工程弃渣用作植物生长基质的研究

Experimental Study on the Use of Engineering Spoil for Plant Growth Substrate

为资源化利用工程弃渣,对粒径<2mm的工程弃渣和自然土壤进行了不同体积配比生长实验,结果表明:粒径小于2mm的工程弃渣与自然土壤混合后可以用作植物生长基质,工程弃渣的使用体积比例以50%～70%为宜;工程弃渣风化程度越高,其养分含量、pH值及抗旱保墒能力越适合植物生长,但工程弃渣的养分含量一般比较贫乏,需额外添加肥料才能满足植物生长对养分的需求;工程弃渣与自然土壤不同体积配比的混合物的三相没有明显变化规律,但混合物的pH值、养分含量、土壤水分常数、种子发芽率、植株保存率等指标随工程弃渣的体积比例变化而规律变化。

In order to effectively utilize the engineering waste material, engineering spoil with particle size less than 2 mm was mixed with natural surface soil to form suhstrate for plant growth in this study. The result indicated that 50%-70% volumetric ratio of engineering spoil was preferable; the spoil with higher weathering degree had better nutrient and pH condition, water retention capability and drought resistance that facilitate plant growth; however, the nutrient content in engineering spoil was relatively low, thus additional fer- tilizer was required to meet the needs of plant growth; there was no significant difference in three-phase com- position among the substrates with different spoil and soil proportions, but obvious variation tendencies were observed in pH, nutrient contents, soil moisture constant, seed germination rate and plant survival rate.