论文部分内容阅读
三种不同生长型芦苇（大型芦苇、中型芦苇、小型芦苇）在一天中最大的光合速率和呼吸速率基本相同，但全天的平均值完全不同，光合速率的平均值是大芦苇最高，中芦苇次之，小芦苇最低，而呼吸速率的平均值则是小芦苇最高，大芦苇次之，中芦苇最低。三种芦苇在中午时均出现明显的光合午休现象，以小芦苇光合午休最为严重，大芦苇最轻。在光合午休期间，小芦苇的气孔导度明显下降且伴随着细胞间隙ＣＯ＿２浓度的降低及气孔限制值的增加，说明小芦苇光合午休的限制因素是气孔因素。大芦苇的气孔导度在中午呈上升趋势，细胞间隙ＣＯ＿２浓度及气孔限制值全天无明显变化，说明大芦苇光合午休的限制因素是非气孔因素。三种芦苇的呼吸速率中午都达到一天中的最高值。
The maximum photosynthetic rate and respiration rate of three different growth type reeds (large-sized reed, medium-sized reed, small-sized reed) were basically the same in one day, but the average value of the whole day was completely different. The average of photosynthetic rate was the highest in the reed Followed by the lowest reed, while the average respiration rate is the highest reed, Reed followed by reed, the lowest. The three kinds of reeds showed obvious phenomenon of midday depression photosynthesis at noon, with the smallest reed photosynthesis nap the most serious, the largest reed. During photosynthesis midday break, stomatal conductance decreased significantly with the decrease of CO 2 concentration and stomatal limitation, suggesting that the limiting factor of midday depression was Stomatal factor. The stomatal conductance of P. grandis showed an upward trend at midday, with no significant changes in CO 2 concentration and stomatal limitation during the whole day, indicating that the limiting factor for midday depression in P. reticulata was non-stomatal factors. The respiration rate of the three reeds reached the highest value of the day at noon.