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耐盐碱细菌与有机物料对盐碱土团聚体形成的影响
刘彩霞,黄为一
南京农业大学生命科学学院微生物学系
摘要:
从滨海盐碱土中分离筛选到分解秸秆、产胞外聚合物的耐盐碱细菌,通过土柱和盆栽试验研究其与有机物料相互作用对盐碱土团聚体形成以及植物生长的影响。结果表明,盐碱土中接种既分解秸秆又产胞外聚合物的耐盐碱细菌(菌株 M6),配施未腐熟秸秆,直接在盐碱土中腐熟分解,团聚体形成效果最好,大团聚体含量增加 60% 以上;施加玉米秸秆与施腐熟有机肥相比,前者更有利于盐碱土大团聚体的形成;盐碱土中接种既分解秸秆又产胞外聚合物细菌对团聚体形成的促进作用优于单功能分解秸秆细菌(菌株 J2)或者分泌胞外聚合物细菌(菌株 DF-2);菌株 M6 对盐碱环境下玉米的出苗、生长存活及干物质的积累有促进作用。
关键词:  耐盐碱细菌  有机物料  盐碱土  土壤团聚体  胞外聚合物
DOI:
分类号:
基金项目:
Influence of saline-alkali-tolerant bacteria combined with organic matter on formation of saline-alkali soil aggregates
LIU Cai-xia , HUANG Wei-yi
College of Life Sciences, Nanjing Agricultural University
Abstract:
Column and pot culture experiments were carried out to study the effects of saline-alkali-tolerant bacteria screened from coastal saline-alkali soil combined with organic matter on the formation of saline-alkali soil aggregates and the growth of corn. Results showed that, the inoculation with bacterial strain M6 that can decompose straw and secrete extracellular polymer substances combined with straws that decompose directly in soil has the best effect on the formation of saline-alkali soil aggregates. The percent of large macroaggregates increased to more than 60%. Compared with the decomposed manure the undecomposed straws has a better effect on the formation of saline-alkali soil aggregates. Saline-alkali soil inoculated with bacterial strain M6 has a better effect on the formation of soil aggregates compared with inoculation with bacteria of single function that can decompose straw or secrete extracellular polymer substances. Seed germination, livability and dry weight of maize were all promoted under the inoculation with bacterial strain M6.
Key words:  Saline-alkali -tolerant bacteria, Organic matter, Saline-alkali soil, Soil aggregates, Extracellular polymer substances

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