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底泥利用是指将疏浚底泥直接或经过改造后用于农田、林地、草地、湿地、市政绿化、育苗基质及严重扰动的土地修复与重建等方面,使底泥重新进入自然界的物质循环和能量流动。蚯蚓粪作为一种特殊的有机肥,富含植物生长所需的多种营养元素,同时蚯蚓粪还具有良好孔性、通气性和保水性。理论上用蚯蚓粪可以改善底泥物理性质、平衡底泥中的养分和提高有机质含量,将底泥改造成植物生产性能优良的人造土壤(也称技术新成土)。将蚯蚓粪与太湖底泥按一定比例混合、稳定化,研究其物理、化学性质及生物学性质的变化。设置CK、T1、T2、T3、T45个处理,其中CK为空白,即太湖底泥(黑底泥),T1、T2、T3、T4处理的蚯蚓粪添加量分别为5%、10%、15%、20%。试验结果表明,添加一定量的蚯蚓粪能有效改变底泥的物理、化学性质,使其能更好地适合植物生长,其中当蚯蚓粪添加量为10%时改良底泥效果达到最佳,最有助于白菜对氮、磷元素的吸收和茎叶的快速生长。
Sediment utilization refers to the dredging of sediment directly or after transformation for the use of farmland, woodland, grassland, wetlands, municipal afforestation, nursery substrate and severe disturbance of land restoration and reconstruction, so that the sediment back into nature, material circulation and Energy flow. Vermicompost as a special organic fertilizer, rich in plant nutrients required for growth, while vermicompost also has good porosity, aeration and water retention. In theory, the use of vermicompost can improve the physical properties of the sediment, balance the nutrients in the sediment and increase the organic matter content, and transform the sediment into man-made soil with good plant production performance (also called new-technology soil). The vermicompost and the Taihu Lake sediment by a certain percentage of mixing, stabilization, study of its physical, chemical and biological properties of the changes. CK, T1, T2, T3 and T45 treatments were set up. Among them, CK was blank, that is, the sediment of the Taihu Lake (black sediment), and the additions of vermicompost T1, T2, T3 and T4 were 5%, 10% and 15% %, 20%. The results showed that adding a certain amount of vermicompost could effectively change the physical and chemical properties of the sediment to make it more suitable for plant growth. When the amount of vermicompost added was 10%, the effect of improving the sediment was the best Help cabbage on nitrogen and phosphorus absorption and the rapid growth of stems and leaves.