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大叶藻的克隆生长特征

郑凤英,刘雪芹,金艳梅,李乐乐,韩晓弟**   

  1. (山东大学(威海)海洋学院, 山东威海 264209)
  • 出版日期:2013-11-10 发布日期:2013-11-10

Clonal growth characteristics of Zostera marina L.

ZHENG Feng-ying, LIU Xue-qin, JIN Yan-mei, LI Le-le, HAN Xiao-di**   

  1. (Marine College, Shandong University at Weihai, Weihai 264209, Shandong, China)
  • Online:2013-11-10 Published:2013-11-10

摘要: 对威海双岛湾大叶藻(Zostera marina L.)的克隆生长特性进行了研究。结果表明:该水域中,大叶藻克隆片段中仅有3个级别的分株;其间隔子(3.85 cm)和节间长(0.92 cm)较短,属密集型克隆构型;2010年8月—2011年3月,每个克隆片段根状茎总长延伸了20.39 cm、共产生了22.17个根状茎节和5.41个分株,表现出了极其有限的克隆扩展能力;克隆片段在根状茎伸长、节数增加、净生产量分配、单株平均生物量、分株形态上均以母株占绝对优势、子一代又优于子二代;新老叶片不断更替的叶片生长模式使得其克隆片段须将较多的资源投资于叶,故其总净生产量和总生物量分配均以叶为主;母株的叶、根状茎和根三构件生物量分配比例近乎相等,而子代生物量分配仍以叶为主,这可能预示着大叶藻克隆片段不同级别分株间存在着克隆分工现象;研究结果提示,于秋初在我国选取合适的海域对大叶藻进行健康分株移植较为可行。

关键词: CO2浓度升高, 植物光合作用, 稳定同位素示踪, 土壤碳循环

Abstract: The study on the clonal growth characteristics of Zostera marina L. in Shuangdao Bay of Weihai, East China showed that in the clonal fragments of the Z. marina, only three connected ramet generations were observed. The Z. marina was found to have a phalanx clonal architecture, with spacer length and internodal length being 3.85 cm and 0.92 cm, respectively. From August, 2010 to March, 2011, the total length of the rhizomes of each clonal fragment elongated by 20.39 cm, and a total of 22.17 nodes and 5.41 ramets were produced, suggesting the limited clonal expansion. As compared with daughter and granddaughter ramets, mother ramets had higher biomass and node number, longer rhizome, and bigger size. The clonal fragment allocated the largest proportion of total net production and total biomass to leaves due to the resource and energy requirements from the leaf-replacing growth type of Z. marina. Mother ramets allocated the similar proportion of biomass to leaves, rhizomes, and roots, whereas daughter and granddaughter ramets allocated their most amounts of biomass resources to leaves. The different patterns of biomass allocation for mother and daughter (and granddaughter) ramets could reflect the functional specialization of ramets. Our results implied that it was more feasible to transplant healthy Z. marina ramets in Chinese northern sea area in autumn.

Key words: plant photosynthesis, stable isotope tracing technique, soil carbon cycling., elevated atmospheric CO2 concentration