摘要 | 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。 |
Abstract | 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. |
关键词 | 蒸腾特性; 水蓼; 日变化; 环境响应 |
Key words | transpiration characteristics; Polygonum hydropiper L.; daily variation; environmental effects |
作者 | 徐惠风1,2,刘兴土1,金研铭2,杨艳清3,徐克章2 |
所在单位 | 1.中国科学院东北地理与农业生态研究所,吉林长春130012; 2.吉林农业大学农学院,吉林长春130118; 3.长春大学职业技术学院,吉林长春130022) |
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基金项目 | 吉林省开发重点项目(松嫩平原湿地的保育模式试验示范); 国家"十五"科技攻关专题(2001BA508B24)共同资助; |