Douglas-fir soil C and N properties a decade after termination of urea fertilization

被引:27
作者
Homann, PS [1 ]
Caldwell, BA
Chappell, HN
Sollins, P
Swanston, CW
机构
[1] Western Washington Univ, Huxley Coll, Dept Environm Sci, Bellingham, WA 98225 USA
[2] Oregon State Univ, Dept Forest Sci, Corvallis, OR 97331 USA
[3] Univ Washington, Coll Forest Resources, Seattle, WA 98195 USA
关键词
D O I
10.1139/cjfr-31-12-2225
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Chemical and microbial soil properties were assessed in paired unfertilized and urea fertilized (> 89 g N.m(-2)) plots in 13 second-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands distributed throughout western Washington and Oregon. A decade following the termination of fertilization, fertilized plots averaged 28% higher total N in the O layer than unfertilized plots, 24% higher total N in surface (0-5 cm) mineral soil, and up to four times the amount of extractable ammonium and nitrate. Decreased pH (0.2 pH units) caused by fertilization may have been due to nitrification or enhanced cation uptake. In some soil layers, fertilization decreased cellulase activity and soil respiration but increased wood decomposition. There was no effect of fertilization on concentrations of light and heavy fractions, labile carbohydrates, and phosphatase and xylanase activities. No increase in soil organic C was detected, although variability precluded observing an increase of less than similar to 15%. Lack of a regionwide fertilization influence on soil organic C contrasts with several site-specific forest and agricultural studies that have shown C increases resulting from fertilization. Overall, the results indicate a substantial residual influence on soil N a decade after urea fertilization but much more limited influence on soil C processes and pools.
引用
收藏
页码:2225 / 2236
页数:12
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