人工修复措施对退化高寒草甸土壤生态化学计量特征的影响OA

[Objective]The study aimed to explore the effects of artificial restoration measures on the soil eco-logical stoichiometry of degraded alpine meadows.[Method]Ecological stoichiometry was employed to analyze al-terations in soil properties in moderately degraded alpine meadows on the sunny slopes of the Yellow River source area,The study included treatments of application of organic fertilizer(OF),no-tillage reseeding(NR),and applica-tion of organic fertilizer+no-tillage reseeding.[Result]Both OF and NR treatments significantly increased soil moisture content and bulk density,and NR significant increased soil pH,Furthermore,OF treatment significantly in-creased in soil carbon(C)content and ammonium nitrogen content,while both OF and NR led to higher soil nitrogen(N)and phosphorus(P)contents,The soil exhibited an average C∶N ratio of 11.08,a C∶P ratio of 117.36,and an N∶P ratio of 11.10 under various restoration measures,The average ratios of MBC∶MBN and MBC∶MBP were 3.88 and 20.49,respectively,with an average MBN∶MBP ratio of 5.29,Correlation analysis revealed that soil microbial biomass in alpine meadows varied with soil moisture content throughout the vegetation restoration process,Soil bulk density was significantly positively correlated with soil N and P contents and the N∶P ratio,but significantly nega-tively correlated with the C∶N ratio.[Conclusion]The combined application of organic fertilizer+no-tillage reseed-ing not only can restore degraded alpine meadows in the short term,promote plant growth and improve soil nutrients,but also effectively alleviate the main soil nutrient limitations that restrict plant growth,creating more favorable soil nutrient conditions for plant recovery and growth.