水生植物分解过程中生态化学计量学特征研究

发布时间：2018-02-02 20:43

本文关键词： 碳氮磷干物质化学计量学水生植物　出处：《水生态学杂志》2017年06期 　论文类型：期刊论文

【摘要】：为揭示水生植物分解过程中的生态化学计量学特征,选取沉水植物苦草(Vallisneria natans)和马来眼子菜(Potamogeton malaianus)以及漂浮植物浮萍(Lemna minor),分别置于温室(处理组A、B)和池塘中(处理组C),实验时间为5周,每隔1周随机从各重复组中取1份样品,测定干物质重和总氮(TN)、总碳(TC)、总磷(TP)含量,分析其残存干物质的分解过程。结果表明,在整个分解过程中,3种植物的C/N为7.43~10.06,低于全球水平22.5,C/P为43.09~91.77,明显高于全球水平23.2,说明同一种植物在相同的同化C能力前提下,对N的利用效率较高,对P的利用率较低;N/P为4.71~9.24,小于14,说明植物主要受N的限制。沉水植物苦草和马来眼子菜的C/N在温室和自然条件下规律一致,而漂浮植物浮萍则变化较大,说明沉水植物分解C和N的速率一致且不受环境影响,而漂浮植物浮萍分解C和N受环境影响较大;苦草和浮萍残存干物质C/N在开始有一个快速增长期,说明这2种植物N的释放速率超过C;3种植物残存干物质的C/P和N/P都在第1周快速增长且各处理变化较大,说明3种植物P分解速率都在1周内超过C和N,且受环境影响较大。研究结果将对水生态修复过程中是否移除残存水生植物提供理论依据。
[Abstract]:In order to reveal the characteristics of ecochemometrics in the decomposition of aquatic plants. The submerged plants Vallisneria natansa, Potamogeton malaianus and the floating plant duckweed were selected. Lemna minor. They were placed in greenhouse (treatment group Anb) and in pond (treatment group C _ (2)) for 5 weeks. One sample was randomly taken from each repeated group every 1 week to determine dry matter weight and total nitrogen (TNN). The decomposition process of the residual dry matter was analyzed. The results showed that the C / N of the three plants was 7.43 ~ 10.06 during the whole decomposition process. Lower than the global level of 22.5% C / P was 43.09 ~ 91.77, which was significantly higher than that of the global level of 23.2, which indicated that the same plant had higher N use efficiency under the condition of the same assimilation ability of C. The utilization rate of P was low; The N / P was 4.71 ~ 9.24, less than 14, indicating that the plant was mainly restricted by N. The C / N ratio of the submerged plants was consistent with the natural conditions in greenhouse and natural conditions. The rate of decomposition of C and N by submerged plants was the same and was not affected by environment, while the decomposition of C and N by floating plants was more affected by environment. There was a rapid growth period at the beginning of dry matter (C / N) residual in the two species, which indicated that the N release rate of the two plants was higher than that of C. The C / P and N / P of the three plant residues increased rapidly in the first week, which indicated that the decomposition rate of P was higher than that of C and N in the first week. The results will provide theoretical basis for the removal of residual aquatic plants in the process of water ecological restoration.
【作者单位】：中冶华天工程技术有限公司;中国科学院南京地理与湖泊研究所湖泊科学与环境国家重点实验室;
【基金】：南京市科技计划项目(201608016) 国家自然科学基金(31270409)
【分类号】：X173
【正文快照】： 生态化学计量学的概念是在2000年由Elser第一次明确提出的(Elser et al,2000a),其理论被生态学家所认同,研究主要集中于全球碳(C)、氮(N)、磷(P)生物地球化学循环和生态学过程、植物限制性元素的判断等领域(Bryan et al,2012)。植物是生态系统的一个重要组成部分,对生态系统的

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