high forest plantation vs. short rotation coppice) and fertilization on plantation yields. Ultimately, we seek to determine the set of pedo-climatic conditions and cultivar characteristics (e.g. branch form, root system, physiology), and cultivation practices that are conducive to greater yields in the clay belt region or north western Quebec. Results of this project will allow the Canadian industry operating under boreal conditions to choose appropriate management practices to maximize biomass yields under high forest and short-rotation woody crops systems. The results will guide management (industrial and regulators) and materialize the use of these fast-growing plantations in the toolset of foresters to produce at least part of their timber supply, close to mills, and ultimately be less reliant on natural forests and alleviate wood shortages and harvesting limitations on public lands.