首页|不同利用方式对红壤坡地微生物多样性和硝化势的影响

不同利用方式对红壤坡地微生物多样性和硝化势的影响

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采集了中国科学院桃源农业生态试验站红壤坡地农田、自然恢复林和茶园土壤样品,采用末端限制性酶切片段长度多态性分析(T.RFLP)技术分析土壤细菌、古菌、氨氧化细菌(AOB)和氨氧化古菌(AOA)的多样性,采用好气培养法测定不同土壤的硝化势,研究不同土地利用方式对微生物多样性和硝化势的影响.结果表明:土壤AOB和AOA多样性指数差异不显著,且在3种不同土地利用方式中呈现相同的趋势,均为农田=茶园>自然恢复林;通过RDA分析发现,不同利用方式造成土壤理化性状的改变是影响土壤AOA和AOB群落结构的主要原因;好气培养法测得不同土壤硝化势农田最高,茶园次之而自然恢复林最低;相关性分析显示,硝化势与细菌16S rRNA、AOA和AOB amoA基因多样性指数呈显著正相关,其中与AOA amoA基因关系最为密切;总体来说,红壤坡地不同利用方式改变了土壤细菌、古菌、AOA和AOB的多样性,土壤AOB和AOA积极参与了土壤的硝化过程,且AOA在氨氧化微生物群落生态功能中占有重要地位,AOA比AOB与硝化势的关系更为密切.
Microbial diversity and nitrification potential of sloping land red soil under different land use patterns
Soil microbial community plays a crucial role in ecological sustainability in response to different land use patterns. In this paper, soil samples were collected from the cropland, natural ly restored forestland, and tea garden on the red soil sloping land at the Taoyuan Agro-ecosystem Research Station (110·72″E, 28°52″N) under Chinese Academy of Sciences to study the effects of different land use patterns on the soil microbial diversity and nitrification potential. T-RFLP technique was adopted to study the diversity of bacteria, ammonia-oxidizing bacteria ( AOB) , and ammonia-oxidizing archaea ( AOA) , and aerobic culture method was used to study the nitrification potential. Under the three land use patterns, the diversity index of soil bacteria, AOB, and AOA showed the same variation trend, i. e. , cropland = tea garden > naturally restored for est land ( P<0. 05 ) . RDA analysis showed that the variations of soil physical and chemical properties under different land use patterns determined the community structure of soil AOB and AOA. Cropland soil had the highest nitrification potential, followed by tea garden soil, and naturally restored forestland soil. There was a significant positive correlation between the diversity index of soil bacteria, AOB , and AOA and the soil potential nitrification rate , especially for AOA, suggesting that AOA might play an important role in red soil nitrification.

bacteriaarchaeaammonia-oxidizing bacteria ( AOB)ammonia-oxidizing archaea ( AOA)T-RFLP.

张慧、袁红朝、朱亦君、陈春兰、谭周进、秦红灵

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湖南农业大学生物安全科技学院,长沙,410128

中国科学院亚热带农业生态研究所,亚热带农业生态过程重点实验室,长沙,410125

湖南中医药大学基础医学院,长沙,410208

细菌 古菌 氨氧化细菌(AOB) 氨氧化古菌(AOA) T-RFLP

国家自然科学基金

40801098

2011

生态学杂志
中国生态学学会

生态学杂志

CSTPCDCSCD北大核心
影响因子:1.439
ISSN:1000-4890
年,卷(期):2011.30(6)
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