对人工湿地园中沼泽植物水蓼(Polygonum hydropiper L.)蒸腾特性日变化进行了研究。结果表明:水蓼叶片的蒸腾速率日进程在晴朗的天气呈单峰曲线变化,最高峰值出现在下午的14:00。受光量子通量密度的影响最大,相关系数为0.668。与相对湿度的变化呈正相关(r=0.607),说明水蓼的蒸腾速率日变化是受其自身所具有的特殊生理特性所决定。叶片气孔阻力直接影响蒸腾速率。

The daily variation of transpiration characteristics for Polygonum hydropiper L. in constructed wetland was studied. The results show that the daily variation of transpiration rate for leaves has the changing tendency of singlet in sunny days,with the highest value appearing at 14:00. It is significantly influenced by the flux density of photons, with the correlation coefficient r= 0.668. There is a obviously positive relationship between transpiration rate and relative humidity(r= 0.607), so the daily variation of transpiration rate for P. hydropiper is controlled by its physiological characteristics, and the stomatal resistance will directly influence the transpiration rate of this species.