期刊
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL
卷 71, 期 5, 页码 1579-1583出版社
SOIL SCI SOC AMER
DOI: 10.2136/sssaj2007.0095
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Nutrient enrichment may alter patterns of heterotrophic microbial activity (HMA) in wetland soils and influence organic matter decomposition dynamics. The response of the heterotrophic microbial community to C substrates (alcohols, amides, amino acids, aromatics, plant residues, and polysaccharides) was measured as CO2 and CH4 production in detritus and soil (0-10 cm) collected from P-enriched and oligotrophic areas of Water Conservation Area 2a (WCA-2a) of the Everglades. The wetland was characterized by decreasing P levels from peripheral to interior, oligotrophic areas. Denitrification and SO4 reduction appeared to be the primary metabolic pathways at the P-enriched site, whereas the contribution of methanogenesis to organic matter decomposition was greater in the oligotrophic interior of the wetland. Methane production averaged 38 and 48% of the total CO2 + CH4 production for P-enriched and oligotrophic detritus, respectively. Basal CO2 production of detritus was 36% higher at the P-enriched than the oligotrophic site, but CH4 production was 43% greater at the oligotrophic site. All C substrates enhanced CO2 and CH4 production, indicating that labile organic C may be limiting in this wetland, and the types of C substrates used by the heterotrophic microbial community varied between P-enriched and oligotrophic sites. Substrate-induced respiration was 71 and 48% greater at the P-enriched than the oligotrophic site for detritus and soil, respectively. Nutrient loading, particularly P promoted the development of a N-limited system near the periphery of the wetland, while the oligotrophic interior was characterized by P-limited conditions. Continued nutrient loading into oligotrophic areas of WCA-2a may enhance HMA and stimulate organic matter decomposition and nutrient regeneration, and further contribute to undesirable changes to the Everglades ecosystem.
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