珠海淇澳与广州南沙湿地3种植物稳定碳氮同位素组成比较

doi:10.13634/j.cnki.mes20180107

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摘要研究了珠海淇澳和广州南沙3种湿地植物互花米草、芦苇和短叶茳芏的碳、氮含量及其稳定同位素的组成，结果表明外来入侵的C₄植物互花米草在植物体的C含量、C/N值、底泥的δ¹³C值（-23.83‰）和δ¹⁵N值（6.56‰）均显著与本地植物芦苇和短叶茳芏的不同，外来入侵种互花米草对土壤微生物的影响依赖于其密集的根系，使其入侵的潮间带土壤微生物种类、酶活性显著升高，体现出互花米草对湿地系统中C、N循环的深刻影响，为此有必要控制该外来入侵植物的蔓延生长。所测定的芦苇和短叶茳芏的δ¹³C值，表明采样地的芦苇属于C₃植物，而短叶茳芏则为C₄植物。本研究为进一步探讨这3种湿地植物-土壤系统中的C、N循环提供了基础资料。

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	陈伟霖
	缪绅裕
	陶文琴
	龙连娣
	戴文坛
	刘志群
	陈学梅
	易祖盛

关键词：互花米草芦苇短叶茳芏稳定性同位素碳氮

Abstract：Carbon and nitrogen content, and stable isotope composition in Spartina alterniflora, Phragmites australis, and Cyperus malaccensis were measured within three wetland system. The results showed that there were significant differences between the invasive species S. alterniflora, a C₄ plant and native species of P. australis, and C. malaccensis based on the indexes of carbon content, C/N value, and the δ¹³C value (-23.83‰)and δ¹⁵N value (6.56‰) in sediment. The impact of the alien species S. alterniflora on the sediment microbes relying on increase in rhizomatic density, significantly enhancing the species diversity and enzymatic activity of the tidal zone sediment microbes, which clearly demonstrated the impact S. alterniflora can have on the carbon and nitrogen cycles within the wetland ecosystem. Results suggest countermeasures should be taken to control the expanding growth of the invasive species. Based on the δ¹³C values of P. australis, and C. malaccensis determined in this study, the P. australis growing at Pearl River estuary is a C₃ plant, meanwhile C. malaccensis is a C₄ plant. The results provide basic data for further studying on the carbon and nitrogen cycles of these three wetland plants/soil system.

Key words： Spartina alterniflora Phragmites australis Cyperus malaccensis stable isotope carbon nitrogen

收稿日期: 2017-02-28;

PACS:

基金资助:

国家自然科学基金资助项目（31270526）

通讯作者: 缪绅裕,E-mail:miaoshy@gzhu.edu.cn E-mail: miaoshy@gzhu.edu.cn

作者简介:陈伟霖(1988-),男,广东兴宁人,硕士研究生,主要从事湿地生态学研究,E-mail:1159037260@qq.com

引用本文:

陈伟霖,缪绅裕,陶文琴等. 珠海淇澳与广州南沙湿地3种植物稳定碳氮同位素组成比较[J]. 海洋环境科学, 2018, 37(1): 38-42.

CHEN Wei-lin,MIAO Shen-yu,TAO Wen-qin et al. Comparison of stable carbon and nitrogen isotope composition of sediment and three plants species growing at Qi'ao,Zhuhai,and Nansha wetland,Guangzhou,China[J]. Marine Environmental Science, 2018, 37(1): 38-42.

链接本文:

http://hyhjkx.nmemc.org.cn/CN/10.13634/j.cnki.mes20180107 或 http://hyhjkx.nmemc.org.cn/CN/Y2018/V37/I1/38

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