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Some Factors Affecting the Soluble Ammonium‐Nitrogen Content of a Black Spruce Humus
Author(s) -
Roberge M. R.
Publication year - 1972
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1972.03615995003600020039x
Subject(s) - humus , chemistry , ammonium , nitrogen , decomposition , water content , organic matter , filtration (mathematics) , black spruce , environmental chemistry , soil water , soil science , organic chemistry , geology , ecology , biology , taiga , statistics , geotechnical engineering , mathematics
The influence of exchangeable NH 4 ‐N content, water content, and pH on the NH 4 ‐N content of the solution of three layers (L, F 1 , and F 2 ) of the surface organic horizon found under a black spruce ( Picea mariana (Mill.) BSP.) stand was investigated under controlled conditions in the laboratory. In the solution obtained by centrifugation‐filtration of the layers at 15,000 × g for 10 min the quantity of soluble NH 4 ‐N increased as the exchangeable NH 4 ‐N and the moisture of the layers were increased, and as the pH of the layers was decreased. Different layers were characterized by different levels of soluble NH 4 ‐N even when exchangeable NH 4 ‐N, moisture content, and pH value were comparable in these layers. Greater decomposition of the organic matter of the layers was always associated with lower contents of soluble NH 4 ‐N.