Environmental influences on nitrogen transformation of different quality tree litter under submerged and aerobic conditions |
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Authors: | Email author" target="_blank">P?VityakonEmail author N?Dangthaisong |
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Institution: | (1) Department of Land Resources and Environment, Faculty of Agriculture, Khon Kaen University, Khon Kaen |
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Abstract: | Trees in farming systems can improve fertility of soils through mineralization of N in their litter. This study was to determine
the quality parameters (i.e., chemical composition) of organic residues that are associated with N mineralization in soils
under submerged and aerobic conditions, and to demonstrate that aeration conditions should be taken into account in categorization
of organic residues as N sources in farming systems. Incubation experiments were conducted in Aeric Paleaquult soil under
submerged and Oxic Paleustult soil under aerobic conditions. Treatments included litter and some fresh materials from trees
as well as rice straw available in farming systems of Northeast Thailand. S. grandiflora and L. leucocephala (32 g kg−1 N) had the highest net N mineralization in both conditions. Some lower-quality (< 20 g kg−1 N) residues did exhibit low net N mineralization during the 16-week period under submerged conditions, but displayed almost
no net N mineralization in aerobic conditions. Under submerged conditions, their net N mineralization was higher and more
rapid. The nitrogen content of the residues was the most important factor controlling N mineralization under both conditions.
Polyphenols exerted the highest negative influence on N mineralization in aerobic conditions, but exhibited no negative effect
in submerged conditions. In categorizing organic residues for their effective use in soil fertility management, soil aeration
conditions, as well as other environmental factors, should be taken into consideration in addition to residue quality. |
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Keywords: | N mineralization Northeast Thailand Polyphenols Protein-binding capacity Residue classification Soil aeration |
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