Dynamic modeling of the growth of Phragmites australis:: model description
Dynamic modeling of the growth of Phragmites australis:: model description
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DOI：
10.1016/s0304-3770(00)00095-4
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发表时间：
2000-08-01
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;Karunaratne, S
建立了淡水生态系统中芦荟单种林分生长动态模型。选取了5个状态变量(地上部、花序、根、老根茎和新根茎的生物量)来描述南方根茎的生长。增长是用数学关系来描述的。林分的净生长是光合作用、呼吸作用、死亡率和地上部分与地下植物器官之间同化物转运的综合效应。以开始生长前的地下生物量(即根茎和根生物量)、日总辐射和日平均气温为输入数据。模型能较好地模拟地上部生物量(枝、茎、叶、穗)、叶面积指数、根茎、新根茎、根生物量和地上部高度的季节变化，大部分参数的相关系数接近1.0。该模型估计了从北部温带地区到较温暖的南部温带地区的光合作用有效辐射转换效率在3.76%到7.19%之间。碳预算是使用建模的预测来构建的。对年净生产量和通量的分析表明，无论气候条件如何变化，一个事件的年通量占总光合作用生产量的百分比几乎保持不变。枝条以及根茎和根的呼吸消耗了相当数量的光合作用产物：25%来自地上部呼吸，40%来自根茎和根呼吸。(C)2000 Elsevier Science B.V.保留所有权利。
A dynamic model was developed to simulate the growth dynamics of a monospecific stand of Phragmites australis in freshwater ecosystems. Five state variables (biomass of shoots, inflorescence, roots, old rhizomes and new rhizomes) were selected to illustrate the growth of P. australis. Growth was described using mathematical relationships. The net growth of the plant stand was the integral effect of photosynthesis, respiration, mortality and assimilate translocation between shoots and below-ground plant organs. Below-ground biomass (i.e. rhizome and root biomass) before the growth commencement, daily total global radiation and daily mean air temperature were input data. The model is capable of simulating the seasonal variation of above-ground biomass (shoots, stems, leaves and panicles), leaf area index, rhizome, new rhizome, root biomass and shoot height with correlation coefficients close to 1.0 for most of the parameters. The model estimated the conversion efficiency of photosynthetically active radiation varying from 3.76 to 7.19% from northern temperate regions to warmer southern temperate regions. The carbon budget was constructed using the modelled predictions. Analysis of annual net production and fluxes showed that irrespective of the varying climatic conditions, the percentage of annual fluxes of an event, as a proportion of the total photosynthetic production remained almost same. The respiration of shoots, as well as rhizomes and roots, was shown to consume a considerable amount of photosynthetic production: 25% by shoot respiration and 40% by rhizome and root respiration. (C) 2000 Elsevier Science B.V. All rights reserved.