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通过盆栽试验研究保水剂含量对喷播基质物理性质及抗冲性能的影响。结果表明:不同保水剂含量处理中,保水剂含量与黑麦草出苗率及盖度、容重、孔隙度及抗冲性4种基质效应指标之间不是简单的线性关系,而是符合二次多项式的回归关系。随保水剂含量增加,黑麦草出苗率及盖度、基质孔隙度及抗冲指数呈现先增加后减小的变化趋势;而基质容重随着保水剂的增加而减少。说明保水剂对植物的生长和基质改良作用是在一定的含量范围内,否则就会产生负作用。基质结构转折点是保水剂含量为0.3%,但保水剂含量为0.30%时,黑麦草出苗率和盖度分别最高(55%和0.48),当保水剂含量超过0.3%以后,基质容重会明显偏低(小于0.9),基质的非毛管孔隙度和抗冲指数呈现明显下降趋势。因此,基质中保水剂含量应控制在0.3%以下,有利于形成良好的土壤基质结构,喷播基质具有较高保水效应的保水剂含量应在0.15%～0.30%之间。
Pot experiments were conducted to study the effect of water-retaining agent on the physical properties and impact-resistance of spray-sprayed substrates. The results showed that the content of super absorbent polymer had no linear relationship with the germination rate of ryegrass and the coverage of four substrate effects such as cover, bulk density, porosity and impact resistance, but was in line with quadratic polynomial Return to the relationship. With the increase of the content of SAP, the germination rate and coverage of ryegrass, matrix porosity and impact index showed the trend of first increasing and then decreasing; however, the bulk density decreased with the increase of SAP. Indicating that the super absorbent polymer plant growth and matrix modification is within a certain range of content, otherwise it will have a negative effect. The infiltration rate and coverage of ryegrass were the highest (55% and 0.48) when the content of water retaining agent was 0.30% at the turning point of matrix structure. When the content of water retaining agent exceeded 0.3% Low (less than 0.9), the non-capillary porosity and the impact index showed a significant downward trend. Therefore, the content of water-retaining agent in the matrix should be controlled below 0.3%, which is conducive to the formation of a good soil matrix structure. The content of water-retaining agent with high water-holding effect should be between 0.15% and 0.30%.