黄土残塬区泻溜红土坡积体土壤改良效果研究

Research of Improvement Effect of Slope Deposit of Red Soil Slumping Erosion in Remained Loess Area

以黄土残塬区泻溜红土坡积体为研究对象,采用河沙、粉煤灰、锯末和有机肥4种材料作为土壤改良剂,与泻溜红土按照不同配比混合制成试验基质,根据玉米生长状况和收获后的土壤理化性质筛选出最适宜的改良剂及配比。研究结果表明:(1)加入改良剂后,玉米的苗高、地径和生物量在不同配比组间均差异显著,样品+有机肥的苗高、地径和生物量均显著高于其他各组;(2)各配比组间土壤pH值差异不显著,而土壤有机质和全氮含量差异显著;(3)加入改良剂后,各配比组土壤大团聚体占比减小,而小团聚体和微团聚体占比增大。综上,土壤改良剂的加入对泻溜红土的改良产生了积极影响,土壤肥力是影响泻溜红土植物生长的最主要因素。

Taking the slopedeposit of red soil slumping erosion in the remained loess area as a research object,this study used river sand,fly ash,saw dust and organic fertilizer as soil modifiers,mixed with the slope deposit of red soil slumping erosion in different ratios as the experiment stroma. Based on the growing condition and the soil physical-chemical properties after harvest,it chose the optimum modifier and mixture ratio. The results show that a) after adding modifier,the height,ground diameter and biomass of nursery-grown plant have significant difference,because of the different ratios with the same modifier; the height,ground diameter and biomass of nursery-grown plant are obviously better for adding organic fertilizer than that of the other modifiers; b) for the different ratios with the same modifier,the soil pH values have little difference,organic matter content and total nitrogen have significant difference and; c) after adding the modifier,the ratio of macro-aggregates decreases and the ratio of smaller-aggregates and micro-aggregates increase. In conclusion,the soil modifiers have positive effect to the slope deposit of red soil slumping erosion and the fertility of soil is still the main factor to influence nursery-grown plant growth.