Changes of Vegetation Community,Soil Physicochemical Properties and Enzyme Activities Under Different Vegetation Restoration Measures
Different vegetation restoration measures can directly affect plant communities and soil proper-ties,and the characteristics of vegetation communities and soil properties are closely related.In this re-search,Hetian Town,the most serious historical soil erosion area in Changting County,Fujian Province,was taken as the study area.The combination of field plant community survey method and experimental measurement method was used to study the vegetation,soil characteristics,soil microbial enzyme activity,and to evaluate the restoration situation under different restoration measures.The results showed that,1)from the overall plant growth,there was a significant increase in plant species,and Pinus massoniana Lamb and Dicranopteris pedata dominated.After the two different treatment,there was little difference in the growth status of the underground plant communities in the samples.In the three layer,the difference in di-ameter at breast height between the different treatments were 1.72 and 0.54 times greater than those in bare ground and the windswept forests.In the shrub layer and the herb layer,there was a significant difference in the crown width and the height of the grass layer of the different treatment samples compared with that of the bare ground and the windswept forest.The crown width in the shrub layer was 3.4 times that of bare ground and 8.7 times that of windswept forest,respectively.The height of the grass layer was 3.0 times higher than that of bare ground and windswept forest,respectively.2)The soil nutrient content increased to different degrees after different measures of restoration,among which the maximum and minimum val-ues of organic matter content were 22.79±19.32 and 3.33±0.25 g·kg-1 in the wind-water forest and bare land,respectively,indicating that the artificial restoration measures can improve the soil structure,but it still needs a certain amount of time to reach the soil self-ecological balance.In addition,soil su-crase activity and catalase activity showed an increasing trend,and there was no significant difference between soil microbial biomass carbon(MBC)and nitrogen(MBN).3)Nitrogen content in Measure 1 was significantly positively correlated with soil sucrase(P<0.05),which can be seen that sucrase is beneficial to the recovery of vegetation communities and has a promotional effect.The soil phosphorus and potassium contents in the sample plots treated by Measure 2 were also significantly correlated with Simpson's index and Margalef's index(P<0.05),indicating that this measure significantly enhanced the richness and species dominance of plant species.
vegetation restorationsoil and water lossplant communitysoil physicochemical propertiessoil microbial enzyme activity
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