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Dynamic of different C and N fractions in a Cambisol under five year succession fallow in Saxony (Germany)
Author(s) -
Landgraf Dirk,
Böhm Christian,
Makeschin Franz
Publication year - 2003
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/jpln.200390049
Subject(s) - cambisol , chemistry , zoology , analytical chemistry (journal) , soil water , mineralogy , environmental chemistry , soil science , geology , biology
The dynamic of different soil C and N fractions in a Cambisol under succession fallow was investigated from June 1996 until May 2001. Mineral soil samples (0 – 10 and 10 – 30 cm) were analyzed for their concentrations of organic C (C org ), total N (N t ), hot water extractable C and N (HWC and HWN), and KCl extractable C and N (C org(KCl), N org(KCl) , NH 4 + ‐N, NO 3 – ‐N). The values of all C and N fractions revealed a distinct depth gradient. While the concentrations of C org increased after set aside significantly from 7.7 to 8.9 g kg –1 at 0 – 10 cm, those at 10 – 30 cm depth decreased from 7.2 to 6.1 g kg –1 . N t remained rather constant throughout the whole observation period. The HWC concentrations increased from 0.33 to 0.49 g kg –1 , while HWN decreased slightly at 0 – 10 cm with time. In contrast, both HWC and HWN increased at 10 – 30 cm soil depth. HWC showed close significant correlations to C org , and HWN to N t as well as to NH 4 + ‐N and NO 3 – ‐N, respectively. In comparison to hot water‐extractable C and N, C org(KCl) and N org(KCl) accounted only about one tenth of those and showed a decreasing trend with time of succession. C : N ratio of the KCl fraction was in the same order of magnitude as the HWC : HWN ratio, except the last phase of the experiment where hot water extract values increased above 10.