封育补植恢复森林植被的土壤改良效应

Research on Soil Improvement Effects of Restored Forest Vegetation by Mountain-closuring and Re-plantation

利用封育补植技术对多代萌生次生针阔混交林进行植被恢复,选择针叶、阔叶、针叶+阔叶3种绿化模式为对象,研究其植被恢复后对林地土壤理化性状的影响。结果表明:植被恢复加速了土壤团聚体的形成;提高土壤水分和通透性,容重减少1.4%～18.1%,毛管持水量增加27.5%～130.2%,总孔隙度增加13.1%～31.4%;促进土壤养分恢复,与对照区比较,其有机质、全氮、全磷、全钾相对增量分别达4.93%～87.85%、13.41%～41.67%、13.67%～40.91%和0.28%～0.99%。

This paper adopted mountain-closuring and re-plantation technology to restore the vegetation of multi-age, bud secondary and needle-broad mixed forest. The three models of coniferous forest, broadleaf forest and coniferous-broadleaf mixed forest were chosen to study the changes of soil physical and chemical properties in the restored vegetation. The results showed that the restoration of vegetation could speed up the formation of soil aggregate and improve the soil moisture and aeration. In addition, it reduced 1.4% - 18. 1% of soil bulk density, increased 27. 5% - 130. 2% of soil water content and 13.1% - 31.4% of total porosity. It could also enhance contents of soil nutrients. Compared with the corresponding regions, the content of organic matter, total nitrogen, total phosphorus and total potassium was increased by 4.93 % - 87. 85% ,13.41% -41.67% ,13.67% -40.91% and 0.28%-0.99% respectively.