退化第四纪红粘土重建森林模式及其土壤恢复研究

Study on Rehabilitating Forest Model and Soil Restoration on Degraded Quaternary Red Soil

以江西严重退化第四纪红粘土为研究对象,选择其中9种模式重建的林龄10年的森林,调查土壤理化性状,结果表明:(1)土壤有机质、全N、速效N、全P、速效P明显增加,而且增加幅度最大的是有机质;土壤全钾、有效钾都较大程度提高。(2)土壤有机质、全氮浓度随土层深度明显下降,有效磷、有效钾、有效氮浓度则随土层深度平缓下降,全磷、全钾浓度随土层变化不明显。(3)各重建森林模式的土壤容重、非毛管孔隙度也呈较大幅度降低;毛管持水量、毛管孔隙度呈不同幅度增加;不同重建模式总孔隙度变化的差异较大。

The paper takes degraded quaternary red soil in Jiangxi province as the object of the study. The soil physical property and chemical property of 9 kinds of rehabilitated forests 10-year were investigated. The research results were described as follows: (1) Soil organic matter, total nitrogen, available nitrogen, total phosphorus and available phosphorus are increased obviously. The increase in soil organic matter was the most evident.So do soil total potassium and available potassium.(2) The amount of soil organic matter and total nitrogen decreased obviously with decreasing of soil depth, the amount of available phosphorus, available potassium, available nitrogen decreased slowly,and the change of total phosphorus, total potassium was not obvious with soil depth.(3) Soil bulk density, non-capillary porosity decreased in large degree,and capillary porosity, capillary moisture capacity increased in different degree of different rehabilitated forest. The change of total porosity of different rehabilitated forest were more obvious than that of other physical property.