碟形沼泽湿地水中氮的动态变化及影响因素分析  

Dynamics and affecting factors analysis of nitrogen in the riparian water of Sanjiang Plain

作　　者：王洋[1] 刘景双[1] 窦晶鑫[1] 赵光影[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所,吉林长春130012

出　　处：《生态环境》2008年第6期2132-2136,共5页Ecology and Environmnet

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-309);国家自然科学基金项目(90211003)

摘　　要：通过对三江平原碟形湿地不同植被类型沼泽水体中氮含量的研究表明,漂笩苔草、毛果苔草和乌拉苔草沼泽水体中各形态氮含量具有明显的季节变化特征。总氮(TN)含量在5—10月份的植物生长季节表现为先增加后降低的趋势,不同植被类型沼泽水体TN含量明显不同。NH4+-N是无机氮的主要存在形态,含量比例在44.81%～98.89%之间。在整个生长季,乌拉苔草沼泽水NH4+-N含量呈先增加后降低的趋势,毛果苔草沼泽水NH4+-N含量在8月份具有峰值,漂笩苔草沼泽水NH4+-N含量较低,波动不大。硝态氮(NO3--N)在生长季中期含量较低,而亚硝态氮(NO2--N)含量较高;生长季末期NO3--N含量增高,而NO2--N含量降低。沼泽水体中不同形态氮浓度与植被类型、植被生长阶段密切相关,并且受到水温、降雨、蒸发、农田排水等因素的影响。The regularity of nitrogen concentration in the riparian water covering different genies plants in the Sanjiang Plain were investigated. The results indicate that there are remarkable seasonal features of concentration variations of nitrogen in the Carex pseudocuraica, Carex lasiocarpa and Carex meyeriana mire-wetlands water. The TN concentrations are low at the beginning of the growing season, and then increase from spring to autumn, decrease in October, but fluctuate during the time. The NH4^＋-N concentrations are similar with those of TN because NH4^＋-N is the main form of inorganic nitrogen accounting for 44.81% - 98.89%. NH4^＋-N concentrations in Carex meyeriana mire-wetlands water increase and then decrease during the growing season, and NH4^＋-N concentrations in Carex lasiocarpa mire-wetlands water arrive at the climax in August, and are low and change little in Carex pseudocuraica mire-wetlands water. The NO3^--N concentrations are low from June to July and high in May and September. But the NO2^--N concentrations present the diversification regularity at the same time contrasted with those of NO3^--N. Trough the analysis, the concentrations of nitrogen in the water have closely relations with the plant genies and the plant growing stages, and remarkably affected by temperature, rainfall, evaporation ,paddy drainage and so on.

关 键 词：碟形湿地 氮 沼泽湿地水体 季节变化 

分 类 号：X171.1[环境科学与工程—环境科学]