污泥堆肥对矿区复垦土壤栽培基质保水能力的影响

污泥堆肥可以有效地用作土壤改良剂和肥料,通过温室盆栽文冠果试验,研究了复垦土壤添加污泥堆肥对复垦植被生长量及土壤含水量和凋萎点的影响.结果表明,污泥堆肥不仅可以促进文冠果的生长,而且可以增强栽培基质的保水性能和植物的抗旱能力.但是,污泥堆肥的用量并不是越多越好,当其用量超过60%时,继续增加污泥堆肥的比例,则植物的吸水能力反而会下降.可见,采用经过堆肥化处理的污泥作为矿区复垦植物栽培基质是可行的无害化途径.

Effects of Sewage Sludge on Water Retention Ability of Planting Substrate in Reclaimed Land of Mining Area

Sewage sludge can be used as soil amendment and fertilizer. Through potexperiment growing Xanthoceras sorbifolia Bunge in greenhouse, effects of applying sewage sludge in reclaimed soil on biomass of plant, soil moisture content, and wilting point are studied. Results show that sewage sludge not only increases the biomass of Xanthoceras sorbifolia Bunge, but also increases the water retention ability of plant subst rate. However, the more sewage sludge added does not mean the higher water retention ability of plant subst rate. The ability of plant subst rate may decreases when continuously adding sewage sludge if the ratio of added sewage sludge is over 60%. So utilization of sewage sludge as planting subst rate in the reclaimed land of a mining area is a feasible way to reuse and dispose of sewage sludge.