间作对刺梨园土壤团聚体化学计量特征和养分贡献率的影响  

Effects of intercropping on stoichiometric characteristics and nutrients contribution rate of soil aggregates in Rosa roxbunghii Tratt.orchard

作　　者：吴传美 何季[1] 吴文珊 蔡俊 向仰州 WU Chuanmei;HE Ji;WU Wenshan;CAI Jun;XIANG Yangzhou(College of Agriculture,Guizhou University,Guiyang 550025,China;School of Geography and Resources,Guizhou Education University,Guiyang 550018,China)

机构地区：[1]贵州大学农学院,贵州贵阳550025 [2]贵州师范学院地理与资源学院,贵州贵阳550018

出　　处：《浙江农业学报》2023年第5期1132-1143,共12页Acta Agriculturae Zhejiangensis

基　　金：贵州省科技计划(黔科合基础-ZK〔2021〕一般133,黔科合后补助〔2020〕3001);国家自然科学基金委员会贵州省人民政府喀斯特科学研究中心项目(U1612442)。

摘　　要：设置玉米刺梨间作、辣椒刺梨间作、刺梨单作3种种植模式,对比不同种植模式下刺梨园土壤团聚体的生态化学计量特征、速效养分含量和土壤养分贡献率,揭示间作对刺梨园土壤团聚体化学计量特征和土壤养分的影响。结果表明:间作可有效提高刺梨园0~20 cm土层土壤大团聚体(粒径≥0.25 mm)的养分含量,玉米刺梨间作对不同粒级团聚体有机碳的提升效果优于辣椒刺梨,但辣椒刺梨间作对不同粒级团聚体全氮和速效养分的提升效果优于玉米刺梨间作。在0~20 cm土层,各粒级团聚体的碳氮比整体表现为间作>单作,但氮磷比表现为间作<单作,说明长期间作可增加土壤氮素对刺梨生长的限制作用,而长期单作易导致土壤磷素对刺梨生长产生限制。间作模式下,大团聚体对土壤有机碳、全氮、全磷、碱解氮、有效磷、速效钾的贡献率分别为41.2%~56.8%、44.8%~58.2%、46.3%~60.0%、51.9%~62.3%、52.4%~66.3%和43.5%~58.9%,而刺梨单作的贡献率分别为31.1%~31.6%、30.6%~38.7%、30.6%~46.4%、37.9%~52.8%、30.8%~38.9%和27.2%~38.6%。综上,在刺梨园采取适宜的间作模式有利于增加土壤大团聚体含量及其对土壤养分的贡献率,从而提升刺梨园土壤养分的供给能力。To reveal the effects of intercropping on the stoichiometric characteristics of soil aggregates and soil nutrients in Rosa roxbunghii Tratt.orchard,three planting modes of corn-Rosa roxburghii intercropping,pepper-Rosa roxburghii intercropping and Rosa roxburghii monoculture were set up,and the eco-stoichiometric characteristics,available nutrients contents and soil nutrients contribution rate of aggregates in Rosa roxburghii orchard under different treatments were studied.The results showed that intercropping could effectively improve the nutrients contents of large aggregates(particle size≥0.25 mm)in the 0-20 cm soil layer of Rosa roxbunghii orchard.The effect of corn-Rosa roxburghii intercropping on improving the organic carbon content of soil aggregates was better than that of pepper-Rosa roxburghii intercropping,yet the effect of pepper-Rosa roxburghii intercropping on improving the contents of total nitrogen and available nutrients of soil aggregates was better than that of corn-Rosa roxburghii intercropping.In 0-20 cm soil layer,the C/N ratio of aggregates was higher under intercropping than that under monoculture,yet the N/P ratio of aggregates was smaller under intercropping than that under monoculture.Based on this,it was inferred that the long term intercropping could enhance the limiting effect of soil nitrogen on the growth of Rosa roxburghii,while the long term monoculture could enhance the limiting effect of soil phosphorus.Under intercropping modes,the contribution rates of large aggregates to soil organic carbon,total nitrogen,total phosphorus,alkali-hydrolyzable nitrogen,available phosphorus and available potassium were 41.2%-56.8%,44.8%-58.2%,46.3%-60.0%,51.9%-62.3%,52.4%-66.3%and 43.5%-58.9%,respectively,under intercropping,while the contribution rates were 31.1%-31.6%,30.6%-38.7%,30.6%-46.4%,37.9%-52.8%,30.8%-38.9%and 27.2%-38.6%,respectively,under monoculture.In conclusion,intercropping was conducive to increase the content of large aggregates and their contribution to soil nutrients,so as

关 键 词：间作 刺梨 土壤团聚体 土壤养分 化学计量特征 

分 类 号：S158[农业科学—土壤学]