抚仙湖沉水植物分布及其碳、氮和磷化学计量学特征  

Distribution and carbon,nitrogen and phosphorus stoichiometric characteristics of submersed macrophytes in Lake Fuxian

作　　者：李威[1] 符辉[2] 曹特[3] 张霄林[3] 钟家有[2] 倪乐意[3] 谢平[3] 樊后保[1] 

机构地区：[1]南昌工程学院,江西省退化生态系统修复与流域生态水文重点实验室,南昌330099 [2]江西省水利科学研究院,江西省鄱阳湖水资源与环境重点实验室,南昌330029 [3]中国科学院水生生物研究所东湖湖泊生态系统试验站,武汉430072

出　　处：《湖泊科学》2017年第2期448-457,共10页Journal of Lake Sciences

基　　金：江西省科技计划项目(20151BAB214006,20161BBG70048);水利部鄱阳湖水资源水生态环境研究中心开放基金项目(ZXKT201511);水利部科技推广项目(TG1520);国家水体污染控制与治理科技重大专项(2012ZX07105-004)联合资助

摘　　要：目前对于沉水植物碳(C)、氮(N)和磷(P)化学计量学的野外研究主要集中在中营养或富营养化水体,而对于贫营养水体中沉水植物C、N和P的积累特征研究较少.基于对贫营养湖泊抚仙湖沉水植物的调查,研究抚仙湖9种常见沉水植物C、N和P化学计量学特征及其种间和种内差异.结果表明:1)抚仙湖沉水植物主要分布在湖岸浅水区域,分布水深范围为0.5~14.0 m,平均分布水深为3.6 m;2)抚仙湖沉水植物地上部分C、N和P含量平均值分别为381.89、18.59和2.13 mg/g,N∶P比平均值为9.21,且C、N和P含量之间呈显著正相关;3)抚仙湖沉水植物地上部分C、N和P含量及C∶N比和C∶P比值种间差异大于种内差异,而N∶P比种内差异大于种间差异;4)抚仙湖沉水植物C含量和N:P比平均值要大于长江中下游一些富营养化湖泊的沉水植物,抚仙湖沉水植物的生长可能潜在地受到P的限制.Field studies on carbon （ C）, nitrogen （N） and phosphorus （P） stoichiometry of submersed macrophytes commonly fo- cus on mesotrophic or eutrophic waters, while plant stoichiometric characteristics in oligotrophic waters, which may he different from those in mesotrophic or eutrophic waters, arc rarely involved. This work aimed to study the stoichiornetric characteristics of submersed macrophytes in an oligotrophic lake, the Lake Fuxian, which is of great significance for comprehensive understandings of elemental biogeochemical cycles in lakes. We conducted a field investigation on the distribution of submersed macrophytes in the Lake Fuxian and measured the morphological and C, N and P stoichiometric characteristic of nine common submersed macrophyte species. Intraspecific and interspecific coefficients of variation （CV） of stoichiometric characteristics of the sampled plants were also compared. The results revealed that submersed macrophytes distributed mainly in the shallow water depths （ ranging from 0.5 m to 14.0 m with a mean value of 3.6 m） in the Lake Fuxian. The mean values of C, N and P contents in the aboveground parts of the nine species were 381.89, 18.59 and 2.13 mg/g, respectively, with an average N ：P ratio of 9.21. The C, N and P contents of the plants were significantly positively correlated. Interspecific CV of the C, N and P contents and the C ：N and C ：P ratios were higher than the intraspecific CV, while intraspecific CV was higher than the interspecific N ：P ratio. The C contents and N ：P ratios of sub-mersed maerophytes in the Lake Fuxian were higher than most of those in the middle and lower reaches of the Yangtze River. The results indicated that the growth of submersed macrophytes in the Lake Fuxian was potentially limited by P.

关 键 词：抚仙湖 沉水植物 分布 碳、氮、磷 化学计量学 

分 类 号：X173[环境科学与工程—环境科学] X524