粉煤灰对土壤性质和草坪生长的影响

EFFECT OF FLY ASH ON SOIL PROPERTIES AND GROWTH OF TURFGRASS

为使粉煤灰的利用避开食物链,探讨了粉煤灰在草坪业中的应用。盆栽试验结果表明:粉煤灰施加到土壤后,具有明显的降低土壤粘粒含量,增加速效P、全P及部分金属元素(K、Ca、Mn、Zn、Cu、Cd和Pb)含量的作用,这一效果随粉煤灰施用量的增加而增加。同时,各个处理中的重金属元素Zn、Cu和Pb含量均低于“土壤环境质量标准值”一级标准,但为避免对环境的潜在危害,粉煤灰施加量应该控制在317.29g/kg以内。在施灰量300g/kg(重量比)的土壤中,草坪生长和产量最佳;300g/kg是粉煤灰用作草皮基质的最佳施加比例。

Because application of certain fly ashes in farmland, especially at high rates, can affect quality of the crop and the food chain in general, other application options should be explored. For instance in non-food chain areas, such as turf (sod) farms. By pot experiment, effects of fly ash on soil physical and chemical properties and growth of turfgrass were studied. Results indicate that application of mixture of fly ash and soil could enhance soil physical properties, such as contents of clayey particles, available P, total P and some metal elements, e.g., K, Ca, Mn, Zn, Cu. These effects were in close relation to the application rates of fly ash. At the same time, with higher rates of fly ash, the contents of Pb and Cd were increasing linearly. But the contents of some metal elements, i.e., Zn, Cu, and Pb remianed below the criteria of Grade I of the Quality Standards for Soil Environment (QSSE). According to the criteria of Grade III of the QSSE for cadmium element, the usage of fly ash should be controlled below 317.29 g/kg. Growth and yields of turfgrass were optimal in the treatment of S70F30, so application of fly ash at a rate of 300 g/kg should be an optional recommendations for sod.