Effects of Inorganic Nutrients on Microbial Leaf Decomposition and Mitigation of Chemical Perturbation
作者:
JamesF. Fairchild,
TerenceP. Boyle,
Everett Robinson-Wilson,
JohnR. Jones,
期刊:
Journal of Freshwater Ecology
(Taylor Available online 1984)
卷期:
Volume 2,
issue 4
页码: 405-416
ISSN:0270-5060
年代: 1984
DOI:10.1080/02705060.1984.9664618
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A laboratory study was conducted to determine (1) the effects of inorganic nitrogen and phosphorus enrichment on microbial leaf processing, and (2) whether inorganic nutrient enrichment would mitigate the effects of chemical perturbation of microbial leaf processing. Pre-leached disks from leaves ofAcer saccharumwere incubated in flasks of unfiltered stream water at 20°C for 56 days. Treatments consisted of a control, killed control (100.0 mg/1 HgCl2), nitrogen (3.0 mg/1 NO3-N), phosphorus (0.1 mg/1 PO4-P), nitrogen + phosphorus (3.0 mg/1 NO3-N + 0.1 mg/1 PO4-P), pentachlorophenol (10.0 mg/1 Na-salt of pentachlorophenol), and pentachlorophenol + nitrogen + phosphorus (10.0 mg/1 Na-salt of pentachlorophenol t 3.0 mg/1 NO3-N + 0.1 mg/1 PO4-P). Leaf disks in the control treatment lost 31% of ash-free dry weight in 56 days. Leaf decomposition, microbial biomass, and microbial activity increased in all treatments enriched with nitrogen. However, there were no increases in the treatment receiving only phosphorus. This implied that microbial leaf processing in certain aquatic systems may be nitrogen limited. Chemical perturbation by pentachlorophenol significantly reduced biomass and activity of microbes associated with leaves. However, nitrogen + phosphorus enrichment mitigated the effects of chemical perturbation.
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