Changes in bacterial communities and Azospirillum diversity in soil fractions of a tropical soil under 3 or 19 years of natural fallow
The effects of 3 and 19 yr natural fallows on soil structure and soil bacteria were assessed by aggregate size fractionation of a tropical sandy soil (0–10 cm). Bulk unfractionated soil and fractions including particulate coarse organic residues (COR), and four fractions (>2000, 50–2000, 2–50 and...
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| Veröffentlicht in: | Soil biology & biochemistry 2002-08, Vol.34 (8), p.1083-1092 |
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| container_title | Soil biology & biochemistry |
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| creator | Chotte, Jean-Luc Schwartzmann, Alexia Bally, René Jocteur Monrozier, Lucile |
| description | The effects of 3 and 19
yr natural fallows on soil structure and soil bacteria were assessed by aggregate size fractionation of a tropical sandy soil (0–10
cm). Bulk unfractionated soil and fractions including particulate coarse organic residues (COR), and four fractions (>2000, 50–2000, 2–50 and 50
μm), suggesting that these microhabitats were favourable to active N
2 fixers. In contrast, more than 70% of the N
2 fixing microorganisms and 90% of the recovered
Azospirillum were isolated from the dispersible clay fraction (0–2
μm). Diversity of
Azospirillum species was assessed by hybridisation with specific genetic probes on colonies within each fraction. This approach revealed the abundance of
Azospirillum irakense in the 3
yr fallow soil fractions only and a selective effect of fallow on
Azospirillum brasilense/
Azospirillum amazonense genomic species in the 19
yr fallow soil. These changes would remain hidden, if the investigation had been restricted to the unfractionated soil. |
| doi_str_mv | 10.1016/S0038-0717(02)00041-X |
| format | Article |
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yr natural fallows on soil structure and soil bacteria were assessed by aggregate size fractionation of a tropical sandy soil (0–10
cm). Bulk unfractionated soil and fractions including particulate coarse organic residues (COR), and four fractions (>2000, 50–2000, 2–50 and <2
μm) from each treatment were analysed for total heterotrophic bacteria, free N-fixers and the diversity of
Azospirillum species. The potential N
2 fixation (acetylene reduction activity, ARA) was also measured using unfractionated soil and soil fractions. Long-term fallow (19
yr) under
Pennisetum was found to stimulate aggregation, while all clay particles were easily dispersed from the 3
yr fallow soil. Hot spots of potential N
2 fixation were observed in coarse soil fractions (>50
μm), suggesting that these microhabitats were favourable to active N
2 fixers. In contrast, more than 70% of the N
2 fixing microorganisms and 90% of the recovered
Azospirillum were isolated from the dispersible clay fraction (0–2
μm). Diversity of
Azospirillum species was assessed by hybridisation with specific genetic probes on colonies within each fraction. This approach revealed the abundance of
Azospirillum irakense in the 3
yr fallow soil fractions only and a selective effect of fallow on
Azospirillum brasilense/
Azospirillum amazonense genomic species in the 19
yr fallow soil. These changes would remain hidden, if the investigation had been restricted to the unfractionated soil.</description><identifier>ISSN: 0038-0717</identifier><identifier>EISSN: 1879-3428</identifier><identifier>DOI: 10.1016/S0038-0717(02)00041-X</identifier><identifier>CODEN: SBIOAH</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Aggregate-size fractionation ; Agronomy. Soil science and plant productions ; Azospirillum diversity ; Biochemistry and biology ; Biological and medical sciences ; Chemical, physicochemical, biochemical and biological properties ; Economic plant physiology ; Fallow ; Fundamental and applied biological sciences. Psychology ; Microbiology ; N 2 fixation ; Physics, chemistry, biochemistry and biology of agricultural and forest soils ; Soil science ; Soil structure ; Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)</subject><ispartof>Soil biology & biochemistry, 2002-08, Vol.34 (8), p.1083-1092</ispartof><rights>2002 Elsevier Science Ltd</rights><rights>2002 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/S0038-0717(02)00041-X$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=13781199$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Chotte, Jean-Luc</creatorcontrib><creatorcontrib>Schwartzmann, Alexia</creatorcontrib><creatorcontrib>Bally, René</creatorcontrib><creatorcontrib>Jocteur Monrozier, Lucile</creatorcontrib><title>Changes in bacterial communities and Azospirillum diversity in soil fractions of a tropical soil under 3 or 19 years of natural fallow</title><title>Soil biology & biochemistry</title><description>The effects of 3 and 19
