文章摘要
刘雨蒙,章守宇,周曦杰,赵旭,徐胜南,向晨.枸杞岛海藻场大型海藻凋落物碳氮稳定同位素分析[J].上海海洋大学学报,2016,25(3):438-444.
LIU Yumeng,ZHANG Shouyu,ZHOU Xijie,ZHAO Xu,XU Shengnan,XIANG Chen.C/N stable isotope analysis of macro algae litters in kelp bed in Gouqi Island[J].Journal of Shanghai Ocean University,2016,25(3):438-444.
枸杞岛海藻场大型海藻凋落物碳氮稳定同位素分析
C/N stable isotope analysis of macro algae litters in kelp bed in Gouqi Island
投稿时间:2016-01-11  修订日期:2016-02-29
DOI:10.12024/jsou.20160101633
中文关键词: 大型海藻  稳定同位素  原位埋袋  枸杞岛
英文关键词: macro algae  stable isotope  litter bag  Gouqi Island
基金项目:国家自然科学基金(41176110)
作者单位E-mail
刘雨蒙 上海海洋大学 海洋科学学院, 上海 201306  
章守宇 上海海洋大学 海洋科学学院, 上海 201306 syzhang@shou.edu.cn 
周曦杰 上海海洋大学 海洋科学学院, 上海 201306  
赵旭 上海海洋大学 海洋科学学院, 上海 201306  
徐胜南 上海海洋大学 海洋科学学院, 上海 201306  
向晨 上海海洋大学 海洋科学学院, 上海 201306  
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中文摘要:
      大型海藻凋落物分解为海藻有机、无机碎屑参与海藻场C、N等养分循环,对维持海藻场较高的净初级生产力有着重要作用。采用 "原位埋袋法",尝试对枸杞岛大型海藻优势种孔石莼(U. pertusa)、细枝软骨藻(C.tenuissima)、舌状蜈蚣藻(G. livida)、瓦氏马尾藻(S.vachellianum)、羊栖菜(H.fusifarme)凋落物的分解过程进行模拟,实验测定分解过程中凋落物有机C含量、有机N含量、C/N和C、N稳定同位素值。结果发现,海藻凋落物δ13C、δ15N值随时间变化趋势变化较复杂,根据凋落物碎屑化过程中不同的分解主导因素,将枸杞岛夏季大型海藻凋落物大致分为淋溶分解期(0~11 d)微生物分解期(11~42 d)。经分析计算,在构建海藻场食物网时,海藻凋落物δ15N值在分解过程中有一定的变动,对同时摄食海藻植株和海藻碎屑的杂食性的初级消费者营养级造成0.4左右偏差。
英文摘要:
      Macro algae contribute to kelp forest C/N nutrient circulation primarily as detritus, maintaining high primary productivity in local food web. Changes in overall δ13C, δ15N signatures and C content, N content, C/N ratios of five dominating kelp(U. pertusa, C.tenuissima, G.livida, S.vachellianum and H.fusifarme) litters in litter bags during degradation were examined. Kelp litters completely rotted over 42 days in the field near Gouqi Island, both organic C content, N content and C/N ratios were depleted after decomposition, as for δ13C and δ15N, there was no significant variation. We divided the whole kelp degradation into two periods which are leaching degradation period (0-11 days) and microbiological degradation period (11-42 days). Furthermore, trophic level changes by 0.4 in four benthonic herbivores as a result of degradation of macroalgae. It's a significant deviation in macroalgae based kelp bed ecosystem food web establishment.
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