应用木屑和复合肥改良生态恢复基质特性

Properties of Synthetic Soil Improved with Wood Dust and Inorganic Compound Fertilizers Used for Eco-engineering

近年来对应用于高陡石质边坡的生态工程恢复技术核心——人工客土基质的改进研究越来越受到高度重视。对通过木屑和复合肥进行综合改良后人工基质的侵蚀性及其养分流失特性进行探讨,根据17次动态取样的研究结果表明,经过改良后的人工基质土壤流失量在植物发芽0～55d之间,几乎各植物生长期间的差异均达到显著水平(p<0.05),而随植物继续生长,泥土流失量的变化不再显著(p>0.05)。相对于泥土流失量来说,速效养分在土壤中保持相对稳定的时间要提前于泥土损失保持相对稳定的时间,且复合肥的施加浓度越低,其变化越明显。同时,氮流失总量总体上是磷的2倍以上,且其中硝态氮损失速率整体上均高于氨态氮。

Improvement of special synthetic soil used on high steep rock slope, an important coo-engineering technique, has received more and more attention in recent years. Soil was mixed with wood dust and inorganic compound fertilizer. This synthetic soil was applied on the high steep rock slope to observe its erosion and nutrient loss. The synthetic soil on the high steep rock slope was sampled 17 times dynamically with the growth of the plants on the soil. The results showed the soil loss of the synthetic soil was significantly different at p〈0.05 among almost all the plants within 0-55 days after the plants grew but not changed obviously at p〈0.05 when plants continued to grow. The loss of the available nutrients in the synthetic soil was reduced to a stable level earlier than the soil loss of the synthetic soil, and changed more obviously at a higher rate of inorganic compound fertilizer in the synthetic soil. At the same time, the total loss of nitrogen was 2 times higher than the total loss of phosphorus, and the NO3^--N loss was always higher than the NH4^＋-N loss.