Effects of Reseeding Patterns on Plant Community Characteristics and Soil Nutrient in Desert Steppe
To assess the influence of reseeding on desert steppe vegetation recovery,a fenced reseeding experiment was established in a Stipa breviflora-dominated desert steppe.Five treatments were imple-mented:a control with no seeding(CK),monocultures of Psathyrostachys juncea(XX),Agropyron crista-tum(BB),Medicago falcata(HH),and an intercropping treatment with all three species(BXH).The experiment was conducted during the growing season(August).Plant community surveys and soil and plant sample analyses were performed.The results showed that reseeding significantly increased plants aboveground biomass(P<0.05),with Psathyrostachys juncea monocropping showing the greatest positive effect(P<0.05).Meanwhile,reseeding decreased the height and density of perennial forbs.Although the Margalef index increased with reseeding,the effect was not significant.No significant changes were observed in the Shannon-Wiener or Pielou indices.Soil total carbon,total nitrogen,and total phosphorus contents tended to increase with reseeding,but these effects were not statistically significant.Correlation analysis revealed that average plant height and coverage were significant factors affecting aboveground bio-mass.Soil total phosphorus content significantly affected plant height,and there was a significant positive correlation between total nitrogen content and total phosphorus content in soil(P<0.05).These preliminary findings suggest that reseeding has a positive effect on desert steppe vegetation and soil properties,provid-ing a valuable reference for future desert steppe restoration efforts.
Desert steppeReseedingPlant Community characteristicsSoil nutrientPlant func-tional group
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