| 马来眼子菜腐烂分解氮磷转化模型研究 |
| 摘要点击 3224 全文点击 2292 投稿时间：2009-08-17 修订日期：2009-11-09 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 马来眼子菜 模型 分解 降解 氮磷转化 |
| 英文关键词 Potamogeton malaianus Miq. model dissolve decomposition nitrogen and phosphorus transfer |
|
| 中文摘要 |
| 马来眼子菜是太湖水生植被中重要的优势种，其新陈代谢残体腐烂分解过程是湖泊水体营养盐循环重要组成部分.为定量化揭示其腐烂分解规律以及对水体营养盐含量影响，基于室内马来眼子菜腐烂分解试验结果，建立了马来眼子菜腐烂分解氮磷转化模型.模型由马来眼子菜腐烂分解氮转化子模型和磷转化子模型组成，考虑了马来眼子菜体内无机氮磷的溶解、有机氮磷的降解以及边壁对水体中氮磷吸附3个主要过程.模型共有8个状态变量，分别为马来眼子菜体内无机氮、有机氮、无机磷、有机磷，以及水体中总氮、总磷、边壁吸附的氮和磷.模型校验输出的水体总氮、总磷以及最后1 d的马来眼子菜体内氮磷、边壁吸附的氮磷与试验实测值吻合较好，校验获得的马来眼子菜体内无机氮、无机磷溶解释放速率分别为0.04 d-1、0.06 d-1，其体内有机氮、有机磷降解释放速率分别为0.00525 d-1、0.01044 d-1.模型结果显示，马来眼子菜在腐烂分解的前5 d，其体内分别有6.7%、35.8%的氮、磷被分解；磷优先于氮释放，其机制是马来眼子菜残体含有相对较高比例的无机磷；温度变化对马来眼子菜腐烂分解释放氮磷转化过程具有一定影响，但在温度较低时，温度变化对马来眼子菜腐烂分解的影响较小；马来眼子菜分解仅在一定的时间内对水质产生不利影响，其后水体颗粒以及边壁吸附作用能消除这种影响. |
| 英文摘要 |
| Potamogeton malaianus Miq. is one of the dominant species of submerged aquatic vegetations in Lake Taihu, China. The decomposition of its debris and metabolic detritus is an important part of nutrients cycling in the lake water. Nitrogen and phosphorus transfer model in P. malaianus Miq. decomposition has been set up based on an indoor P. malaianus Miq. decomposition experiment to quantitatively characterize the decomposition process. It mainly focuses on the dissolving process of inorganic nitrogen and phosphorus in P. malaianus Miq., the degradation process of its organic nitrogen and phosphorus, and the boundary’s adsorbing process of nitrogen and phosphorus in water. There are eight state variables in the model, including inorganic and organic nitrogen in P. malaianus Miq., inorganic and organic phosphorus in P. malaianus Miq., total nitrogen and total phosphorus in water, and nitrogen and phosphorus adsorbed on container boundary. The model calibration showed a good accordance with the observed results of P. malaianus Miq. decomposition experiment. The dissolve rates of inorganic nitrogen and phosphorus in P. malaianus Miq. are 0.04 d-1 and 0.06 d-1 respectively. And the decompose rates of these two state variables are 0.00525 d-1 and 0.01044 d-1 respectively.Model outputs show that 6.7% nitrogen and 35.8% phosphorus can release from P. malaianus Miq. in the former 5 days. Phosphorus release is prior to nitrogen due to the bigger inorganic/organic ratio of phosphorus than that of nitrogen in P. malaianus Miq.. Decomposition of P. malaianus Miq. could be affected by water temperature, and the affection is slight when water temperature is lower according to the model. The model also showed that P. malaianus Miq. decomposition process has influences on water quality in the former days, which can be eliminated by adsorbing process later. |
