Long-term effects of sewage sludge and inorganic fertilizers on nutrient turnover in litter in a coastal Douglas fir forest
Identifieur interne : 004343 ( Main/Exploration ); précédent : 004342; suivant : 004344Long-term effects of sewage sludge and inorganic fertilizers on nutrient turnover in litter in a coastal Douglas fir forest
Auteurs : C. E. Prescott [Canada] ; M. A. Mcdonald [Canada] ; S. P. Gessel [États-Unis] ; J. P. Kimmins [Canada]Source :
- Forest Ecology and Management [ 0378-1127 ] ; 1993.
Abstract
Rates of litter input, decomposition, net N mineralization, and N and P supply on the forest floor were measured in a 70-year-old stand of Pseudotsuga menziesii (Mirb.) Franco on a poor site in western Washington, approximately 10 years after applications of sewage sludge and inorganic fertilizers. Sewage sludge was applied to three plots at the rate of 6000 kg N ha−1, and nitrogenous fertilizers were applied to two plots at rates of 1082 and 1568 kg N ha−1. The rate of each process in each treated plot was compared with that in an adjacent control plot. Amounts of N returned in needle litter during 1 year were greater on sludged and fertilized plots relative to adjacent control plots. Decomposition of a standard needle litter was the same on all plots after a 2-year in situ incubation. Rates of net N mineralization during aerobic incubations of forest floor material were similar in all plots in field incubations, but smaller rates were measured in material from sludged plots in laboratory incubations. Greenhouse bioassays with Douglas fir and Sitka spruce (Picea sitchensis (Bong.) Carr.) seedlings showed greater P supply in forest floor material from sludged plots, but no differences in N supply between any treatments. Turnover of N in litter was not different 10 years after fertilization of this forest with sewage sludge or N fertilizer. There was evidence of long-term enhancement of P turnover in litter in plots treated with sewage sludge.
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DOI: 10.1016/0378-1127(93)90076-Y
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E." last="Prescott">C. E. Prescott</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Faculty of Forestry, University of British Columbia, Vancouver, BC V6T 1Z4</wicri:regionArea><wicri:noRegion>BC V6T 1Z4</wicri:noRegion></affiliation></author><author><name sortKey="Mcdonald, M A" sort="Mcdonald, M A" uniqKey="Mcdonald M" first="M. A." last="Mcdonald">M. A. Mcdonald</name><affiliation wicri:level="1"><country xml:lang="fr">Canada</country><wicri:regionArea>Faculty of Forestry, University of British Columbia, Vancouver, BC V6T 1Z4</wicri:regionArea><wicri:noRegion>BC V6T 1Z4</wicri:noRegion></affiliation></author><author><name sortKey="Gessel, S P" sort="Gessel, S P" uniqKey="Gessel S" first="S. P." last="Gessel">S. P. 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Franco on a poor site in western Washington, approximately 10 years after applications of sewage sludge and inorganic fertilizers. Sewage sludge was applied to three plots at the rate of 6000 kg N ha−1, and nitrogenous fertilizers were applied to two plots at rates of 1082 and 1568 kg N ha−1. The rate of each process in each treated plot was compared with that in an adjacent control plot. Amounts of N returned in needle litter during 1 year were greater on sludged and fertilized plots relative to adjacent control plots. Decomposition of a standard needle litter was the same on all plots after a 2-year in situ incubation. Rates of net N mineralization during aerobic incubations of forest floor material were similar in all plots in field incubations, but smaller rates were measured in material from sludged plots in laboratory incubations. Greenhouse bioassays with Douglas fir and Sitka spruce (Picea sitchensis (Bong.) Carr.) seedlings showed greater P supply in forest floor material from sludged plots, but no differences in N supply between any treatments. Turnover of N in litter was not different 10 years after fertilization of this forest with sewage sludge or N fertilizer. There was evidence of long-term enhancement of P turnover in litter in plots treated with sewage sludge.</div></front></TEI><affiliations><list><country><li>Canada</li><li>États-Unis</li></country><region><li>Washington (État)</li></region><settlement><li>Seattle</li></settlement><orgName><li>Université de Washington</li></orgName></list><tree><country name="Canada"><noRegion><name sortKey="Prescott, C E" sort="Prescott, C E" uniqKey="Prescott C" first="C. E." last="Prescott">C. E. Prescott</name></noRegion><name sortKey="Kimmins, J P" sort="Kimmins, J P" uniqKey="Kimmins J" first="J. P." last="Kimmins">J. P. Kimmins</name><name sortKey="Mcdonald, M A" sort="Mcdonald, M A" uniqKey="Mcdonald M" first="M. A." last="Mcdonald">M. A. Mcdonald</name></country><country name="États-Unis"><region name="Washington (État)"><name sortKey="Gessel, S P" sort="Gessel, S P" uniqKey="Gessel S" first="S. P." last="Gessel">S. P. Gessel</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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