太湖食物网生态化学计量学特征空间差异

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摘要在太湖藻型湖区和草型湖区分别采集水环境和各营养级生物样品，利用生态化学计量分析方法，检测2个湖区水环境及食物网各组分的碳、氮、磷元素含量和比例.结果显示：藻型湖区的环境样品（水样和沉积物样）具有相对较高的碳氮磷元素含量，除了沉积物样的TOC和TN外，草、藻湖区的水样和沉积物样的碳氮磷元素含量有显著差异（P<0.05），生物样品的碳氮磷元素含量的空间差异较小，高营养级物种的元素含量较低营养级物种相对恒定；藻型湖区环境样品的C：N、C：P和N：P比值较草型湖区低，两湖区间仅有沉积物的C：P和C：N具有显著的空间差异（P<0.05），低营养级物种的碳、氮、磷元素比例变动性较高营养级物种大；草、藻湖区食物网均存在营养级间化学计量不平衡现象.上述空间差异，可能与草藻湖区所受的外界污染输入量差异有关，而高营养级生物的化学元素含量和比例较为稳定，也体现了其生态化学计量的内稳态特征.

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	徐德琳
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	安树青

关键词 ：生态化学计量学特征, 浅水湖泊, 生态系统, 空间异质性, 碳氮磷

Abstract：Environmental samples (water and SOM) and biological samples were collected from the algae-dominated zone and macrophyte-dominated zone, respectively, in Lake Taihu. The content and ratio of TOC, TN and TP of environmental samples and biological samples of these two lake zones were analyzed to explore the spatial differences within ecological stoichiometric characteristics of Lake Taihu food web. Results show that, the elemental carbon, nitrogen and phosphorus contents of the environmental samples in the algae-dominant zone were higher than those of the macrophyte-dominated zone. Furthermore, there were significant differences within environmental TOC, TN and TP, except for the TOC and TN of SOM. The elemental content was stable for species in the higher trophic levels between these two lake zones. The C:N, C:P and N:P ratios of environmental samples in the algae-dominated zone were lower than that in the macrophyte-dominated zone; however, only the C:P and C:N of SOM in these two lake zones showed significant differences (P<0.05). In addition, groups in the lower trophic levels of the food web showed more variability of element ratios within the two lake zones. Thus, a stoichiometric imbalance exists in the food webs of both lake zones. These spatial differences may be related to different pollution inputs for these two lake zones. Furthermore, the relatively stable element content and ratio of the species at the higher trophic levels reflect the stoichiometric homeostasis within food web.

Key words： ecological stoichiometric characteristics shallow lakes ecosystem spatial heterogeneity carbon nitrogen and phosphorus

收稿日期: 2017-05-10

X171

基金资助:国家重点研发计划项目（2017YFC0506606）；江苏省自然科学基金项目（BK20170112）

通讯作者: 安树青,教授,anshq@nju.edu.cn E-mail: anshq@nju.edu.cn

作者简介: 徐德琳(1985-),女,江苏盐城人,助理研究员,博士,主要研究方向为生态系统服务、生态安全格局与湿地生态学.发表论文7篇.

引用本文:

徐德琳, 林乃峰, 邹长新, 王燕, 吴丹, 蔡颖, 安树青. 太湖食物网生态化学计量学特征空间差异[J]. 中国环境科学, 2017, 37(12): 4681-4689. XU De-lin, LIN Nai-feng, ZOU Chang-xin, WANG Yan, WU Dan, CAI Yin, AN Shu-qing. The spatial differences analysis of ecological stoichiometric characteristics of Lake Taihu food web. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(12): 4681-4689.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2017/V37/I12/4681

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