THE EFFECT OF TIME AND TEMPERATURE ON NITROGEN MINERALIZATION IN ARCTIC TUNDRA SOILS

被引:47
作者
MARION, GM
BLACK, CH
机构
[1] San Diego State Univ, San Diego, CA,, USA, San Diego State Univ, San Diego, CA, USA
关键词
NITROGEN - Modification - THERMAL EFFECTS - Mathematical Models;
D O I
10.2136/sssaj1987.03615995005100060018x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The objective of this work was to evaluate several mathematical models for describing N mineralization in three arctic tundra soils (Histic Pergelic Cryaquepts) as functions of time and temperature. Intact soil cores were collected in the field and incubated in a laboratory at 5, 15, 25, and 35 degree C for 11 weeks. The exponential equation fit the data well at 35 degree C but was generally unsuited for describing N mineralization at lower temperatures. The parabolic equation better fit the N mineralization data than the exponential equation except in a few cases where the data appeared to be approaching an asymptote. The parameters of the parabolic equation did not follow simple trends with respect to temperature, however, which made interpolating between experimental temperatures difficult. A second-order polynomial equation with respect to both time and temperature was evaluated.
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页码:1501 / 1508
页数:8
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