yr natural fallows on soil structure and soil bacteria were assessed by aggregate size fractionation of a tropical sandy soil (0–10
cm). Bulk unfractionated soil and fractions including particulate coarse organic residues (COR), and four fractions (>2000, 50–2000, 2–50 and <2
μm) from each treatment were analysed for total heterotrophic bacteria, free N-fixers and the diversity of
Azospirillum species. The potential N
2 fixation (acetylene reduction activity, ARA) was also measured using unfractionated soil and soil fractions. Long-term fallow (19
yr) under
Pennisetum was found to stimulate aggregation, while all clay particles were easily dispersed from the 3
yr fallow soil. Hot spots of potential N
2 fixation were observed in coarse soil fractions (>50
μm), suggesting that these microhabitats were favourable to active N
2 fixers. In contrast, more than 70% of the N
2 fixing microorganisms and 90% of the recovered
Azospirillum were isolated from the dispersible clay fraction (0–2
μm). Diversity of
Azospirillum species was assessed by hybridisation with specific genetic probes on colonies within each fraction. This approach revealed the abundance of
Azospirillum irakense in the 3
yr fallow soil fractions only and a selective effect of fallow on
Azospirillum brasilense/
Azospirillum amazonense genomic species in the 19
yr fallow soil. These changes would remain hidden, if the investigation had been restricted to the unfractionated soil.</description><subject>Aggregate-size fractionation</subject><subject>Agronomy. Soil science and plant productions</subject><subject>Azospirillum diversity</subject><subject>Biochemistry and biology</subject><subject>Biological and medical sciences</subject><subject>Chemical, physicochemical, biochemical and biological properties</subject><subject>Economic plant physiology</subject><subject>Fallow</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Microbiology</subject><subject>N 2 fixation</subject><subject>Physics, chemistry, biochemistry and biology of agricultural and forest soils</subject><subject>Soil science</subject><subject>Soil structure</subject><subject>Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)</subject><issn>0038-0717</issn><issn>1879-3428</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNo9kUFv1DAQhS1EJZaFn4DkCwgOAU-cxPEJVatCK1Xi0CL1Zjn2BAYl9mInRdsfwO_Gu604zUjzvad5eoy9AfERBHSfboSQfSUUqPei_iCEaKC6e8Y20Ctdyabun7PNf-QFe5nzrwLVLcgN-7v7acMPzJwCH6xbMJGduIvzvAZaqBxs8Pz8IeY9JZqmdeae7jFlWg5HTY408TEVJcWQeRy55UuKe3LF5nRcg8fEJY-Jg-YHtOmEBbusqTCjnab45xU7K0vG109zy75_ubjdXVbX375e7c6vK6yVWKpGyXaA1nuJrhl1B32rUTqJY699ryV2CIPqnOtGNXbN0A6IrVYSmsY7UF5u2btH332Kv1fMi5kpO5wmGzCu2UDf1RKKYsvePoE2lyglYXCUzT7RbNPBgFQ9gNaF-_zIYfn6njCZ7AiDQ08J3WJ8JAPCHHsyp57MsQQjanPqydzJfzF0iIE</recordid><startdate>20020801</startdate><enddate>20020801</enddate><creator>Chotte, Jean-Luc</creator><creator>Schwartzmann, Alexia</creator><creator>Bally, René</creator><creator>Jocteur Monrozier, Lucile</creator><general>Elsevier Ltd</general><general>Elsevier Science</general><scope>IQODW</scope><scope>7SN</scope><scope>7T7</scope><scope>8FD</scope><scope>C1K</scope><scope>FR3</scope><scope>P64</scope></search><sort><creationdate>20020801</creationdate><title>Changes in bacterial communities and Azospirillum diversity in soil fractions of a tropical soil under 3 or 19 years of natural fallow</title><author>Chotte, Jean-Luc ; Schwartzmann, Alexia ; Bally, René ; Jocteur Monrozier, Lucile</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-e270t-4735b15dd3ec4f961859e3c3ef89d893e6e1b76cc6f7f64b5bee5973144dc17d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Aggregate-size fractionation</topic><topic>Agronomy. Soil science and plant productions</topic><topic>Azospirillum