Does repeated wetting and drying accelerate decay of leaf litter?
Identifieur interne : 004B90 ( Main/Exploration ); précédent : 004B89; suivant : 004B91Does repeated wetting and drying accelerate decay of leaf litter?
Auteurs : Barry R. Taylor [Canada] ; Dennis Parkinso [Canada]Source :
- Soil Biology and Biochemistry [ 0038-0717 ] ; 1988.
Abstract
Needle litter of lodgepole-jack pine (Pinus contorta Loud. × P. banksiana Lamb.) previously wetted and dried 14 times absorbed water faster than needles wetted only once for the same total duration (controls); trembling aspen (Populus tremuloides Michx.) leaf litter showed the reverse response. Wetting-drying did not enhance leaching in either species. Aspen litter decaying in laboratory microcosms at 26°C decomposed faster than controls for 1 month if wetted and dried either previously (14 times) or while decomposition proceeded. However the difference was not maintained past 2 or 3 months decay. Accelerated water absorption by treatment leaves accounted for some, but not all, of the difference in decay rates. Similarly treated pine needles showed a slightly greater mass loss after 1 month, but no consistent difference after 2 or 3 months.Litter layers on the forest floor exhibited persistent trends of increasing (occasionally decreasing) moisture content with depth; only the top centimetre experienced wetting-drying cycles, and no more than 10–15 cycles yr− are likely. In these ecosystems, repeated wetting-drying is probably not a significant influence on litter decomposition rates.
Url:
DOI: 10.1016/0038-0717(88)90149-6
Affiliations:
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Taylor</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Kananaskis Centre for Environmental Research, The University of Calgary, Calgary, Alberta T2N 1N4</wicri:regionArea><orgName type="university">Université de Calgary</orgName><placeName><settlement type="city">Calgary</settlement><region type="state">Alberta</region></placeName></affiliation></author><author><name sortKey="Parkinso, Dennis" sort="Parkinso, Dennis" uniqKey="Parkinso D" first="Dennis" last="Parkinso">Dennis Parkinso</name><affiliation wicri:level="4"><country xml:lang="fr">Canada</country><wicri:regionArea>Kananaskis Centre for Environmental Research, The University of Calgary, Calgary, Alberta T2N 1N4</wicri:regionArea><orgName type="university">Université de Calgary</orgName><placeName><settlement type="city">Calgary</settlement><region type="state">Alberta</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Soil Biology and Biochemistry</title><title level="j" type="abbrev">SBB</title><idno type="ISSN">0038-0717</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1988">1988</date><biblScope unit="volume">20</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="647">647</biblScope><biblScope unit="page" to="656">656</biblScope></imprint><idno type="ISSN">0038-0717</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0038-0717</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Needle litter of lodgepole-jack pine (Pinus contorta Loud. × P. banksiana Lamb.) previously wetted and dried 14 times absorbed water faster than needles wetted only once for the same total duration (controls); trembling aspen (Populus tremuloides Michx.) leaf litter showed the reverse response. Wetting-drying did not enhance leaching in either species. Aspen litter decaying in laboratory microcosms at 26°C decomposed faster than controls for 1 month if wetted and dried either previously (14 times) or while decomposition proceeded. However the difference was not maintained past 2 or 3 months decay. Accelerated water absorption by treatment leaves accounted for some, but not all, of the difference in decay rates. Similarly treated pine needles showed a slightly greater mass loss after 1 month, but no consistent difference after 2 or 3 months.Litter layers on the forest floor exhibited persistent trends of increasing (occasionally decreasing) moisture content with depth; only the top centimetre experienced wetting-drying cycles, and no more than 10–15 cycles yr− are likely. In these ecosystems, repeated wetting-drying is probably not a significant influence on litter decomposition rates.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Alberta</li></region><settlement><li>Calgary</li></settlement><orgName><li>Université de Calgary</li></orgName></list><tree><country name="Canada"><region name="Alberta"><name sortKey="Taylor, Barry R" sort="Taylor, Barry R" uniqKey="Taylor B" first="Barry R." last="Taylor">Barry R. Taylor</name></region><name sortKey="Parkinso, Dennis" sort="Parkinso, Dennis" uniqKey="Parkinso D" first="Dennis" last="Parkinso">Dennis Parkinso</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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