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为了研究大豆叶的光合能力和对水分欠缺的适应性,我们做了如下土壤水分处理。停止供水,在土壤水分水平下降之后,将其保持在一定水平上。在此期间,据已定的叶位测定了叶片的光合能力,叶和叶肉CO_2扩散传导(gl,gm)及水分状态。1.随着土壤水分的减少,表现光合作用的速度(APS)急剧下降。但缺水时间长的时候,APS在一定程度上有所恢复。2.这一光合作用速度的恢复是以叶的水分状态和低水分状态的叶光合作用活性恢复为基础的,而后者的恢复是以gl,gm的恢复为基础的。
In order to study the photosynthetic capacity of soybean leaves and the adaptability to the lack of water, we have done the following soil moisture treatment. Stop the water supply and keep it to a certain level after the soil moisture level has dropped. During this period, the leaf photosynthetic capacity, leaf CO_2 diffusive conductance (gl, gm) and water status of leaves were determined according to the established leaf positions. 1. As soil moisture decreases, the rate of photosynthesis (APS) decreases sharply. However, when water scarcity time is long, APS recovered to a certain extent. 2. The recovery of photosynthesis rate is based on the restoration of photosynthetic activity of leaf in the watery and low-moisture state, while the recovery of the latter is based on the restoration of gl and gm.