摘要
为探讨湿地开垦对土壤溶液中可溶性铁迁移的影响,2006年6～9月对三江平原沼泽湿地、草甸湿地和水田土壤溶液中Fe2+含量进行了原位观测。结果表明,不同利用方式土壤溶液中Fe2+的含量在表层和底层较低,且比较稳定;中间某层明显较高,且具有明显的季节变化。湿地开垦对土壤中Fe2+向周围水体的迁移过程具有影响,这一过程发生的位置在表层以下20～40cm深度,而不是在表层。
The shortage of dissolved iron was considered to be one of the main factors limiting the primary productivity in the Okhotsk Sea and the northwest part of North Pacific. While the changes of land use patterns nearby affect the iron input of these water areas. Sanjiang Plain, where there was largest wetlands distribution, is one of the important parts of Amur Basin. Therefore, it could be a significant source of iron supplying to Amur and the ocean. However, large scale wetlands reclamation to agricultural fields during last decades had led to the obvious change of land use pattern, which may induce the significant changes in biogeochemical cycling and the transportation of iron. By now, there is a poor understanding for its behavior in the region. The distribution of ferrous iron, pH, and redox potential （Eh） in pore water of three typical land use types was determined with in-situ method from June to September, 2006. The results showed that Fe^2＋ concentration was nearly stable in deeper and surface water in all observations. The minimum concentration often occurred at a depth of surface layer（0 cm）or deeper layer （60 cm）, and the concentrations were stable with little variety. However, the maximum concentration occurred at a depth of 20 cm for paddy, 40 cm for Deyeuxia angustifolia and the concentrations changed with seasons. The findings are not only interesting in the behavior of Fe, but also used as important evidences in considering the iron transport mechanism from soil to river nearby.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第4期1582-1585,共4页
Journal of Agro-Environment Science
基金
国家自然科学基金(40771035)
中国科学院东北地理与农业生态研究所学科领域前沿项目(KZCX3-SW-NA3-15)
中日合作项目“三江平原铁的生物地球化学作用研究”
关键词
二价铁
分布特征
土壤溶液
三江平原
ferrous iron
distribution characteristics
porewater
Sanjiang Plain
