不同林下植被配置模式对柑橘园的水土流失控制、杂草调控的影响

[Objective]The aim of this study was to explore the control of soil erosion and weed growth in citrus orchards on red soil slopes under different understory vegetation configuration modes,to provide theoretical basis for guiding and assisting the vegetation configuration under citrus orchards in red soil areas,and balancing and coordinating the ecosystem services and economic benefits of citrus orchards.[Method]This study takes the red soil slope citrus orchard in Xinfeng County,Jiangxi Province as the research object.Runoff plots were set up in the newly completed land preparation area of the local citrus orchard.five commonly used citrus orchard grass planting models were established,including Cynodon dactylon&Astragalus sinicus,Cynodon dactylon&Vicia sativa,Cynodon dactylon,Axonopus compressus&Astragalus sinicus,Axonopus compressus&Vicia sativa.Surface runoff and soil flow were collected and measured under each grass pattern.Explore the soil erosion and the loss patterns of soil N and P elements under the comparison of grass seeds and bare slopes in citrus orchards.At the same time,the surface runoff of grass species under citrus gardens in different years was collected and analyzed to study the control effect of soil erosion under natural rainfall conditions in citrus gardens in different years.[Result]Among different understory vegetation configuration modes,Cynodon dactylon and Axonopus compressus have good effects on soil and water conservation and soil element loss in citrus orchards.The effect of different understory vegetation configuration modes on soil erosion control in citrus orchards under natural rainfall conditions is related to vegetation coverage and slope gradient of the orchard.[Conclusion]When establishing citrus orchards on red soil slopes,the combination of Cynodon dactylon and Axonopus compressus patterns can be considered,which can help reduce the amount of soil erosion caused by natural rainfall in citrus orchards.It also helps to control the growth of weeds and is less affected by agricultural machinery.