Open AccessSeasonal variations in the diversity and abundance of diazotrophic communities across soils
Author(s) -
Pereira e Silva Michele C.,
Semenov Alexander V.,
van Elsas Jan Dirk,
Salles Joana Falcão
Publication year - 2011
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.2011.01081.x
Subject(s) - soil water , biology , diazotroph , abiotic component , ecology , community structure , abundance (ecology) , soil texture , relative species abundance , species richness , soil ph , agronomy , nitrogen fixation , genetics , bacteria
The nitrogen (N)‐fixing community is a key functional community in soil, as it replenishes the pool of biologically available N that is lost to the atmosphere via anaerobic ammonium oxidation and denitrification. We characterized the structure and dynamic changes in diazotrophic communities, based on the nif H gene, across eight different representative Dutch soils during one complete growing season, to evaluate the amplitude of the natural variation in abundance and diversity, and identify possible relationships with abiotic factors. Overall, our results indicate that soil type is the main factor influencing the N‐fixing communities, which were more abundant and diverse in the clay soils ( n =4) than in the sandy soils ( n =4). On average, the amplitude of variation in community size as well as the range‐weighted richness were also found to be higher in the clay soils. These results indicate that N‐fixing communities associated with sandy and clay soil show a distinct amplitude of variation under field conditions, and suggest that the diazotrophic communities associated with clay soil might be more sensitive to fluctuations associated with the season and agricultural practices. Moreover, soil characteristics such as ammonium content, pH and texture most strongly correlated with the variations observed in the diversity, size and structure of N‐fixing communities, whose relative importance was determined across a temporal and spatial scale.