减氮条件下生物炭对烤烟根系发育及土壤微生物群落的影响

Effect of biochar on the roots and soil microorganisms of flue-cured tobacco under the condition of nitrogen reduction

为探索减氮条件下生物炭对植烟土壤的烤烟根系生长及土壤微生物种群数量的影响,采用大田试验方式,研究减氮40%条件下添加不同用量的生物炭对旺长期烤烟根系形态指标、根系活力以及土壤微生物数量的影响。结果表明,减氮条件下施用生物炭料可有效增加烟株根系各形态指标,同时增强根系活力,并且对增加土壤酶菌和细菌数量有显著促进作用。相对于对照组,T2(1200 kg/hm^(2))根系长度增加31.12%、根尖数增加31.66%、根系表面积增加55.98%、根系体积增加35.14%;根系活力增强78.57%;土壤中的真菌和细菌数量分别高于对照组34.29%和34.17%。试验表明减氮40%条件下生物炭料能够促进烟株根系各形态指标发育,提高根系活力,增加土壤微生物数量,有利于绿色烟叶的可持续发展。

The study aids to clarify the effects of biochar on root growth and soil microbial population of flue-cured tobacco under the condition of nitrogen reduction.The field test method was used to study the addition of different amounts of biochar under a 40%nitrogen reduction method,and the root morphology and vigor,soil microbial population of flue-cured tobacco were analyzed.The results showed that the application of biochar effectively increased the root morphological indexes of tobacco plants,and at the same time enhanced the root activity,and significantly promoted the increase of soil enzymes and bacteria.Compared with the control group,under root length T2(1200 kg/hm^(2))increased by 31.12%,root tip number increased by 31.66%,root surface area increased by 55.98%,root volume increased by 35.14%;root activity increased by 78.57%;soil mold and bacteria number increased by 34.29%and 34.17%,separately.Therefore,biochar materials can promote the development of tobacco plant root system morphological indicators under 40%nitrogen reduction,increase root vitality,and increase the number of soil microorganisms,which is conducive to the sustainable development of green tobacco leaves.