Predictors of gross N mineralization and immobilization during decomposition of stabilized organic matter in agricultural soil

Saved in:
Online Access: Get full text
doi: 10.1111/j.1365-2389.2008.01023.x
Authors:Herrmann, A. M.; Witter, F.
Author Affiliations:Primary:
Swedish University of Agricultural Sciences, Department of Soil Sciences, Uppsala, Sweden
Volume Title:European Journal of Soil Science
Source:European Journal of Soil Science, 59(4), p.653-664. Publisher: Wiley-Blackwell on behalf of the British Society of Soil Science, and the National Societies of Soil Science in Europe, Oxford, United Kingdom. ISSN: 1351-0754
Publication Date:2008
Note:In English. 36 refs.; illus., incl. 3 tables
Summary:Long-term additions of different types of organic amendments affect the amount of soil organic matter. Less is known about how this in turn affects carbon (C) and nitrogen (N) mineralization from the pool of stabilized soil organic matter, or the extent to which gross N immobilization influences the net amount of N mineralised. Soils, differing in the quantity and quality of organic matter inputs they had received since 1956, were sampled approximately 6 or 18 months after the most recent applications of organic amendments. Two laboratory experiments were carried out: 1) to evaluate if, and how, the organic amendments had affected C mineralization, gross and net N mineralization; 2) to examine the relation between gross N immobilized and free-light fraction of organic matter; and 3) to assess predictors for gross N mineralization and immobilization rates in soils. The amount of soil organic C and N were major determinants of C and gross N mineralization, but not of net N mineralization. Carbon mineralization was related to gross N mineralization, but the ratio between the two was not constant. Gross N immobilization was related to the amount of free-light fraction material in the soil with 90% variation explained. For most common organic amendments applied in autumn, the results support the use of total soil organic N and C mineralization as predictors of gross N mineralization from stabilized soil organic matter. It is proposed that the amount of free-light fraction material present in the soil in spring is adequate as a predictor of the immobilization potential of the soil, without any need to consider the C-to-N ratio of this material. [G.L.B.]
Subsections:Organic geochemistry; Petrology; weathering; soils
Subjects:Agriculture; Carbon; Experimental studies; Fertilizers; Isotopes; Laboratory studies; Mineralization; Mobilization; N-15; Nitrogen; Nutrients; Organic compounds; Soil treatment; Soils; Stable isotopes; Statistical analysis; Europe; Scandinavia; Sweden; Uppsala Sweden; Western Europe; Decomposition; Soil organic matter
Coordinates:N600000 N600000 E1700000 E1700000
Abstract Numbers:08M/3464
Record ID:2016108137
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Tags: Add Tag
No Tags, Be the first to tag this record!