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研究结果表明,不同退耕还林模式地土壤理化性质均得到不同程度的提高,其变化的程度:封山育林>林草混交>刺槐纯林模式>阳向坡地。封山育林、林草混交、刺槐沙棘混交、刺槐纯林土壤含水量比荒地分别提高了13.44%、7.91%、2.77%、1.03%;封山育林与林草混交模式地有机质含量比纯林分别增加了23.88%、23.88%,全氮分别增加了23.86%、36.2%,刺槐的蓄积量分别增加了67.4%、56.9%。
The results showed that the physical and chemical properties of soil in different models of conversion of cropland to forestry all improved to some extent. The extent of the change was: closing hillsides afforestation> mixing forest and grass> pure locust forestation model> sunny slope. Compared with the wasteland, the soil water content of closed forest, mixed forest and grass, mixed seabuckthorn and seabuckthorn increased by 13.44%, 7.91%, 2.77% and 1.03%, respectively. Compared with the pure forest, the organic matter content increased by 23.88% , 23.88% and total nitrogen increased by 23.86% and 36.2% respectively, while the accumulation of black locust increased by 67.4% and 56.9% respectively.