Effects of different artificial vegetation on soil nutri-ents,enzyme activities and organic carbon pool components in coal mining subsidence areas of resource-depleted cities:A case studyof Huainan City,Anhui Province
[Objective]The effects of different artificial vegetation on soil nutrients,enzyme activity and organic carbon pool components in Huainan coal mining subsidence areawere investigated to provide references for selecting suitable vegetation types and improving soil quality in mine reclamation in this area.[Method]Six artificial types of sample plots,namely unmodified land(bare land),artificial grassland,heathland,Metasequoia woodland,acacia woodland and acacia-sidebark mixed woodland,were selected to study the differences and correlations of soil nutri-ents,enzyme activities and organic carbon pool components.[Result]The experiments showed the followingresults.Planting artificial vegetation effectively reduced the soil pH value.The contents of soil organic matter,total nitrogen,alkaline nitrogen,total phosphorus,and available phosphorus in artificial vegetation land were significantly higher than those in unmodified land,while the contents of total potassium and available potassium were lower than those in un-modified land.Except for catalase,the activities of the other four enzymes were at the lowest level in the unmodified land.The soil urease,polyphenol oxidase,and sucrase contents in the mixed forest of Robinia pseudoacacia and Platy-cladusorientalis were higher than those of other artificial vegetation.There were also significant differences in soil en-zyme activities among different types of artificial vegetation.Except for catalase,there was a significant correlation be-tween the activities of the other four enzymes and soil nutrients.Each artificial vegetation increased the content of each component of soil organic carbon pool to varying degrees.The Total organic carbon and soluble organic carbon of the mixed Robinia-Platycladus forest were higher than those of the other five types of sample plots.The content of soil readily oxidized organic carbon of Robinia pseudoacacia forest reached the highest level in all types of sample plots,and the content of soil microbial biomass carbon of Metasequoia glyptostroboides forest reached the highest level in all types of sample plots.The correlation analysis results indicated that there was a significant correlation be-tween the content of soil organic carbon pool components and soil enzyme activity.The results of redundancy analysis showed that soil organic matter,total nitrogen,total potassium,and available potassium were important influencing factors for soil enzyme activity,accounting for 66.04%of the variation in enzyme activity.[Conclusion]Artificial vegetation improved soil quality and increased the content of soil organic carbon pool components in reclaimed mining areas.Soil enzyme activity significantly affected soil nutrients and organic carbon pool,which could be used to charac-terize the quality of soil fertility and the ability of organic carbon fixation in Huainan coal mining subsidence area.The artificial mixed forest model of Robinia pseudoacacia and Platycladusorientalis had a more significant effect on improv-ing soil fertility and carbon fixation capacity,and had a significant improvement effect on the overall quality of soil and ecological environment in the mining area.
万方数据
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