Effects of Monoculture and Mixed-sown Grasses on Soil Physicochemical Properties and Microbial Biomass
In order to investigate the effects of different sowing methods on degraded alpine grasslands,the restoration effects of alpine grasslands under single sown of Elymus nutans,mixed-sown of Elymus nutans and Poa pratensis,and mixed-sown of Elymus nutans,Poa pratensis and Elymus sibircus were investiga-ted.The results showed that plant biomass,soil primary nutrients and water content were the highest in the Elymus nutans+Poa pratensis mixed-sown treatment.Soil organic carbon,total nitrogen and total phosphorus contents were the highest in the Elymus nutans+Poa pratensis+Elymus sibircus ley mixed-sown treatment,and the soil pH value was 6.91,which was favourable for plant growth.Microbial biomass carbon,nitrogen and phosphorus contents were highest in this mixed-sown treatment.Correlation and re-dundancy analyses showed that microbial biomass was negatively correlated with soil water content and to-tal potassium content,and positively correlated with other soil physicochemical properties.In summary,the study concluded that the mixed-sown treatment of Elymus nutans+Poa pratensis+Elymus sibircus was the best choice for sowing grass mixtures in degraded alpine meadows.However,a longer period of obser-vation and research is needed to draw more precise conclusions.
万方数据
维普
