CHANGES IN SOIL ORGANIC-MATTER WITH CROPPING AS MEASURED BY ORGANIC-CARBON FRACTIONS AND C-13 NATURAL ISOTOPE ABUNDANCE

Authors
LEFROY RDB BLAIR GJ STRONG WM
Citation
Rdb. Lefroy et al., CHANGES IN SOIL ORGANIC-MATTER WITH CROPPING AS MEASURED BY ORGANIC-CARBON FRACTIONS AND C-13 NATURAL ISOTOPE ABUNDANCE, Plant and soil, 156, 1993, pp. 399-402
Citations number
5
Categorie Soggetti
Agriculture Soil Science","Plant Sciences",Agriculture
Journal title
Plant and soil → ACNP
ISSN journal
0032079X
Volume
156
Year of publication
1993
Pages
399 - 402
Database
ISI
SICI code
0032-079X(1993)156:<399:CISOWC>2.0.ZU;2-C
Abstract
The decline in soil organic matter with cropping is a major factor aff ecting the sustainability of cropping systems. Changes in total C leve ls are relatively insensitive as a sustainability measure. Oxidation w ith different strength KMnO4 has been shown to be a more sensitive ind icator of change. The relative size of soil C fractions oxidised by 33 3mM KMnO4 declined with cropping, whilst the relative size of the unox idised fraction increased. Changes in delta(13)C ratio have been used to measure C turnover in systems which include C3 and C4 species.