Uz Ilker, Ogram Andrew V
Soil and Water Science Department, University of Florida, Gainesville, FL 32611-0290, USA.
FEMS Microbiol Ecol. 2006 Sep;57(3):396-408. doi: 10.1111/j.1574-6941.2006.00120.x.
The northern Florida Everglades has been subject to eutrophication in recent years, resulting in well-documented changes in microbial ecology and a shift in the dominant plant species. This study investigated effects of plant quality and eutrophication on activities and composition of cellulolytic and fermentative guilds in soils. Most probable numbers of cellulolytic bacteria in eutrophic (F1) and transition (F4) soils were 10-fold higher than in oligotrophic soils (U3). Higher potential methanogenesis was observed from cellulose in microcosms with soils from F1 and F4, compared to U3 soils. Nutrient status of soil, rather than plant type, was the major factor controlling methanogenesis rates, although numbers of fermentative bacteria were higher in microcosms supplemented with ground cattail (dominant in F1 and F4) than with sawgrass (dominant component of soil in U3), regardless of soil origin. DNA sequence analysis indicated Clostridium assemblage composition correlates with soil nutrient status.
近年来，佛罗里达州北部的大沼泽地一直受到富营养化的影响，导致微生物生态发生了有充分记录的变化，优势植物物种也发生了转变。本研究调查了植物质量和富营养化对土壤中纤维素分解和发酵菌群的活性及组成的影响。富营养化土壤（F1）和过渡性土壤（F4）中纤维素分解细菌的最可能数量比贫营养土壤（U3）高10倍。与U3土壤相比，在含有F1和F4土壤的微观世界中，从纤维素中观察到更高的潜在甲烷生成。土壤的养分状况而非植物类型是控制甲烷生成速率的主要因素，尽管无论土壤来源如何，添加香蒲（F1和F4中的优势植物）的微观世界中发酵细菌的数量都高于添加锯齿草（U3土壤中的主要成分）的微观世界。DNA序列分析表明梭菌组合组成与土壤养分状况相关。
