间作对金沙江干热河谷区油橄榄林地土壤质量、果实性状及产量的影响OA

[Objective]The paper aims to investigate the effects of intercropping on soil quality in olive groves within the dry-hot valley region of the Jinsha River.[Method]Olive monocropping was used as the control(CK),and three intercropping treatments,olive × Polygonatum kingianum(FD),olive × Medicago sativa(FZ)and olive × M.sativa × Lolium perenne × Coreopsis grandiflora(F3)were used as the ob-jects of the study,to comparatively analyze the impacts of the varied intercropping treatments on the physicochemical properties of soil,soil microbial biomass,soil enzyme activities,and the traits of olive fruits and yields.[Result]Compared with monocropping CK,the soil available potassium content in the FD treatment decreased significantly,with a reduction of 54.04％.In the FZ treatment,the contents of soil alkali-hy-drolyzable nitrogen,available potassium and organic carbon decreased significantly,with respective reductions of 77.01％,54.52％and 57.23％,while the available phosphorus content increased significantly,with an increase of 54.51％.However,there was no significant difference in soil nutrient contents in the F3 treatment.All three intercropping treatments significantly increased the proportion of soil water-stable macroaggregates(＞2 mm),the percentage of＞0.25 mm aggregates(R0.25mm),themean weight diameter(MWD)and the geomet-ric mean diameter(GMD),thus improving the stability of soil aggregates.The soil microbial biomass nitrogen content in the FD and FZ treat-ments decreased significantly,with respective reductions of 41.44％and 33.67％,whereas the soil microbial biomass carbon content in the F3 treatment increased significantly,with an increase of 24.49％.The activities of urease and cellulase in the FD and FZ treatments de-creased significantly,with respective reductions of 61.35％,71.12％and 28.57％,35.00％,while the dehydrogenase activity increased sig-nificantly,with respective increases of 57.58％and 41.59％.In contrast,the F3 treatment significantly enhanced the activities of urease,cel-lulase,dehydrogenase and alkaline phosphatase,with respective increases of 9.67％,35.71％,190.80％and 54.32％.In addition,the F3 treatment significantly increased the longitudinal diameter,fruit shape index,single fruit weight,pulp rate and yield of olives,with respective increases of 12.14％,8.96％,26.01％,4.61％and 11.26％.Correlation analysis showed that olive yield showed highly significant positive correlations with soil enzyme activity,soil nutrients,soil macroaggregates and soil stability indicators.[Conclusion]All three intercropping treatments significantly improved the stability of soil aggregates and soil structure in olive groves in the Jinshajiang River dry-hot river valley,but there were some nutrient resource competition and negative effects of intercropping with olive in the FD and FZ treatments,while the F3 intercropping treatment had the best effect on improving the quality of the soil in the groves,fruiting traits and yield,so it is recommended to prioritize the use of mixed intercropping patterns in production.