Significant alteration of soil bacterial communities and organic carbon decomposition by different long-term fertilization management conditions of extremely low-productivity arable soil in South China.
Significant alteration of soil bacterial communities and organic carbon decomposition by different long-term fertilization management conditions of extremely low-productivity arable soil in South China.
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DOI：
10.1111/1462-2920.13098
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发表时间：
2016-06
影响因子：
5.1
通讯作者：
Weibing Xun;Jun Zhao;Chao Xue;Guishan Zhang;W. Ran;Bo-ren Wang;Q. Shen;Ruifu Zhang
中科院分区：
文献类型：
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作者：
Weibing Xun;Jun Zhao;Chao Xue;Guishan Zhang;W. Ran;Bo-ren Wang;Q. Shen;Ruifu Zhang
红壤是一种铁盐性形成土，不同施肥管理对土壤性质和微生物群落有显著影响。红壤低产生态系统中土壤微生物群落和功能与长期施肥管理的关系对土壤微生物生态和农业生产具有重要意义。本文采用16 S重组核糖核酸基因的454焦磷酸测序分析和基于GeoChip 4-NimbleGen的功能基因分析来研究土壤细菌群落组成和参与土壤有机碳降解的功能基因。长期施用含氮化肥导致土壤酸化和肥力下降，并显著改变了土壤细菌群落结构，而长期施用有机肥和休闲管理则改善了土壤质量，维持了土壤细菌多样性。短期生石灰修复酸化土壤没有改变细菌群落。有机施肥和休耕管理支持富营养化生态系统，其中共生类群的相对丰度增加，并具有更高的活性碳降解基因的强度。然而，长期含氮化肥处理支持贫营养生态系统，其中贫营养类群的相对丰度增加，并具有较高的强度，但活性碳降解基因的强度较低。生石灰的应用增加了共生类群和作物产量的相对丰度，虽然这些影响是完全不够的。该研究为红壤生态系统中土壤细菌群落、土壤功能和长期施肥管理的相互作用提供了新的见解;这些见解对于提高独特的低产红壤的肥力具有重要意义。
Different fertilization managements of red soil, a kind of Ferralic Cambisol, strongly affected the soil properties and associated microbial communities. The association of the soil microbial community and functionality with long-term fertilization management in the unique low-productivity red soil ecosystem is important for both soil microbial ecology and agricultural production. Here, 454 pyrosequencing analysis of 16S recombinant ribonucleic acid genes and GeoChip4-NimbleGen-based functional gene analysis were used to study the soil bacterial community composition and functional genes involved in soil organic carbon degradation. Long-term nitrogen-containing chemical fertilization-induced soil acidification and fertility decline and significantly altered the soil bacterial community, whereas long-term organic fertilization and fallow management improved the soil quality and maintained the bacterial diversity. Short-term quicklime remediation of the acidified soils did not change the bacterial communities. Organic fertilization and fallow management supported eutrophic ecosystems, in which copiotrophic taxa increased in relative abundance and have a higher intensity of labile-C-degrading genes. However, long-term nitrogen-containing chemical fertilization treatments supported oligotrophic ecosystems, in which oligotrophic taxa increased in relative abundance and have a higher intensity of recalcitrant-C-degrading genes but a lower intensity of labile-C-degrading genes. Quicklime application increased the relative abundance of copiotrophic taxa and crop production, although these effects were utterly inadequate. This study provides insights into the interaction of soil bacterial communities, soil functionality and long-term fertilization management in the red soil ecosystem; these insights are important for improving the fertility of unique low-productivity red soil.