【作者】 张俊；

【导师】 朱伟；

【作者基本信息】 河海大学 ， 环境科学， 2006， 硕士

【摘要】 对受损和退化的水生态系统进行生态修复和重建是我国水环境领域中的研究热点。研究表明沉水植被的恢复是水生态修复的关键,沉水植物作为水体生态系统中主要的初级生长者,通过增加空间生态位、抑制生物性和非生物性悬浮物、改善水下光照和溶解氧条件,为形成复杂的食物链提供了食物、场所和其他必要条件;也间接支持了肉食和碎食食物链,是水体生物多样性赖以维持的基础。 沉水植物对水体的环境效应建立在其能够正常生长的前提之下,因此研究沉水植物的适生环境就显得尤其重要。影响沉水植物生长的主要因素包括光、上覆水和底质。其中底质作为沉水植物根系固着的基础,同时也是沉水植物吸收营养物质的来源,其性质对沉水植物的生理、生长有重要的影响。 本文的主要研究工作为: 1、通过对太湖底质的化学性质与沉水植物生长状况的调查,初步明确了处于旺盛生长期的苦草的根系活力及其与底质化学性质之间的相关关系。 2、研究了底质中氨氮和硝态氮的含量对沉水植物生长的影响,确定了底质中氨氮和硝态氮对沉水植物的生长产生胁迫作用时的浓度范围。 3、研究了底质物理性质中颗粒组成和密度对沉水植物生长的影响,初步明确了适合沉水植物生长的底质颗粒组成及密度的特点。更多还原

【Abstract】 Aquatic ecosystem rehabilitation and restablishment have received more and more attention nationally in water environment field of China. Prevenient research shows the revegetation of submerged macrophytes is the base for water ecosystem rehabilition. As the main primary producer of aquatic ecosystem, submerged macrophyte is the base to mentain biodiversity of water-bodies. This kind of macrophytes provide food, site and other necessary conditions to build the complicated food chain, it also sustain camivorous and detritus food chain indirectly as well, by adding ecological space, restraining biotic and abiotic suspend substance, and improveing environmental factors such as the light intensity and dissolved oxygen.Because water were improved by submerged macrophyte was based on nicer growth of submerged macrophyte, Study on the condign circumstance of submerged macrophyte growth was very important. The primary factors of affecting submerged macrophyte were light, water and sediment. The characters of sediment affect enormously growth and physiology of submerged macrophyte, because sediment was bedrock of the root of submerged macrophyte and was source of subemerged macrophyte needful nutrition.The main work in the thesis was summarized as follows:1、 Study on the relation between chemic character of Tai lake sediment and submerged macrophyte. The root active of Vallisneria natans L in the bloom and the relation between the root active and chemic character of sediment were known.2、 Study on the effect ammonia-nitrogen, nitrate- nitrogen of sediment to growth of submerged macrophyte. The concentrations of ammonia-nitrogen, nitrate- nitrogen restraining the growth of submerged macrophyte were known.3、 Study on the effect particle composition, bulk to growth of submerged macrophyte. particle composition, bulk of the better growth of submerged macrophyte were known.更多还原