• 关键词：湿地  枯落物  汞

• 基金项目：国家自然科学基金(40071072);中国科学院湿地创新项目(KZCX2_302)

• 刘汝海
• 1. 中国海洋大学环境科学与工程学院, 青岛 266003; 2. 中国科学院东北地理与农业生态研究所, 长春 130012

• 王艳
• 中国海洋大学环境科学与工程学院, 青岛 266003

• 王起超
• 中国科学院东北地理与农业生态研究所, 长春 130012

• 吕宪国
• 中国科学院东北地理与农业生态研究所, 长春 130012

• 高俊琴
• 中国科学院东北地理与农业生态研究所, 长春 130012

• 摘要：在野外进行现场实验,研究了2种典型湿地植物枯落物经一个生长季的分解后汞的变化,并探讨了其影响因素.在实验的30d后,2种湿地大部分层次植物枯落物汞的浓度表现为先升高,随后降低,最后又明显升高.枯落物分解程度影响着汞浓度的变化.前90d枯落物质量减少快,且汞的浓度降低,枯落物中的汞以损失为主,后期因植物残体吸附汞的能力增强,汞损失减少.汞的损失率和水中溶解性汞的浓度呈显著负相关关系.在20cm和30cm深度上,枯落物汞的损失率与积水深度和地温都具有显著相关关系(P<0.05).微环境的差异尤其是积水的变化对小叶章各层汞的损失的影响大于毛果苔草.

• Abstract：In the field experiment, temporal variance of mercury of two typical wetlands vegetal litters was researched and the affecting factors were discussed. Mercury concentration of most layers in two litters increased after 30 days, then decreased, and increased at last in the decomposition during a growth season. The variance of mercury concentration was related to the degree of the litters decomposition. At the initial 90 days, the mass of the litter lost quickly, and mercury concentration decreased, so much mercury in litters was lost. The loss of mercury was little at last stage because of the increasing ability of adsorption to mercury. In the depth of 20cm and 30cm, loss of mercury correlated significantly with the depth of inundated water and soil temperature (P<0.05). The difference of microenvironment, especially the change of inundation, affected on the mercury loss of Carex lasiocarpa litters more than Calamagrostis angustifolia litters in different depth.

• Key words：Wetlands  plant litters  mercury

• 
  摘要点击次数： 2215 全文下载次数： 2705