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5 results for “peat deposits”
Phospholipid Fatty Acid Profiles of Bacteria and Fungi in Peat Exposed to Experimentally Increased N Deposition, 2015
Development of the oil sands has led to increasing atmospheric N deposition, with values as high as 17 kg N ha-1 yr-1; regional background levels <2 kg N ha-1 yr-1. Bogs, being ombrotrophic, may be especially susceptible to increasing N deposition. To examine responses to N deposition, over five years, we experimentally applied N (as NH4NO3) to a bog near Mariana Lakes, Alberta, at rates of 0, 5, 10, 15, 20, and 25 kg N ha-1 yr-1, plus controls (no water or N addition). In July of 2015 we measured PLFA markers in two depths in each plot. For the most part, microbial group abundances were not affected by increasing N input (Fig. 16). However, actinomycete abundance decreased with increasing N deposition at rates that were similar in 0-5 and 5-10 cm peat. Gram-negative bacteria increased slightly with increasing N input and were more abundant in 0-5 cm than in 5-10 cm peat; correspondingly the Gram-positive to Gram-negative bacterial ratio decreased with increasing N input and was lower in 0-5 cm than in 5-10 cm peat. Total microbial abundance and total bacterial abundance were significantly higher in 0-5 cm peat than in 5-10 cm peat. It may be that more sensitive/targeted techniques, such as high-throughput pyrosequencing, 16s RNA clone library analysis and rRNA-targeted fluorescence in situ hybridization (FISH) or whole genome shotgun sequencing may be required to reveal bog microbial community responses to N loading.
Phospholipid Fatty Acid Profiles of Bacteria and Fungi in Poor Fen Peat Exposed to Experimentally Increased N Deposition, 2015
Development of the oil sands has led to increasing atmospheric N deposition, with values as high as 17 kg N ha-1 yr-1; regional background levels <2 kg N ha-1 yr-1. To examine responses to N deposition, over five years, we experimentally applied N (as NH4NO3) to a poor fen near Mariana Lake, Alberta, at rates of 0, 5, 10, 15, 20, and 25 kg N ha-1 yr-1, plus controls (no water or N addition). In July of 2015 we measured PLFA markers in two depths in each plot. Fungal abundance increased at N addition levels above 16.6 kg N ha-1 yr-1 and total bacterial abundance also increased at N addition levels above 17.1 kg N ha-1 yr-1, such that the fungal:bacterial ratio was not significantly affected by N addition. Total microbial, gram-negative bacterial, and actinomycete abundance also showed an apparent threshold responses to N addition at 16-17 kg N ha-1 yr-1 addition levels.It may be that more sensitive/targeted techniques, such as high-throughput pyrosequencing, 16s RNA clone library analysis and rRNA-targeted fluorescence in situ hybridization (FISH) or whole genome shotgun sequencing may be required to reveal detailed fen microbial community responses to N loading.
Leaf wax δD record from the Shuizhuyang (SZY) peat deposit in Southeast China
<p>In May 2018, a 2.73-m-long peat core (abbr. SZY18; 26°46′27″N, 119°2′41″E; 990 m above sea level; Figure 1 and S1) was collected from the SZY peat deposit and sliced at 1 cm interval in the field. The lithology of the SZY18 core is as below: 0-30 cm: cultivated soil; 30-195 cm: brown-black peat with visible plant debris; 195-200 cm: gray black peat; 200-220 cm: light brown black peat and 220-273 cm: brown-black to gray black peat.</p>
Leaf wax data from the Yanjiang peat deposit in Southwest China
<p>The peat sequence was retrieved from the Yanjiang peatland in May 2019. The topmost 8 cm is mainly composed of abundant plant debris. The layer of 8-50 cm consists of brown-black peat. The underlined layer of 50-74 cm is dark brown peat. It transitions to brown-black peat from 74 to 120 cm.</p>
Data from: Middle Bronze Age land use practices in the north-western Alpine foreland – A multi-proxy study of colluvial deposits, archaeological features and peat bogs
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