模拟氮沉降对三江平原湿地小叶章生物量及分配的影响  

Effects of Nitrogen Decomposition on Biomass and Allocation of Deyeuxia Angustifolia in Freshwater Marsh in Sanjiang Plain

作　　者：赵光影[1,2] 窦晶鑫[3] 郝冬梅[1] 

机构地区：[1]哈尔滨师范大学黑龙江省普通高等学校地理资源与环境遥感重点实验室,黑龙江哈尔滨150025 [2]中国科学院东北地理与农业生态研究所湿地生态与环境重点实验室,吉林长春130012 [3]农业部管理干部学院,北京102208

出　　处：《地理与地理信息科学》2012年第4期103-106,共4页Geography and Geo-Information Science

基　　金：中国科学院湿地生态与环境重点实验室开放基金(WELF-2009-B-002);中国科学院知识创新工程重要方向项目(KZCX2-YW-309);哈尔滨师范大学青年学术骨干资助计划项目(09XBKQ04);黑龙江省教育厅科学技术研究项目(12511165);黑龙江省科技创新团队建设计划(2010td10)

摘　　要：在非淹水、淹水两种水分条件下模拟氮沉降变化(分别相当于氮沉降0g/(m2.a)、1g/(m2.a)、3g/(m2.a)、5g/(m2.a))对三江平原典型湿地植物小叶章生物量及其分配的影响。结果表明,不同水分状况下氮沉降均促进小叶章生物量的积累,且以N5水平下生物量增加最多(p<0.05)。小叶章各器官生物量增长程度对氮沉降的响应并不一致:非淹水条件下根生物量平均增长最大(54.5%),其次是叶(31%)、茎(19.2%);淹水条件下小叶章各部位的生物量增长更为显著,其中根生物量平均增长124.7%,叶、茎生物量分别增长62%和61.1%。氮沉降明显促进了根生物量的积累,提高根生物量的分配比例。生长季的氮沉降对于改变湿地的营养状况、刺激植物生长具有直接的生态意义。An experiment was carried out with treatments different in nitrogen level（equivalent to 0 g/（m2·a）,1 g/（m2·a）,3 g/（m2·a）,5 g/（m2·a） nitrogen deposition rate） and water level（non-flooded,flooded） to investigate biomass and allocation of Deyeuxia angustifolia in freshwater marsh in Sanjiang Plain.The results showed that the biomass of Deyeuxia angustifolia increased significantly after nitrogen decomposition,with largest biomass occurred under N5 level.The responses of biomass increment of plant to nitrogen deposition differed in apparatus.The increment of root biomass was up to 54.5% with non-flooded condition.The leaf and stem biomass were also enhanced,which were 31% and 19.2% higher than the control treatment.Under flooded condition,the increment of root,leaf,and stem were up to 124.7%,62% and 61.1%,respectively.Nitrogen deposition enhanced belowground biomass significantly,and increased belowground biomass allocation.Nitrogen deposition in growth season played a direct and ecological role on improving nutrient condition of freshwater marsh and promoting plant growth.

关 键 词：氮沉降 三江平原湿地 小叶章 生物量 分配格局 

分 类 号：X144[环境科学与工程—环境科学]