NDLI: Separate effects of the biochemical quality and N content of crop residues on C and N dynamics in soil

Content Provider	Springer Nature Link
Author	Sall, S. Bertrand, I. Chotte, J. L. Recous, S.
Copyright Year	2007
Abstract	This study assessed the respective roles of biochemical quality and N content of plant residues on C and N dynamics in a soil. Both 15N- and 13C-labeled oilseed rape residues (roots, seedpod walls) combining different biochemical characteristics and similar N content or the same biochemical characteristics and different N contents were used as amendments. These treatments were combined with two levels of soil inorganic N to ensure that decomposition was not limited by N availability. The soil was incubated under laboratory conditions for 134 days. Soil amended with residues of similar biochemical quality (i.e. the two pod walls) displayed similar C mineralization dynamics when the initial N availability (residue+soil N) ranged from 1.7 to 3.2% of residue dry matter. The roots showed poorer decomposition than the pod walls, lower cumulative C mineralization and greater accumulation of root-derived C in the >50 μm coarse fraction of the soil organic matter. The N content of the residues influenced mineral N accumulation in the soil with a lower net immobilization of residues with low C-to-N ratios. Adding an exogenous source of inorganic N had no effect on C dynamics but modified the remineralization kinetics of the previously immobilized N, suggesting changes in the microbial community involved.
Starting Page	797
Ending Page	804
Page Count	8
File Format	PDF
ISSN	01782762
Journal	Biology and Fertility of Soils
Volume Number	43
Issue Number	6
e-ISSN	14320789
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-02-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	C dynamics Decomposition Plant residue quality N availability Soil Science & Conservation Agriculture
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science Microbiology

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