Litterfall and decomposition of Rhizophora mangle L. in a coastal lagoon in the southern Gulf of Mexico
Litterfall and decomposition of Rhizophora mangle L. in a coastal lagoon in the southern Gulf of Mexico
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DOI：
10.1007/s10750-005-0959-x
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发表时间：
2006-04-01
期刊：
影响因子：
2.6
通讯作者：
López-Portillo, J
中科院分区：
文献类型：
--
作者：
Aké-Castillo, JA;Vázquez, G;López-Portillo, J
2002年10月至2003年10月，在墨西哥韦拉克鲁斯州墨西哥湾的热带沿海泻湖，对红树林凋落物的产生和分解动态进行了研究。该地区的特点是三个季节：北风（称为“北”），干燥，多雨。年凋落物产生量（1116 g m（-2））呈季节性变化，其中叶凋落物占70%，旱季有两个高峰，雨季有一个。在每个季节用两种类型的垃圾袋评估叶片分解：细网（1x 1 mm）和粗网（3x 7 mm）。将分解数据调整为单负指数模型。结果表明，粗凋落物袋的分解速率较快，且季节差异显著。然而，这些差异发生在分解的第60天之后，表明沥滤和微生物作用导致超过50%的质量损失。在此之后，水生无脊椎动物的影响是明显的，但取决于气候条件。在雨季，腹足类Neritina reclivata与增加叶片分解率。在'nortes'季节，水生无脊椎动物的影响较小，有两个垃圾袋类型计算的衰减常数没有差异。高凋落物产量代表了有机物质的重要输入，通过分解，可能代表了C，N和P在这个水生系统中的重要来源。
The dynamics of Rhizophora mangle litter production and decomposition were studied in a tropical coastal lagoon on the Gulf of Mexico in Veracruz, Mexico over a year (October 2002-October 2003). This region is characterized by three seasons: northerly winds (called 'nortes'), dry, and rainy. Annual litter production (1116 g m(-2)) followed a seasonal pattern with leaf litter as the main fraction (70%) with two peaks in the dry and one in the rainy season. Leaf decomposition was evaluated with two types of litter bag in each season: fine mesh (1x1 mm) and coarse mesh (3x7 mm). Decomposition data were adjusted to a single negative exponential model. The results indicated faster decomposition rates in the coarse litter bag and significant differences among seasons. However these differences occurred after the 60th day of decomposition, indicating that leaching and microbial action were responsible for more than 50% of mass loss. After this period, the effects of aquatic invertebrates were evident but depended on climatic conditions. In the rainy season, the gastropod Neritina reclivata was associated with increasing leaf decomposition rate. In the 'nortes' season, the effect of aquatic invertebrates was smaller, and there were no differences in the decay constants calculated for the two litter bag types. High litter production represents an important input of organic matter which, through decomposition, may represent an important source of C, N, and P in this aquatic system.