根系扰动对河口潮汐沼泽植物根际铁异化还原的影响及其机制

项目名称： 根系扰动对河口潮汐沼泽植物根际铁异化还原的影响及其机制

项目编号： No.41501252

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 罗敏

作者单位： 福州大学

项目金额： 20万元

中文摘要： 铁异化还原是河口潮汐沼泽最重要的有机质代谢途径之一。沼泽植物根系扰动会影响根际铁异化还原速率，但影响程度和具体机制如何，这些问题尚未厘清。本申请项目拟以我国东南沿海闽江河口潮汐沼泽为研究区域，以短叶茳芏、芦苇和互花米草三种沼泽植物为研究对象，在沼泽潮滩开展盆栽培养实验，结合分子光谱技术、分子生物学技术和极谱技术，从铁异化还原过程的电子受体和微生物两方面入手，研究河口潮汐沼泽植物根际距离根表不同距离处根系泌氧与铁异化还原的特征；不同种类的滨海沼泽植物根系泌氧特征和根际铁异化还原的差异；滨海沼泽植物生长周期内根系泌氧和铁异化还原速率的动态变化。项目研究成果将对加深植学术界对植物、微生物与土壤三者间物质和能量循环的理解，为评估河口潮汐沼泽铁元素的迁移和归趋，及分析河口潮汐沼泽有机质的代谢途径提供科学依据。

中文关键词： 土壤铁循环；铁循环细菌；土壤碳循环；土壤氮循环；耦合机制

英文摘要： Dissimilatory iron reduction is one of the most important organic matter degradation pathways in estuarine tidal marshes. Root bioturbation of marsh plants is the key to improve the rate of dissimilatory iron reduction in the rhizosphere. But the effect and mechanism of root bioturbation on dissimilatory iron reduction is still unclear. In this research, three types of marsh plants (Cyperus malaccensis, Phragmites australis and Spartina alterniflora) will be cultivated in the tide flat of the Min River Estuary of the East China Sea. The electron acceptors and microbe of dissimilatory iron reduction in the rhizosphere of marsh plants will be deeply analyzed. The goal of this research is to analyze the microspatial variations of root bioturbation and dissimilatory iron reduction in the rhizosphere, figure out the differentiation of root bioturbation and dissimilatory iron reduction among marsh plants, and clarify the dynamic of root bioturbation and dissimilatory iron reduction in the growth period of tidal marsh plants. The findings of this research will benefit the understanding of the matter and energy circle of plant-microbe-soil and provide the scientific basis for iron transfer and organic matter degradation in estuarine tidal marshes.

英文关键词： soil iron cycle;bacteria related to iron cycle;soil carbon cycle;soil nitrogen cycle;coupling mechanisms