补播对紫色土荒坡草地植物群落及土壤特性的影响OA

[Objective]This study aimed to investigate the effects of different reseeding patterns on plant communities and soil properties in purple soil hilly grasslands,and to provide a scientific basis and technical reference for ecological restoration in this region and similar habitats.[Method]Taking purple soil hilly grasslands as the research object,three reseeding patterns were set up:gramineous forage mixed sowing(B1),leguminous forage mixed sowing(B2),and gramineous and leguminous forage mixed so-wing(B3).Fixed-position observations and systematic analyses were carried out to clarify the variation rules of plant community characteristics and soil physicochemical/biological properties under different patterns,and to reveal the coupling relationships between them.[Result](1)Forage reseeding signifi-cantly reduced plant community density,while significantly increasing community coverage,Margalef in-dex,Simpson index,and Shannon-Wiener index;the aboveground total biomass was most significantly increased under the B3 pattern.(2)Forage reseeding significantly decreased soil bulk density and elec-trical conductivity,and significantly increased soil total phosphorus content,as well as the contents of soil organic carbon,total nitrogen,microbial biomass carbon(MBC),and microbial biomass nitrogen(MBN)in the 0～10 cm soil layer.(3)Except for soil total potassium,there were significant correla-tions between plant community characteristics and other soil properties.(4)Principal component analysis(PCA)revealed that soil organic carbon,total nitrogen,MBC,and MBN in the 0～10 cm layer,as well as total phosphorus,pH,bulk density,and electrical conductivity in the 10～20 cm layer,were the key factors driving changes in plant community characteristics.[Conclusion]The grass-legume mixed sowing pattern(B3)had the most prominent effects on improving the productivity of purple soil hilly grasslands,optimizing plant community structure,and ameliorating soil environment,and can be used as the pre-ferred recommended pattern for ecological restoration in this region and similar habitats.