施肥对典型红壤区桉树人工林土壤理化性质的影响

Effects of Fertilization on Soil Physical and Chemical Characteristics of Eucalyptus robusta Plantations in Typical Red Soil Area

桉树人工林短轮伐期经营对地力消耗严重,特别是在亚热带的红壤区极易造成水土流失。科学施肥能较好地改善桉树林的土壤养分状况,有利于土壤中养分的释放。通过不同的施肥试验,结果表明,各施肥处理土壤养分含量均高于对照组(CK),表明施肥能有效提高土壤肥力,其中以A2B1处理为最优。各样地土壤有机质、氨态氮、速效磷、速效钾含量总体上均随土层深度的增加而下降,且不同土层间均存在显著差异。相关性分析表明,各土壤理化指标间存在复杂的耦合关系。

Short rotation of Eucalyptus robusta plantations causes serious soil nutrient consumption,especially in subtropical red soil area,which is easy to cause water loss and soil erosion.Scientific fertilization can improve the soil nutrient status of Eucalyptus robusta plantations,and is beneficial to soil nutrients release.Through different fertilization experiments,the results showed that the nutrient content of each fertilization treatment group was higher than that of the control group,which indicated that fertilization could effectively improve soil fertility,of which A2B1 treatment was the best.The contents of soil organic matter,ammonia nitrogen,available phosphorus and available potassium decreased with the increase of soil layer depth,and there were significant differences among different soil layers.The correlation analysis showed that there were complex coupling relationships among the soil physical and chemical indexes.