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上海市大莲湖池杉林三种优势植物枯落物分解动态

王斌,郑思俊,朱义,巨波,赵慧娟,张群,崔心红**   

  1. (上海市园林科学研究所, 上海 200232)
  • 出版日期:2013-03-10 发布日期:2013-03-10

Decomposition dynamics of the litters from three dominant plant species in Taxodium ascendens forest in Dalian Lake of Shanghai.

WANG Bin, ZHENG Si-jun, ZHU Yi, JU Bo, ZHAO Hui-juan, ZHANG Qun, CUI Xin-hong**   

  1. (Shanghai Landscape Gardening Research Institute, Shanghai 200232, China)
  • Online:2013-03-10 Published:2013-03-10

摘要:

用枯落物分解网袋法,对上海市大莲湖湿地池杉林内3种优势植物池杉(Taxodium ascendens)、孔雀稗(Echinochloa cruspavonis)、日本看麦娘(Alopecurus japonicus)的枯落物进行了190 d的分解培养,测定了分解速率及其C、N、P养分元素释放动态。用收集器法对池杉林枯落物的数量进行了研究。结果表明,池杉林内池杉每年产生枯落物量为5.70 t·hm-2,是该林地枯落物的主要来源。3种植物枯落物的分解速率(枯落物的干重量损失)依次为日本看麦娘>孔雀稗>池杉。C元素含量在3种植物枯落物中随时间显著下降;N、P元素在池杉枯落物中均有不同程度的富集,而在日本看麦娘和孔雀稗中则没有发生富集-现象。
 

关键词: CO2浓度增高, 水稻, 冠层微气候

Abstract: By using litterbag method, a 190day incubation experiment was conducted to study the decomposition rates and the release dynamics of C, N, and P of the litters from three dominant species (Taxodium ascendens, Echinochloa cruspavonis, and Alopecurus japonicas) in T. ascendens forest in Dalian Lake, Shanghai. In the meantime, the quantity of the litters in the T. ascendens forest was measured by using collection container. In the forest, the annual production of T. ascendens litters was 5.70 t·hm-2, being the primary source of the litters in the forest. The litter decomposition rate (dry mass loss rate) was in the order of A. japonicus > E. cruspavonis > T. ascendens. During the experimental period, the C content of the three species litters decreased significantly, while the N and P contents had somewhat increase in T. ascendens litters but not in E. cruspavonis and A. japonicus litters.