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首页> 外文期刊>Estuarine Coastal and Shelf Science >Nutrient and caloric dynamics in Avicennia marina leaves at different developmental and decay stages in Zhangjiang River Estuary, China
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Nutrient and caloric dynamics in Avicennia marina leaves at different developmental and decay stages in Zhangjiang River Estuary, China

机译：张江河口不同生长发育阶段和腐烂阶段的滨藜叶片的养分和热量动态

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摘要

Avicennia marina is a typical mangrove species in the subtropical coastlines of China. The main objective of this study was to assess nutrient and caloric dynamics in A marina leaves at different developmental and decay stages. Decomposition studies using litter bags suggested that the time required for the loss of half of the initial dry weight (t_(50)) was 19 days. The extracts of A marina leaves contained non-tannin phenolics and tannin phenolics (hydrolysable tannin), but no condensed tannin. Non-tannin phenolics and tannin phenolics contents did not differ significantly from each other at various developmental stages, but decreased rapidly during leaf decomposition. Avicennia marina leaves had high N levels, and both N and P concentrations decreased significantly during senescence. During decomposition, N concentration of the leaf litter increased gradually but the phosphorus concentration showed a decrease in the first week, and both N and P remained the same towards the end of the experiment. The gross caloric value (GCV) of mature leaves was significantly higher than those of young and senescent leaves, while ash-free caloric value (AFCV) did not change significantly during leaf development and senescence. During leaf decomposition, both GCV and AFCV increased gradually and remained the same at late stages. In subtropical Zhangjiang River Estuary, high N levels and lack of condensed tannins in A. marina leaves were responsible for the fast rate of decay. Non-tannin phenolics and tannin phenolics had no great effect on rate of decay. Nitrogen resorption during leaf senescence, and high litter decomposition followed by nitrogen immobilization are the important nutrient conservation strategy for A marina.
机译：Avicennia滨海区是中国亚热带海岸线上的典型红树林物种。这项研究的主要目的是评估不同发育阶段和衰退阶段的滨海叶片的养分和热量动态。使用垃圾袋进行的分解研究表明，损失一半初始干重（t_（50））所需的时间为19天。滨海叶片的提取物中含有非单宁酚和单宁酚（可水解单宁），但不含缩合单宁。非丹宁酚和丹宁酚的含量在各个发育阶段之间没有显着差异，但在叶片分解过程中迅速降低。 Avicennia滨海叶片具有较高的N水平，并且在衰老过程中N和P浓度均显着下降。在分解过程中，叶片凋落物的氮浓度逐渐增加，但在第一周磷浓度却下降，并且在实验结束时氮和磷均保持相同。成熟叶片的总热值（GCV）显着高于年轻叶片和衰老叶片，而无灰卡路里值（AFCV）在叶片发育和衰老过程中没有显着变化。在叶片分解过程中，GCV和AFCV均逐渐增加，并在后期保持不变。在亚热带张江河口，A。滨海叶片中的高氮水平和缺乏单宁的浓缩是其快速腐烂的原因。非单宁酚和单宁酚对衰减率没有太大影响。叶片衰老过程中的氮吸收，高凋落物分解继之以固氮是A滨海地区重要的养分保存策略。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2010年第1期|21-26|共6页
  • 作者

    Hai-Chao Zhou; Shu-Dong Wei; Qi Zeng; Li-Hua Zhang; Nora Fung-yee Tam; Yi-Ming Lin;

  • 作者单位

    Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China;

    rnKey Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China;

    rnKey Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China;

    rnKey Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China;

    Department of Biology and Chemistry, City University of Hong Kong, Hong Kong, China;

    rnKey Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, Fujian, China;

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  • 正文语种 eng
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  • 关键词

    mangroves; degradation; nutrients; energy; leaves; Zhangjiang River Estuary;

    机译：红树林;降解;营养素能源;树叶;张江河口;

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