福建中亚热带常绿阔叶林林隙对土壤肥力的影响研究

对比研究福建中亚热带常绿阔叶林林隙土壤和非林隙土壤肥力,分析森林循环阶段中林隙阶段土壤肥力的演变。结果表明,在表层土壤中林隙土壤的容重、总孔隙度、孔隙比、毛管孔隙度增大,非毛管孔隙度、通气度、非毛管孔隙度和毛管孔隙度的比值下降,林隙土壤的通气透水性下降。除表层土壤的最大持水量低于非林隙土壤外,林隙土壤的重量含水率、毛管持水量、最小持水量、贮水量都增大,说明林隙土壤的保水能力加强。林隙表层土壤的全氮、有机质、有机碳低于非林隙土壤,水解性氮和速效钾的含量则高于非林隙土壤,说明林隙环境有利于土壤养分的有效化;速效磷低于林下土壤,说明林隙土壤磷的固定增加。土壤的pH值则略有提高,说明林隙有利于改善土壤的酸环境,增强微生物的活动。

The Effects of Gaps in Central Subtropical Evergreen Broad-leaved Forest on Soil Fertility in Fujian Province

The investigation and analysis were carried out to compare the fertility of gap soil and non-gap soil,and the diversification of soil fertility in gap-phase of forest circular phase.The results showed that the values of soil volume weight,total porosity,void ratio,and capillary porosity in gap topsoil were higher;however,the values of non-capillary porosity,ventilating degree,and non-capillary porosity/capillary porosity,ventilating degree and soil permeability were lower.The values of weight water percentage,capillary water holding capacity,minimum water holding capacity and storage capacity of gap soil were all higher than those of non-gap soil except maximum water holding capacity.The conclusion was that gap soil had better water holding capability.The content of total nitrogen,organic matter,organic carbon of gap topsoil were lower than those of non-gap soil,but the contents of hydrolyzable nitrogen and rapidly available kalium were higher than those of non-gap soil,which showed that the gaps had advantage in soil nutrient transformation.The content of rapidly available phosphorus of gap soil was lower than that of non-gap soil,which showed that gaps soil had larger phosphorus immobilization ability.The increase of soil pH showed that the gaps were advantageous in improving the acid condition and increasing the activity of microbes.