赣南飞播马尾松林林下植被盖度对土壤质量的影响

Effects of Understory Vegetation Coverage on Soil Quality of Aerial Seeding Pinus massoniana Stands in South of Jiangxi Province

为了探明林下植被盖度对赣南飞播马尾松林土壤质量的影响,选取3种林下植被盖度(】70%,30%~70%,【30%)的林分,对其表层(0—10cm)土壤理化性质的16个指标进行比较分析,筛选出土壤容重、田间持水量、土壤有机质、速效磷、pH值作为土壤质量评价指标,运用土壤理化综合指数评价不同林下植被盖度下土壤质量水平。结果表明:3种林下植被盖度间,土壤容重、土壤含水量、饱和持水量、毛管持水量、田间持水量、毛管孔隙度、总孔隙度、pH值存在显著差异(P【0.05);非毛管孔隙度、有机质、全氮、全磷、全钾、速效氮、速效磷、速效钾不存在显著差异(P】0.05)。不同林下植被盖度的土壤理化综合指数存在极显著差异(P【0.01),土壤质量随着林下植被盖度的增加而得到显著提高。

To analyze the effects of aerial seeding Pinus massoniana stands understory vegetation in south of Jiangxi Province on soil quality,16indices of topsoil(0—10cm)physical and chemical properties of three types of understory vegetation(>70%,30%~70%,<30%)were studied.Soil bulk density,field water holding capacity,soil organic matter,available phosphorus and pH value were selected as soil quality indicators.The soil quality levels of different understory vegetation were evaluated by the soil physical and chemical comprehensive index.The results showed that different understory vegetation displayed significant difference in the soil bulk density,soil water content,saturated moisture capacity,capillary water holding capacity,field water holding capacity,capillary porosity,total porosity and pH value(P<0.05),and no significant difference was found with respect to the non-capillary porosity,soil organic matter,total nitrogen,total phosphorus,total potassium,available nitrogen and available phosphorus and available potassium(P>0.05).The different understory vegetation displayed significant difference in the soil physical and chemical comprehensive indexes(P<0.01).The soil quality was improved with the increase of understory vegetation.