古龙酸母液混制肥和草席覆盖措施对新疆旱区牧草生长和土壤养分含量的影响OA北大核心CSTPCD

Residue after evaporation(RAE)is a byproduct generated during the industrial production of vitamin C through two-step fermentation,while Bacillus mucilaginosus is a potassium-solubilizing bacterium.Both play a crucial role in enhancing soil quality,fertility,and plant growth.In this study,a mixed fertilizer(RB)was prepared using a combination of RAE and Bacillus mucilaginosus.Three RB treatments with mass fractions of 0%(CK),0.5%,and 1.0%were applied,along with straw-mat mulched and non-mulched treatments,to conduct field plot experiments.In this field experiment,the growth,physiological indicators,soil nutrient indices,and their correlations of both Medicago sativa and Elymus dahuricus were analyzed.The results demonstrated that RB significantly improved the growth and physiological indexes of forage crops,with higher concentrations of RB showing greater enhancements.In the 1.0%RB treatment,the aboveground biomass of Medicago sativa increased by 112%,while Elymus dahuricus showed an increase of 80.1%.With the same amount of RB applied,germination rates,germination potential,plant height,aboveground biomass,and root development were all significantly higher in mulched treatments compared with non-mulched treatments.The germination rates of Medicago sativa and Elymus dahuricus increased by an average of 164%and 194%,respectively,while the aboveground biomass increased by an average of 64.3%and 24.9%,respectively.Soil organic carbon and nutrient content were effectively increased with the application of RB treatment,particularly with 1.0%RB leading to a 33.1%increase in soil organic carbon and a 105%increase in quick potassium.At the same RB application amount,the mulched treatments could increase the organic carbon content of the soil by an average of 2.75%compared to the non-mulched treatments.Two-way ANOVA revealed significant interaction effects between RB and grass mat mulching on forage growth,physiological indexes,and soil nutrient content.Redundancy analysis and Pearson correlation analysis identified organic carbon,ammonium nitrogen,effective phosphorus,and quick-acting potassium as key factors influencing the growth and physiological indexes of pasture grasses.Based on the findings,it is recommended to use 1.0%RB and grass mat mulching to improve soil quality in arid regions of Xinjiang,facilitating the growth of pasture grasses.This study provides a scientific foundation for the utilization of residue after evaporation,Bacillus mucilaginosus resources,and land development in dry regions like Xinjiang.