3种水生植物对铅污染水体的抗性研究

通过盆栽试验，在静态模拟自然状况下的小型水体中设置3个铅污染水平，研究花叶芦竹、石菖蒲、水生鸢尾对不同浓度铅污染水体的净化能力及其抗性生理特征。结果表明：在不同浓度铅污染水体中，石菖蒲的长势最好，其株长和茎长均达到最高，可达61.17 cm和41.23 cm；花叶芦竹的根长则表现为最好，为21.23 cm。3种水生植物的根系活力表现为花叶芦竹>石菖蒲>水生鸢尾。在低浓度和高浓度铅污染水体中，石菖蒲的叶绿素a含量高于水生鸢尾和花叶芦竹，水生鸢尾的叶绿素b含量高于石菖蒲和花叶芦竹；在CK和低浓度铅污染水体中，3种水生植物的叶绿素a含量、叶绿素b含量和总叶绿素含量均表现为最高。花叶芦竹对铅污染水体的净化能力最强，净化能力随着铅浓度的增加也发生了下降。因此，花叶芦竹、石菖蒲和水生鸢尾3种水生植物对不同浓度铅污染水体均有一定的适应性和净化效果，表现为石菖蒲的适应性较强，花叶芦竹净化效果最好。

Resistance of 3 Aquatic Plants to Lead Polluted Water

Through the pot experiment, 3 lead pollution levels were set in small water bodies under static simulation of natural conditions. The purification ability and resistance physiological characteristics of different concentrations of lead-contaminated water were studied in Arundo donax, Acorus tatarinowii, Iris tectorum. The results show that among different concentrations of lead-contaminated water, Acorus tatarinowii has the best growth, and its plant length and stem length are the highest, reaching 61.17 cm and 41.23 cm. Arundo donax have the best root length with a value of 21.23 cm. The root activity of the 3 aquatic plants shows as Arundo donax > Acorus tatarinowii > Iris tectorum. In the water polluted by low concentration and high concentration of lead, the content of chlorophyll a in Acorus tatarinowii is higher than that in Arundo donax and Iris tectorum. The content of chlorophyll b in Iris tectorum is higher than that in Arundo donax and Acorus tatarinowii. The content of chlorophyll a, chlorophyll b and total chlorophyll of 3 aquatic plants are the highest. The purification capacity of Arundo donax decreases with the increase of lead concentration. In general, Arundo donax, Acorus tatarinowii and Iris tectorum have adaptability and purification effects on water polluted by different concentrations of lead. Acorus tatarinowii has strong adaptability, and Arundo donax has the best purification effect.