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连作对烤烟根际与非根际土壤养分含量的影响 预览 被引量:4

Effect of continuous cropping on soil nutrients at flue-cured tobacco rhizosphere and non-rhizosphere
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摘要 为了明确连作对烤烟烟田养分含量的影响,分析不同连作年限烟田烤烟根际与非根际土壤的养分含量变化。结果表明:①随着烤烟生育进程的推进,不同连作年限烟田烤烟根际和非根际土壤的pH、非根际土壤的有机质含量总体呈先降低后增加的趋势;根际土壤的有机质含量逐渐增加;根际和非根际土壤的全氮和碱解氮含量、非根际土壤速效钾和全钾含量均呈先降后升再降的变化趋势;根际土壤速效钾、全钾和全磷含量及根际和非根际土壤速效磷含量总体呈先增加后降低的趋势;非根际土壤全磷含量呈缓慢下降趋势。②随着连作年限的增加,根际和非根际土壤pH逐渐下降,有机质含量和全量、有效态的氮、磷、钾含量均出现不同程度的累积;根际土壤pH低于非根际土壤,而根际土壤有机质含量和全量、有效态的氮、磷、钾含量高于非根际土壤;连作导致根际与非根际土壤中有效氮、有效磷、有效钾含量比发生变化,相对于速效氮和速效磷含量而言,根际土壤速效钾含量表现为亏缺,而非根际土壤速效钾含量表现为累积。 In order to clear the effects of flue-cured tobacco continuous cropping on soil nutrients, soil chemical properties in rhizosphere and non-rhizosphere at different continuous cropping years of flue-cured tobacco were analyzed. The results showed that pH both at rhizosphere soil and non-rhizosphere soil, and soil organic matter in non-rhizosphere soil decreased firstly and then increased at different growth and development stages of flue-cured tobacco during continuous cropping years. However, the content of organic matter in rhizosphere increased gradually. The total N and available N both in rhizosphere soil and non-rhizosphere soil, and total K and available K in non-rhizosphere soil showed the trend from decrease to increase, and then decrease again. The total K and available K in rhizosphere, the available P both in rhizosphere and non-rhizosphere soil, and the total P in rhizosphere increased firstly and then decreased. However, the total P in non-rhizosphere soil decreased gradually. With the increase of continuous cropping time, the pH both in rhizosphere and non-rhizosphere soil decreased gradually, however, the contents of organic matter, total N and available N, P and K both in rhizosphere and non-rhizosphere soil appeared to enrichment at different degrees. The pH at rhizosphere soil was lower than that at non-rhizosphere soil, however, the content of organic matter, total N and available N, P and K in rhizosphere soil were higher than those in non-rhizosphere soil. Continuous cropping of flue-cured tobacco changed a reasonable proportion of available nutrients both in rhizosphere and non-rhizosphere soil, which could not meet the vast demand for the growth of flue-cured tobacco. Compared with available N and P, continuous cropping resulted in the lack of available K in rhizosphere soil and the enrichment of available K in non-rhizosphere soil.
作者 何俊瑜 陈博 任艳芳 李岭 陆引罡 梁晓超 HE Jun-yu, CHEN Bo, REN Yan-fang, LI Ling, LU Yin-gang, LIANG Xiao-chao (1.College of Agriculture, Guizhou University, Guiyang 550025, China; 2.Guizhou Province Key Laboratory of Tobacco Quality Research, Guiyang 550025, China)
出处 《湖南农业大学学报:自然科学版》 CAS CSCD 北大核心 2013年第6期585-590,共6页 Journal of Hunan Agricultural University
基金 贵州省铜仁地区烟草公司项目(贵铜烟[2009]13) 湖南中烟有限责任公司项目(贵大H110378号)
关键词 烤烟 连作 土壤养分 根际土壤 非根际土壤 flue-cured tobacco continuous cropping soil nutrients rhizosphere non-rhizosphere
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