采石场废弃地不同植被恢复模式对土壤微生物数量的影响

Effects of Different Vegetation Restoration Patterns on Soil Microbial Quantity of the Abandoned Quarries

为探明不同植被恢复模式对土壤微生物多样性的影响,对黄石市黄荆山采石场废弃地4种不同植被恢复模式(多花木蓝纯林、多花木蓝×小叶女贞混交林、刺槐纯林、刺槐×盐肤木混交林)的土壤理化性状与土壤微生物数量进行调查分析。结果表明:土壤水分、有机质、全氮、速效磷、速效钾含量及微生物数量在不同植被恢复模式下均有显著或极显著差异;混交林的土壤水分、有机质、全氮、速效磷喝速效钾含量均高于纯林,纯林土壤的全氮及速效氮含量均高于混交林;各植被恢复模式下微生物数量依次为细菌>固氮菌>放线菌>真菌,混交林的微生物总数、真菌、细菌、放线菌数量高于纯林,纯林的固氮菌数量高于混交林;各类群微生物数量与土壤pH、有机质及速效钾含量均呈较好的相关性;综合考虑,不同恢复模式下土壤理化性状和微生物数量分布特征,多花木蓝-小叶女贞混交林能更好地改善土壤环境质量,植被恢复效果较好。

To explore the effects of different vegetation restoration patterns on soil microbial diversity,the soil physical and chemical properties and soil microbial quantity of four kinds of different vegetation restoration patterns（Indigofera amblyantha pure forest,I.amblyantha Ligustrum quihoui mixed forest,Robinia pseudoacacia pure forest,R.pseudoacacia×Rhus chinensis mixed forest）of the abandoned quarries of Huangjing Mountain in Huangshi City were studied.Results：Soil water content,organic matter,total nutrient,available phosphorus,available potassium content and microbial quantity had significant difference under different vegetation patterns;Soil water content,organic matter,total nutrient,available phosphorus and available potassium content in the mixed forest were higher than in the pure forest.Soil total nutrient and available nutrient content in the pure forest were higher than in the mixed forest; The number of microbial quantity was in the order：bacteria 〉 azotobacter 〉actinomycete〉fungi.Microbial quantity,fungi,actinomycete and bacteria mount in the mixed forest were more than in the pure forest.Azotobacter amount in the pure forest were more than in the mixed forest.Soil microbial quantity and pH value,organic matter,available potassium content had good correlation.Based on comprehensive consideration of soil physical and chemical properties and soil microbial,Indigofera amblyantha×Ligustrum quihoui mixed forest had strong capacity of improving greatly the soil environmental quality,that was suitable for vegetation restoration.