Availability of residual 15N in a coniferous forest soil: a greenhouse bioassay and comparison with chemical extractions
Identifieur interne : 001323 ( Istex/Checkpoint ); précédent : 001322; suivant : 001324Availability of residual 15N in a coniferous forest soil: a greenhouse bioassay and comparison with chemical extractions
Auteurs : Scott X. Chang [Nouvelle-Zélande] ; Caroline M. Preston [Canada] ; Gordon F. Weetman [Canada]Source :
- Forest Ecology and Management [ 0378-1127 ] ; 1999.
Abstract
The assessment of soil N availability by chemical extraction methods often needs to be checked by methods which directly measure plant N uptake such as a greenhouse bioassay. In this paper, the recovery of residual 15N, from humus material samples with 15N labelled for 24-h, seven-month, and 31-month, in western redcedar (Thuja plicata Donn ex D. Don) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings was investigated in a 342-day greenhouse incubation study and was compared to chemical extraction studies on the same samples. Apparently higher N availability in the 24-h treatment resulted in greater shoot mass in that treatment than in the other two treatments. However, root and whole plant mass were not significantly different among treatments and there were no differences between the species in any of the above measurements. Plants in the 24-h treatment also proportionally took up more residual 15N from the humus material than those in the other two treatments and thus significantly greater availability ratios were obtained in the former than in the latter two treatments. At the end of the 342-day incubation, a significant amount of 15N had been immobilised by the soil in the 24-h treatment compared to net 15N mineralisation in the other two treatments. The high soil mineral N and 15N contents in the 24-h treatment at the end of the 342-day incubation compared to the low soil mineral N and 15N contents in the seven-month treatment at the beginning of greenhouse incubation means immobilisation of fertiliser N in the greenhouse incubation was dramatically reduced compared to field situations. Nitrification was negligible before day 182 but was detected at the end of the incubation. Correlation analysis showed that 15N released during a two-week anaerobic incubation or in a 42-day aerobic incubation, 15N extracted by 0.01M KMnO4 or 2M KCl, 15N released by autoclaving or fumigation (-extraction), and even 15N abundance in the fulvic acid fraction of the organic matter all seemed good indicators of soil residual N availability.
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DOI: 10.1016/S0378-1127(98)00464-2
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Weetman</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:4D88AB89A9B18971E68BC4B0F2CF037AD80B1AB6</idno><date when="1999" year="1999">1999</date><idno type="doi">10.1016/S0378-1127(98)00464-2</idno><idno type="url">https://api-v5.istex.fr/document/4D88AB89A9B18971E68BC4B0F2CF037AD80B1AB6/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001D49</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001D49</idno><idno type="wicri:Area/Istex/Curation">001D49</idno><idno type="wicri:Area/Istex/Checkpoint">001323</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Checkpoint">001323</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Availability of residual 15N in a coniferous forest soil: a greenhouse bioassay and comparison with chemical extractions</title><author><name sortKey="Chang, Scott X" sort="Chang, Scott X" uniqKey="Chang S" first="Scott X" last="Chang">Scott X. Chang</name><affiliation wicri:level="1"><country xml:lang="fr">Nouvelle-Zélande</country><wicri:regionArea>Soil, Plant and Ecological Sciences Division, Field Service Centre, PO Box 84, Lincoln University, Canterbury</wicri:regionArea><wicri:noRegion>Canterbury</wicri:noRegion></affiliation></author><author><name sortKey="Preston, Caroline M" sort="Preston, Caroline M" uniqKey="Preston C" first="Caroline M" last="Preston">Caroline M. Preston</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Pacific Forestry Centre, Natural Resources Canada, 506 West Burnside Road, Victoria, B.C. V8Z 1M5</wicri:regionArea><wicri:noRegion>B.C. V8Z 1M5</wicri:noRegion></affiliation></author><author><name sortKey="Weetman, Gordon F" sort="Weetman, Gordon F" uniqKey="Weetman G" first="Gordon F" last="Weetman">Gordon F. Weetman</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Forest Sciences, The University of British Columbia, Vancouver, B.C. V6T 1Z4</wicri:regionArea><wicri:noRegion>B.C. V6T 1Z4</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Forest Ecology and Management</title><title level="j" type="abbrev">FORECO</title><idno type="ISSN">0378-1127</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1999">1999</date><biblScope unit="volume">117</biblScope><biblScope unit="issue">1–3</biblScope><biblScope unit="page" from="199">199</biblScope><biblScope unit="page" to="209">209</biblScope></imprint><idno type="ISSN">0378-1127</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0378-1127</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The assessment of soil N availability by chemical extraction methods often needs to be checked by methods which directly measure plant N uptake such as a greenhouse bioassay. In this paper, the recovery of residual 15N, from humus material samples with 15N labelled for 24-h, seven-month, and 31-month, in western redcedar (Thuja plicata Donn ex D. Don) and western hemlock (Tsuga heterophylla (Raf.) Sarg.) seedlings was investigated in a 342-day greenhouse incubation study and was compared to chemical extraction studies on the same samples. Apparently higher N availability in the 24-h treatment resulted in greater shoot mass in that treatment than in the other two treatments. However, root and whole plant mass were not significantly different among treatments and there were no differences between the species in any of the above measurements. Plants in the 24-h treatment also proportionally took up more residual 15N from the humus material than those in the other two treatments and thus significantly greater availability ratios were obtained in the former than in the latter two treatments. At the end of the 342-day incubation, a significant amount of 15N had been immobilised by the soil in the 24-h treatment compared to net 15N mineralisation in the other two treatments. The high soil mineral N and 15N contents in the 24-h treatment at the end of the 342-day incubation compared to the low soil mineral N and 15N contents in the seven-month treatment at the beginning of greenhouse incubation means immobilisation of fertiliser N in the greenhouse incubation was dramatically reduced compared to field situations. Nitrification was negligible before day 182 but was detected at the end of the incubation. Correlation analysis showed that 15N released during a two-week anaerobic incubation or in a 42-day aerobic incubation, 15N extracted by 0.01M KMnO4 or 2M KCl, 15N released by autoclaving or fumigation (-extraction), and even 15N abundance in the fulvic acid fraction of the organic matter all seemed good indicators of soil residual N availability.</div></front></TEI><affiliations><list><country><li>Canada</li><li>Nouvelle-Zélande</li></country></list><tree><country name="Nouvelle-Zélande"><noRegion><name sortKey="Chang, Scott X" sort="Chang, Scott X" uniqKey="Chang S" first="Scott X" last="Chang">Scott X. Chang</name></noRegion></country><country name="Canada"><noRegion><name sortKey="Preston, Caroline M" sort="Preston, Caroline M" uniqKey="Preston C" first="Caroline M" last="Preston">Caroline M. Preston</name></noRegion><name sortKey="Weetman, Gordon F" sort="Weetman, Gordon F" uniqKey="Weetman G" first="Gordon F" last="Weetman">Gordon F. 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