Seasonal fluctuations in live and dead biomass of Phragmites australis as described by a growth and decomposition model:: implications of duration of aerobic conditions for litter mineralization and sedimentation
Seasonal fluctuations in live and dead biomass of Phragmites australis as described by a growth and decomposition model:: implications of duration of aerobic conditions for litter mineralization and sedimentation
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DOI：
10.1016/s0304-3770(02)00027-x
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发表时间：
2002-07-01
期刊：
影响因子：
1.8
通讯作者：
Karunaratne, S
中科院分区：
文献类型：
--
作者：
Asaeda, T;Nam, LH;Karunaratne, S
我们开发了一个芦苇生长和分解的模型，以评估物质收支和营养循环的芦苇在Neusiedlersee，奥地利。该模型描述了芦苇各器官的生长、立枯枝的倒塌、叶和茎的分解以及这些过程中养分的吸收和释放。该模型进行了校准使用的增长和分解数据从文献中，并随后应用于预测R芦苇站在沼泽生态系统的影响。从其在水中的分解开始，假设在进入厌氧沉积层之前，凋落物在好氧水层中停留6、12或24个月。由于分解随着氧气和温度的增加而增加，因此好氧分解速率（在枯枝落叶转移到厌氧基质之前）显着增加，尤其是从春季到秋季。该模型预测，33%（6个月曝气）和48%（24个月曝气）的年地上生产将在一年内分解，而其余的将留在厌氧基质。春末夏初氮磷释放速率是秋冬季节的1.4倍。预计磷的比例高于氮，以保持被困在厌氧层。在生长季节的氮和磷的吸收超过分解过程中释放4-6和5-7倍，分别。该模型是有用的芦苇占主导地位的沼泽地的养分循环的量化。(C)2002 Elsevier Science B. V.保留所有权利。
We developed a model of Phragmites australis growth and decomposition to evaluate the material budget and nutrient cycles of a reed stand in Neusiedlersee, Austria. The model describes the growth of each organ of R australis, the collapse of standing dead shoots, the decomposition of leaves and stalks, and nutrient uptake and release during these processes. The model was calibrated using growth and decomposition data from the literature, and subsequently applied to predict the effects of R australis stands on a marsh ecosystem. From the start of its decomposition in water, the litter was assumed to stay in the aerobic water layer for 6, 12 or 24 months before entering the anaerobic sediment layer. Because decomposition increases with increasing oxygen and temperature, the aerobic decomposition rate (before the litter was transferred to the anaerobic substrate) increased markedly, especially from spring to autumn. The model predicted that between 33 (6 months aerated) and 48% (24 months aerated) of the annual aboveground production would decompose within I year, while the rest would remain in the anaerobic substrate. Rates of nitrogen and phosphorus release were 1.4 times higher between late spring and the end of summer than during autumn and winter. A higher proportion of phosphorus than nitrogen was expected to remain trapped in the anaerobic layer. The uptake of nitrogen and phosphorus during the growing season exceeded release during decomposition 4-6 and 5-7-fold, respectively. The model is useful for quantifying the nutrient cycles of reed-dominant marshes. (C) 2002 Elsevier Science B.V. All rights reserved.