Chemical nature of organic phosphorus in cultivated and uncultivated soils under different environmental conditions
作者:
L. M. CONDRON,
E. FROSSARD,
H. TIESSEN,
R. H. NEWMANS,
J. W. B. STEWART,
期刊:
Journal of Soil Science
(WILEY Available online 1990)
卷期:
Volume 41,
issue 1
页码: 41-50
ISSN:0022-4588
年代: 1990
DOI:10.1111/j.1365-2389.1990.tb00043.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
SUMMARYA sequential alkali extraction procedure followed by ultrafiltration and quantitative31P nuclear magnetic resonance (NMR) spectroscopy was used to examine organic phosphorus in a Brown Chernozem, and an adjacent Gleysol developed under native prairie vegetation, and a Grey Luvisol formed under aspen forest in Saskatchewan, Canada. Differences in the nature of organic P in the native soils were related to moisture status and vegetation. In the grassland soils, a greater proportion of orthophosphate diester P was found in the bottom‐slope Gleysol. This difference was partly attributed to less favourable conditions for mineralization in the bottom slope soil compared with the mid‐slope Brown Chernozem. Teichoic acid P occurred only in the native Grey Luvisol (NMR δ p.p.m. 0.36‐0.95) under boreal forest and not under native grassland. At all three sites, soils under long‐term cultivation were also examined and while orthophosphate monoester P (83.4‐94.6% total Po), orthophosphate diester P (3.9–8.7% total Po) and teichoic acid P (12.7% total Po in forested Grey Luvisol) were detected in native soils, only orthophosphate monoester P was found in the corresponding soils that had been cultivated for 70–80 years. These findings suggest that orthophosphate diester P and teichoic acid P are more readily mineralized in the soil environment than orthophosphate mon
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