黄河口滨岸潮滩不同生境下翅碱蓬氮的累积与分配特征  

Characteristics of Nitrogen Accumulation and Allocation of Suaeda salsa in Different Growth Conditions of Intertidal Zone in Yellow River Estuary

作　　者：牟晓杰[1,2] 孙志高[1] 王玲玲[1,2] 董洪芳[1,2] 

机构地区：[1]中国科学院烟台海岸带研究所滨海湿地生态实验室,山东烟台264003 [2]中国科学院研究生院,北京100049

出　　处：《湿地科学》2010年第1期57-66,共10页Wetland Science

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-YW-223);中国科学院"优秀博士学位论文;院长奖获得者"科研启动基金项目(AJ0809BX-035;036);国家自然科学基金项目(40803023);厦门大学近海海洋环境科学国家重点实验室高级访问学者基金(MELRS0918);厦门大学滨海湿地生态系统教育部重点实验室基金;中国科学院烟台海岸带所前沿领域项目(HJ0810BX-047);山东省黄河三角洲生态环境重点实验室开放基金项目(2007KFJJ01)资助

摘　　要：2008年5～11月,采用定位研究方法对黄河口滨岸潮滩不同生境下翅碱蓬(Suaedasalsa)氮的累积与分配特征进行了研究。结果表明,中潮滩翅碱蓬(JP1)和低潮滩翅碱蓬(JP2)不同器官生物量均具有明显季节变化特征,总体表现为JP1高于JP2,二者枯落物量均呈递增变化;JP1、JP2根、茎和枯落物的全氮(TN)含量在生长季均呈递减变化,符合指数衰减模型,而叶的总氮(TN)含量波动变化明显;二者不同器官及枯落物的氮累积量和累积速率(VN)季节变化明显,JP1地上部分的氮累积量和VN一般明显高于JP2,且二者地上部分氮累积量和VN均明显高于地下;JP1、JP2不同部分的氮分配比差异明显,其中叶的分配比最高,分别为(46.91±16.97)%和(55.21±9.79)%,说明叶是翅碱蓬重要的氮累积器官;二者氮的年吸收量和最大现存量分别为5.29g/m2、2.63g/m2和13.76g/m2、3.19g/m2;二者氮的吸收系数(0.0145和0.0065)均较低,而利用系数表现为JP2(0.8243)>JP1(0.3844),JP1在氮的吸收方面要强于JP2,而在利用方面却低于JP2。JP1和JP2生物量、TN含量、累积量、累积速率、分配比以及吸收与利用状况的差异主要与其生态学特性和所处生境的水盐状况有关。From May to November in 2008,positioning research method was used to study the characteristics of nitrogen（N）accumulation and allocation of Suaeda salsa in different growth conditions of intertidal zone in Yellow River estuary.Results showed that the biomass of different organs of S.salsa in middle tidal flat（JP1）and S.salsa in low tidal flat（JP2）showed significantly seasonal dynamics,and the values of JP1 were much high-er than those of JP2.The litter amounts of JP1 and JP2,in whole,increased during growth season.The total ni-trogen（TN）contents in root,stem and litter of JP1 and JP2 decreased during growth season,which could be de-scribed by exponential decay model,while the values in leaf fluctuated greatly.The N accumulation amounts and rates of different organs and litters had significantly seasonal changes,and the values of aboveground organs of JP1 were much higher than those of JP2.In addition,the N accumulation amounts and rates in aboveground part were much higher than those in belowground part.The N allocation ratios of different parts in JP1 and JP2 also had significant differences.Leaf was the important N storage,and the N allocation ratios of JP1 and JP2 were（46.91 ± 16.97）% and（55.21 ± 9.79）%,respectively.The annual N absorption amount and maximum standing crop of JP1 and JP2 were 5.29 g/m2,2.63 g/m2 and 13.76 g/m2,3.19 g/m2,respectively.The N absorption coefficients（0.471 6 and 0.204 6）of JP1 and JP2 were much lower,while the utilization coefficient of JP2（0.824 3）was much higher than that of JP1（0.384 4）,which indicated that JP1 had higher N absorp-tion capability than JP2,but the N utilization capacity was just advers.Further studies showed that the differ-ences of biomass,TN content,N accumulation amount and rate,N allocation ratio,N absorption and utilization status between JP1 and JP2 mainly correlated with their ecological characteristics and the water and salinity con-ditions in their habitat.

关 键 词：翅碱蓬 氮 累积 分配 黄河口 

分 类 号：Q145[生物学—生态学]