LI-6400 portable photosynthesis system

LI-COR的便携式气体交换系统允许人们在光照条件下测量叶片的光合速率，并在黑暗中测量叶片和其他器官的呼吸速率。它还允许测量蒸腾速率，这在研究植物对干旱的反应时至关重要。根据措施的类型和所研究的植物类型，有许多室可供使用。我们将使用这种设备来确定在何种程度上的春季短命植物，鳟鱼百合，每年的增长是有限的，其灯泡的增长能力。要做到这一点，我们需要测量叶片固定碳的能力，并估计鳞茎利用这些碳进行自身生长或将其储存为淀粉的能力。虽然许多经济用途的植物的生长受到其固碳能力的限制，但许多野生物种在使用其叶子固定的碳方面表现出一定的限制。更好地克服这一限制是很重要的，因为它对植物利用与全球变暖相关的大气CO2增加的能力有重大影响。这些研究还可以为这种类型的植物开发生长模型。该设备还将用于测量和比较黑云杉林下层（灌木和乔木）北方树种的光合作用速率和氮利用效率，作为评价皆伐或部分采伐后生理适应性研究的一部分。不同物种的养分和水分利用效率的估计可能有助于我们理解物种之间的竞争关系后，收获干扰。这种竞争最终影响了立场动态和黑云杉的商业革命。

The portable gas exchange system from LI-COR allows one to measure both the photosynthetic rate of leaves under light conditions and the respiratory rate of leaves and other organs in the dark. It also allows the measurement of transpiration rates, which are of primary importance when studying the response of plants to drought. Many chambers are available, depending on the type of measures and the type of plants under study. We will use this equipment to determine to which extent the annual growth of a spring ephemeral, the trout lily, is limited by the growth capacity of its bulb. To do so, we need to measure the capacity of the leaves to fix carbon and estimate the capacity of the bulb to use this carbon for its own growth or to stock it as starch. Although growth of many plants of economical use is limited by their capacity to fix carbon, many wild species exhibit some limits to use the carbon fixed by their foliage. It is important to better characterise this limitation because it has major impact on the capacity of the plants to take advantage of the atmospheric CO2 increase associated with global warming. These studies could also allow growth models to be developed for such type of plants. The equipment will also be used to measure and compare rates of photosynthesis and nitrogen use efficiency among boreal species in the understory (shrubs and trees) of black spruce stands, as part of a study evaluating physiological acclimation following clearcut or partial harvest. The estimation of nutrient and water use efficiency of the different species may contribute to our understanding of the competitive relationships between species after disturbance by harvest. This competition ultimately influences the stand dynamics and the commercial revolution of black spruce.