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Markbiologisk uppföljning i åkermark

en undersökning av fosfolipidfettsyror (PLFA) som möjlig mikrobiologisk indikator

Börjesson, Gunnar and Menichetti, Lorenzo and Kätterer, Thomas (2010). Markbiologisk uppföljning i åkermark. Technical Report. Uppsala: (NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
, Sveriges lantbruksuniversitet. Rapport (Sveriges lantbruksuniversitet, Institutionen för mark och miljö) ; 7

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Monitoring and assessment of agricultural soils has become requested as means to detect changes in soil quality. Among possible microbial indicators for monitoring soil quality, the most common methods include microbial biomass, respiration, N mineralization and a community profiling method. Among the latter, the most used seem to be DGGE (denaturing gradient gel electrophoresis), PLFA (phospholipid fatty acids), and CLPP (community level physiology profile) analyses. Here we report results from an investigation of the PLFA analysis for the possible use as an indicator for monitoring soil quality. Soil samples were taken 2009 in the Ultuna soil organic matter field experi-ment, which was started in 1956 for investigating the long-term effect of mineral N fertilizers and different organic amendments on crop yields, soil organic matter changes and soil physical properties. PLFAs were extracted from top- and subsoils in ten treatments. PLFA concentrations were compared to other variables, such as total carbon, total nitrogen, pH and respiration, but also to other results reported earlier from the same experiment. Total PLFAs in topsoil samples (0-20 cm) were highest in the sewage sludge (O) treatment, which was almost reflected in subsoil samples, although the highest mean value among those samples was found for the farmyard manure (J) treatment. A good correlation was observed between total PLFAs in topsoil samples and total carbon, but total PLFAs were even better correlated with total nitrogen (r=0.81; p<0.0001). Subsoil samples (27-40 cm depth) reflected topsoil samples for total PLFAs, but the individual PLFAs revealed that the composition of the microbial communities were entirely different. The presence of cyclic fatty acids in the sewage sludge treatment indicated some kind of stress for gram-negative bacteria, probably caused by heavy metals, although a negative effect of the sewage sludge application could not be seen in other ways, e.g. crop yield. In conclusion, the PLFA analysis can give valuable information about the microbial community in soil samples. It can be used in a monitoring programme, although the recommendation is that it would be preferable to combine the PLFA analysis with other methods, for example CLPP, in order to determine trends and changes of microbial communities and activities in soils.

Authors/Creators:Börjesson, Gunnar and Menichetti, Lorenzo and Kätterer, Thomas
Title:Markbiologisk uppföljning i åkermark
Subtitle:en undersökning av fosfolipidfettsyror (PLFA) som möjlig mikrobiologisk indikator
Series Name/Journal:Rapport (Sveriges lantbruksuniversitet, Institutionen för mark och miljö)
Year of publishing :2010
Number of Pages:34
Place of Publication:Uppsala
Publisher:Institutionen för mark och miljö, Sveriges lantbruksuniversitet
ISBN for printed version:978-91-576-9010-4
Publication Type:Report
Full Text Status:Public
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Soil science > Soil biology
Keywords:PLFA, markmikroorganismer, långliggande försök , fortlöpande miljöanalys, RAM-56, organiska gödselmedel, rötslam
Permanent URL:
ID Code:5518
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: Gunnar Börjesson
Deposited On:06 Dec 2010 00:00
Metadata Last Modified:02 Dec 2014 10:41

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