烤烟连作对根际与非根际土壤养分及其生态化学计量特征的影响  

Effects of continuous cropping on soil nutrients and ecological stoichiometric characteristics at rhizosphere and non-rhizosphere of flue-cured tobacco

作　　者：汤宏 王建伟 曾掌权[3] 刘伦沛 阮运飞 梁春华 冷丽娟 TANG Hong;WANG Jianwei;ZENG Zhangquan;LIU Lunpei;RUAN Yunfei;LIANG Chunhua;LENG Lijuan(School of Science,Kaili University,Kaili 556011;Guangxi Key Laboratory of Sericulture Ecology and Applied Intelligent Technology,Guangxi Collaborative Innovation Center of ModernSericulture and Silk,Guangxi Colleges Universities Key Laboratory of Exploitation and Utilization of Microbial and Botanical Resources,School of Chemistry and Bioengineering,Hechi University,Hechi 546300;Hengshan Research Station of Forest Ecosystem,Hunan Academy of Forestry,Changsha 410004,China)

机构地区：[1]凯里学院理学院,凯里556011 [2]广西蚕桑生态学与智能化技术应用重点实验室,广西现代蚕桑丝绸协同创新中心,微生物及植物资源开发利用广西高校重点实验室,河池学院化学与生物工程学院,河池546300 [3]湖南省林业科学院,湖南衡山森林生态系统定位观测研究站,长沙410004

出　　处：《干旱区资源与环境》2024年第10期154-165,共12页Journal of Arid Land Resources and Environment

基　　金：黔东南州基础研究计划项目(黔东南科合基础[2022]15号);贵州省科学技术基金项目(黔科合LH字[2014]7220)资助。

摘　　要：文中探讨贵州省麻江县烟区(研究区)烤烟连作对根际与非根际土壤养分及其生态化学计量特征的影响。通过野外实地调查采样与室内分析相结合,对研究区不同连作年限(0、1、2、3、5和9a)和非植烟区(对照区)的土壤进行了测定分析,研究了土壤pH、有机质(SOM)、全氮(TN)、全磷(TP)和全钾(TK)的含量及其生态化学计量特征。结果表明,随连作年限的增加,烟田SOM、TN呈增加的变化趋势,而TP、TK和pH分别呈波动式增加、降低和降低;同一植烟年限,根际土壤养分含量一般要高于非根际,非根际一般要高于对照区;对照区土壤养分含量呈增加的趋势。与C0(正茬)相比,除TK外,而其他养分均有增加的趋势,根际和非根际土壤C/N无明显差异,而其他计量比值波动式增加。SOC和TN显著或极显著影响根际与非根际土壤的化学计量比;SOC与TN(除对P/K外)及TP对非植烟区土壤生态化学计量比有类似的影响。随连作年限的增加,出现养分间的比例失衡和土壤酸化,钾可能是研究区连作烤烟土壤中的限制性养分,同时应注意氮素的供应;土壤生态化学计量比主要受控于土壤TN、TP和TK及SOC,并与其变化幅度密切相关。The influence of rhizospheric and non-rhizosphere is soil nutrients and their ecological stoichiometric characteristics in tobacco with different continuous cropping years in Majiang county(study region),Guizhou Province,were discussed.A combination study of field investigation with indoor analysis was performed.The soils with different continuous cropping years(0,1,2,3,5 and 9a)and non-tobacco planting areas(control areas)in the study region were analyzed,and soil pH,soil organic matter(SOM),total nitrogen(TN),total phosphorus(TP),total potassium(TK)and their ecological stoichiometric characteristics were studied.The results revealed that:With the increase of continuous cropping years,SOM and TN content in tobacco fields increased,while TP,TK and pH showed a trend of volatility increase,decrease and decrease,respectively.In the same planting year,the nutrient contents in rhizosphere soil were generally higher than that of in non-rhizosphere soil,which in turn were generally higher than that of in the control areas.The soil nutrient contents in the control areas showed an increasing trend.Compared with C0(normal cropping),the nutrients appeared an increasing trend with the increase of continuous cropping years,except for TK.There was no significant difference in C/N between rhizospheric soil and non-rhizospheric soil with the increase of continuous cropping years,while other ecological stoichiometry ratios exhibited a trend of fluctuating increase.SOC and TN were extremely significantly or significantly correlated with ecological stoichiometry of rhizospheric and non-rhizospheric soils.SOC,TN(except for P/K)and TP had similar effects on soil ecological stoichiometry in the control areas.With the increase of continuous cropping years,the proportion of soil nutrients were unbalanced,and soil acidity increased.Potassium may be the limiting nutrient for continuous cropping of flue-cured tobacco in the study region,and attention should be paid to the application of nitrogen.The ecological stoichiometric ratios of soil

关 键 词：烤烟 连作 根际土壤 非根际土壤 土壤养分 生态化学计量比 

分 类 号：S151.93[农业科学—土壤学]