diversity</topic><topic>Biochemistry and biology</topic><topic>Biological and medical sciences</topic><topic>Chemical, physicochemical, biochemical and biological properties</topic><topic>Economic plant physiology</topic><topic>Fallow</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>Microbiology</topic><topic>N 2 fixation</topic><topic>Physics, chemistry, biochemistry and biology of agricultural and forest soils</topic><topic>Soil science</topic><topic>Soil structure</topic><topic>Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Chotte, Jean-Luc</creatorcontrib><creatorcontrib>Schwartzmann, Alexia</creatorcontrib><creatorcontrib>Bally, René</creatorcontrib><creatorcontrib>Jocteur Monrozier, Lucile</creatorcontrib><collection>Pascal-Francis</collection><collection>Ecology Abstracts</collection><collection>Industrial and Applied Microbiology Abstracts (Microbiology A)</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Engineering Research Database</collection><collection>Biotechnology and BioEngineering Abstracts</collection><jtitle>Soil biology & biochemistry</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Chotte, Jean-Luc</au><au>Schwartzmann, Alexia</au><au>Bally, René</au><au>Jocteur Monrozier, Lucile</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Changes in bacterial communities and Azospirillum diversity in soil fractions of a tropical soil under 3 or 19 years of natural fallow</atitle><jtitle>Soil biology & biochemistry</jtitle><date>2002-08-01</date><risdate>2002</risdate><volume>34</volume><issue>8</issue><spage>1083</spage><epage>1092</epage><pages>1083-1092</pages><issn>0038-0717</issn><eissn>1879-3428</eissn><coden>SBIOAH</coden><abstract>The effects of 3 and 19
yr natural fallows on soil structure and soil bacteria were assessed by aggregate size fractionation of a tropical sandy soil (0–10
cm). Bulk unfractionated soil and fractions including particulate coarse organic residues (COR), and four fractions (>2000, 50–2000, 2–50 and <2
μm) from each treatment were analysed for total heterotrophic bacteria, free N-fixers and the diversity of
Azospirillum species. The potential N
2 fixation (acetylene reduction activity, ARA) was also measured using unfractionated soil and soil fractions. Long-term fallow (19
yr) under
Pennisetum was found to stimulate aggregation, while all clay particles were easily dispersed from the 3
yr fallow soil. Hot spots of potential N
2 fixation were observed in coarse soil fractions (>50
μm), suggesting that these microhabitats were favourable to active N
2 fixers. In contrast, more than 70% of the N
2 fixing microorganisms and 90% of the recovered
Azospirillum were isolated from the dispersible clay fraction (0–2
μm). Diversity of
Azospirillum species was assessed by hybridisation with specific genetic probes on colonies within each fraction. This approach revealed the abundance of
Azospirillum irakense in the 3
yr fallow soil fractions only and a selective effect of fallow on
Azospirillum brasilense/
Azospirillum amazonense genomic species in the 19
yr fallow soil. These changes would remain hidden, if the investigation had been restricted to the unfractionated soil.</abstract><cop>Oxford</cop><cop>New York, NY</cop><pub>Elsevier Ltd</pub><doi>10.1016/S0038-0717(02)00041-X</doi><tpages>10</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0038-0717 |
| ispartof | Soil biology & biochemistry, 2002-08, Vol.34 (8), p.1083-1092 |
| issn | 0038-0717 1879-3428 |
| language | eng |
| recordid | cdi_proquest_miscellaneous_18623197 |
| source | Elsevier ScienceDirect Journals Complete |
| subjects | Aggregate-size fractionation Agronomy. Soil science and plant productions Azospirillum diversity Biochemistry and biology Biological and medical sciences Chemical, physicochemical, biochemical and biological properties Economic plant physiology Fallow Fundamental and applied biological sciences. Psychology Microbiology N 2 fixation Physics, chemistry, biochemistry and biology of agricultural and forest soils Soil science Soil structure Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...) |
| title | Changes in bacterial communities and Azospirillum diversity in soil fractions of a tropical soil under 3 or 19 years of natural fallow |
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