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在人工刺槐林改造更新定位观测区，通过对土壤剖面测试分析，结果表明：改造更新后的林地土壤，容重变小，孔隙度增大，液相率提高，通透及保水能力增强。同时土壤ｐＨ值降低，全Ｎ、有效Ｐ和阳离子交换量明显提高，但速效Ｋ含量略有下降。通过１３个单项肥和指标综合评定结果表明，改造更新后林地土壤综合肥力水平显著增强。肥力水平排序为：萌生刺槐林＞２刺－３油＞３刺－３油＞２刺－２油＞１刺－２油＞未改造林。
Through the analysis of the soil profile, the results showed that the soil bulk density of the regenerated forest soil was decreased, the porosity was increased, the liquid phase rate was increased, and the permeability and water retention capacity were enhanced. At the same time, the soil pH value decreased, the total N, available P and cation exchange capacity increased obviously, but the available K content decreased slightly. Through the comprehensive evaluation of 13 individual fertilizers and indicators, the results showed that the comprehensive fertility level of woodland soil increased significantly after the renovation. Fertility levels were as follows: Robinia pseudoacacia> 2 prick-3 oil> 3 prick-3 oil> 2 prick-2 oil> 1 prick-2 oil> unmodified forest.