沟渠对湿地生物地球化学循环影响初析——以三江平原湿地为例

湿地有其独特的生物地球化学循环,其间许多化学迁移和转化过程不为其它生态系统所共享。沟渠的修建改变了湿地的水文状况,因此影响了湿地的生物地球化学循环。以三江平原湿地为例,从沟渠对湿地化学元素迁移转化、湿地化学元素输入输出和湿地化学质量平衡影响方面分析了沟渠对湿地生物地球化学循环的影响。结果显示,沟渠的修建导致湿地大量化学元素丧失,湿地化学质量失衡,最终引起湿地退化。

Effects of Drainage Ditches on Biogeochemical Cycling in Wetland—Taking Wetlands in the Sanjiang Plain as an Example

Wetlands have unique biogeochemical cycles with many chemical transformations and chemical transport processes that are not shared by many other ecosystems.The construction of irrigation ditches in wetland changes the hydrology state,and thus influences the biological geochemistry circulation.In order to understand the effects of drainage ditches on the biogeochemical cycling in wetland,this paper takes the Sanjiang Plain as an example, and makes a detail introduction to the impacts of drainage ditches on the characteristics of movement,transforma- tion,inputs and outputs of chemical elements and on the chemical mass balance.Results show that a lot of chemi- cal elements are lost because of draining,which causes the degeneration of wetland.