Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Fate of microbial residues in sandy soils of the South African Highveld as influenced by prolonged arable cropping
Autor Amelung, W.; Lobe, I.; Du Preez, C.C.;
Journal / Serie European Journal of Soil Science
Erscheinungsjahr 2002
Department FLOEK;
Band/Volume 53
Heft 1
Sprache englisch;
Abstract Long-term cultivation of former grassland soils results in a significant decline of both living and dead microbial biomass. We evaluated the effect of duration of cropping on the preservation of fungal and bacterial residues in the coarse-textured soils of the South African Highveld. Composite samples were taken from the top 20 cm of soils (Plinthustalfs) that have been cropped for periods varying from 0 to 98 years in each of three different agro-ecosystems in the Free State Province. Amino sugars were determined as markers for the microbial residues in bulk soil and its particle-size fractions. Long-term cultivation reduced N in the soil by 55% and the contents of amino sugars by 60%. Loss rates of amino sugars followed bi-exponential functions, suggesting that they comprised both labile and stable fractions. With increased duration of cropping the amino sugars attached to silt dissipated faster than those associated with the clay. This dissipation was in part because silt was preferentially lost through erosion, while clay particles (and their associated microbial residues) remained. Erosion was not solely responsible for the reduction in amino sugar concentrations, however. Bacterial amino sugars were lost in preference to fungal ones as a result of cultivation, and this effect was evident in both silt- and clay-sized separates. This shift from fungal to bacterial residues was most pronounced within the first 20 years after converting the native grassland to arable cropland, but continued after 98 years of cultivation.
ID 5322
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=5322
Amelung, W., Lobe, I., Du Preez, C.C. (2002):
Fate of microbial residues in sandy soils of the South African Highveld as influenced by prolonged arable cropping
Eur. J. Soil Sci. 53 (1), 29 - 35