期刊
EUROPEAN JOURNAL OF SOIL BIOLOGY
卷 47, 期 4, 页码 243-246出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejsobi.2011.05.001
关键词
N mineralization; Plant residues; Initial composition; Leguminous; Graminaceous
资金
- Isfahan University of Technology
Contradictory results have been obtained when soil N transformation rates have been related to initial plant residue chemistry. The objective of this study was to identify the relationship between N mineralization and initial chemical composition of 8 diverse range plant residues during a 90-day incubation in a calcareous soil at 25 degrees C and 50% water holding capacity. The plant residues had a wide range of N, cellulose, hemicelluloses, and lignin concentrations and C:N ratios. The N content of the residue was negatively associated with lignin (r = -0.965,P < 0.001), lignin:N (r = -0.943, P < 0.001). Net N mineralization (N-m/i) ranged widely (3.5-342.4 mg N kg(-1)) and was highly correlated with plant N concentration (r = 0.969, P < 0.001) and lignin content (r = -0.974, P < 0.001). The critical levels of N concentration, C:N ratio, lignin and lignin:N ratio of the plant residues at which neither N mineralization nor immobilization would occur were 10.8 g kg(-1), 30.7, 253.5 g kg(-1) and 17.0, respectively. In a multiple model, lignin concentration of the plant residue was the most important factor for predication of the net effects of plant residue on soil mineral N dynamics. (C) 2011 Elsevier Masson SAS. All rights reserved.
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