沟渠水生植物资源化利用研究

收割沟渠中的水生植物不仅每年带走大量的氮磷污染物,还可将其养分覆盖还田,循环利用,其覆盖茶园后,得出的结论如下:1)覆盖后,改良了土壤理化性状。覆盖与对照茶园相比明显增加了土壤表层(0～20 cm)有机质、全氮、全磷、碱解氮、有效磷的含量,也增加了土壤微生物量氮、磷含量,且其土壤各养分含量均随深度的增加而递减;2)覆盖后,控制了杂草优势种群,减少了杂草种类,也降低了杂草的株高、密度和生物量;3)覆盖后,通过改善茶园的生态条件,提高了茶叶品质和产量。

Utilization of harvested aquatic plants as a mulch

Aquatic plants not only absorb a lot of nitrogen and phosphorus pollutants, but after harvest they may also be used for nutrient mulching, recycling utilization and ground cover in tea plantations. 1) A covering of aquatic plants in tea plantations could improve the physical and chemical properties of the soil. It increased the contents of organic material, total nitrogen, total phosphorus, alkali-hydro nitrogen and available phosphorus in the 0-20 cm soil layer, and, increased the contents of soil microbial biomass nitrogen and phosphorus. The soil nutrient declined with an increase in depth. 2) A covering of aquatic plants in the tea plantation could prevent the domination by weed species by significantly reducing weed density and biomass, thus reducing the competition between weeds and tea trees. 3) A covering of aquatic plants in the tea plantation could improve the growing and ecological conditions of tea gardens and promote the quality and production of tea.