Soil organic sulfur mineralization in the presence of growing plants underaerobic or waterlogged conditions

Citation
St. Li et al., Soil organic sulfur mineralization in the presence of growing plants underaerobic or waterlogged conditions, SOIL BIOL B, 33(6), 2001, pp. 721-727
Citations number
35
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
SOIL BIOLOGY & BIOCHEMISTRY
ISSN journal
0038-0717 → ACNP
Volume
33
Issue
6
Year of publication
2001
Pages
721 - 727
Database
ISI
SICI code
0038-0717(200105)33:6<721:SOSMIT>2.0.ZU;2-3
Abstract
Pot culture experiments are described which attempt to identify soil organi c S mineralization and availability to plants under aerobic or waterlogged conditions. Several organic S fractions were determined using existing frac tionation techniques before and after the growth of corn (Zea mays L.) or r ice (Oryza sativa L.) seedlings for four successive harvests. Net mineraliz ation occurred in organic S fractions including hydriodic acid-reducible S, Raney-nickel reducible S and non-reducible S and all fractions decreased g radually during plant growth and decreased more in the first two harvests. The amount of S mineralized from organic S during rice growth under waterlo gged conditions was more than that during corn growth under aerobic conditi ons and this contributed to the greater amount of S taken up by rice seedli ngs. On average for the four soils tested, 70 and 82% of S taken up by four harvests of corn and rice seedlings, respectively, was derived from organi c S calculated by the difference between the S uptake by plant and the decr eased amount of inorganic sulfate in soils. All of the S fractions investig ated contributed available S for plant uptake under either aerobic or water logged conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.