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测定3种盐沼植物体内TN、TP、重金属Cu、Zn、Pb和Cd的含量,计算了3种盐沼植物地上部分TN、TP和重金属库的大小。结果表明,3种盐沼植物在养分的分配模式上显著不同,3种盐沼植物地上部分重金属含量均低于地下部分;互花米草地上部分的养分库和重金属库均大于芦苇和海三棱镳草,表明其对养分和重金属的吸收与滞留效率更高。如果从湿地植物净化的角度来考虑,收获互花米草对河口环境的净化作用最佳,特别对P的去除效率最高;但另一方面,互花米草的入侵将会显著改变长江口湿地生态系统的生物地球化学循环过程,如提高沉积物中重金属的生物可利用性,有可能把更多的重金属输入河口水体和食物网,使湿地成为重金属的源而不是汇。
The contents of TN, TP, heavy metals Cu, Zn, Pb and Cd in three salt marsh plants were determined, and the size of aboveground TN, TP and heavy metal pools in three salt marsh plants were calculated. The results showed that there were significant differences among the three types of salt marsh plants in their nutrient allocation patterns. The contents of heavy metals in the aboveground parts of three salt marsh plants were lower than those in the underground part. The nutrient pools and heavy metal pools in aboveground parts of Spartina alterniflora were larger than those of Phragmites australis and Haizi Agkistrodon acutus, indicating that its nutrient and heavy metal absorption and retention efficiency higher. If considered from the point of view of purification of wetland plants, the effect of Spartina alterniflora on the purification of estuary environment is the best, especially the removal efficiency of P is the highest; on the other hand, the invasion of Spartina alterniflora will significantly change the Yangtze River Estuary wetlands The biogeochemical cycles of ecosystems, such as increasing the bioavailability of heavy metals in sediments, have the potential to import more heavy metals into estuarine waterways and food webs, making wetlands a source of heavy metals rather than sinks.