不同坡位火力楠林土壤肥力变化特征

对不同坡位的火力楠林土壤肥力动态进行了研究。与2004年相比,2007年火力楠林上坡、中坡和下坡的土壤容重、毛管孔隙、非毛管孔隙、总孔隙变化不明显,土壤含水量显著增加;3个坡位的土壤pH值均略有减少,土壤有机质、全氮和全钾含量显著增加,全磷含量减少;3个坡位的土壤碱解氮、速效磷及中坡和下坡的速效钾含量显著增加,上坡的速效钾含量略增。2004和2007年火力楠林的土壤物理性质无明显变化规律。2004和2007年,3个坡位的pH值相近,土壤有机质、全氮和全磷含量均表现为：下坡〉中坡〉上坡。2004和2007年,土壤碱解N含量为中坡和下坡大于上坡,3个坡位的速效磷含量均相近。2004年上坡和中坡的速效钾含量小于下坡,2007年速效钾含量则表现为：下坡〉中坡〉上坡。

Changes of Soil Fertilities in Michelia Macclurei Stands with Different Slope Positions

The study on changes of soil fertilities was conducted in Michelia macclurei stands with different slope positions in 2004 and 2007.Compared with those in 2004,no significant changes in the soil density,capillary porosity,non-capillary porosity,total porosity and capillary moisture were observed in the upper-slope,middle-slope and lower-slope,whereas the natural water significantly increased in 2007.The pH value of the three positions decreased slightly,the contents of soil organic matter,total N and total ...