摘要
在自然生长条件下,用平板-稀释分离培养法研究了延边地区烟叶质量差异较大的3种类型植烟土壤细菌、真菌、放线菌和6种生理类群微生物数量在烟草生育期内的变化动态。结果表明:延边地区植烟土壤微生物根际效应明显。微生物总量R/S值变化范围在1.19-3.07之间,细菌、真菌和放线菌R/S值变化范围分别是:1.21-3.12、1.37-4.36、0.73-4.71。在烟草生育期内,真菌和放线菌R/S值变幅较大,细菌R/S值变幅相对较小。微生物根际效应在3种类型土壤间存在显著差异,暗棕壤根际效应大于黑砂土和白浆土。氨化细菌、硝化、亚硝化细菌和好气性纤维素分解菌表现出明显的正向根际效应,而好气性固氮菌和钾细菌根际效应受土壤类型和烟株生育期影响呈现正、负两方面的根际效应。结论:在3种类型土壤中,暗棕壤烟株微生物根际效应最明显,根际土微生物多样性、均匀度增加,优势集中度下降,根系微生态环境稳定性增强,更有利于烟株生长发育,这可能是暗棕壤烟叶质量优于黑砂土和白浆土的原因之一。
Bacteria, fungi, actinomycetes, and six physiological groups from three types of soils producing different quality tobacco leaf in Yanbian area were studied by plate-count method. Results showed that there were obvious rhizo- sphere effects. The R/S values of total microbial population ranged from 1.19 to 3.07, and those of bacteria, fungi, and actinomycetes ranged from 1.21 to 3. 12, 1.37 to 4.36, and 0.73 to 4.71, respectively. Rhizosphere effects showed significant variation between different soils, especially in dark brown soil. Further research indicated ammonif- ying bacteria, nitrite bacteria, nitrifying bacteria, and aerobic cellulose decomposing bacteria played a positive role on rhizosphere effects, while effects of aerobic nitrogen-fixing bacteria and potassium bacteria depended on soil type and to- bacco growth stages. Itg concluded that rhizosphere effects of microbes in dark brown earth was significantly higher. It may be one of the reasons that quality of tobacco leaf produced in dark brown earths was better than that in the other two types of soils.
出处
《中国烟草学报》
EI
CAS
CSCD
2011年第6期60-65,共6页
Acta Tabacaria Sinica
基金
吉林省烟草工业有限责任公司重大科技攻关项目(JY2006012)
关键词
烤烟
微生物
土壤类型
生育时期
根际效应
flue-cured tobacco
microbe
soil type
growth stage
rhizosphere effect
