华北盐渍化草地土壤净氮矿化速率对不同水平氮添加的响应

徐小惠, 刁华杰, 覃楚仪, 郝杰, 申颜, 董宽虎, 王常慧

Response of soil net nitrogen mineralization to different levels of nitrogen addition in a saline-alkaline grassland of northern China

XU Xiao-Hui, DIAO Hua-Jie, QIN Chu-Yi, HAO Jie, SHEN Yan, DONG Kuan-Hu, WANG Chang-Hui

表2 不同氮添加水平和处理时间对华北盐渍化草地土壤铵化速率、硝化速率、净氮矿化速率影响的双因素方差分析

Table 2 Two-way ANOVA on the effects of nitrogen addition and year on soil net ammonification, nitrification and net nitrogen mineralization rates of the salinized grassland of northern China

因素 Factor 铵化速率 Ammonification rate 硝化速率 Nitrification rate 净氮矿化速率 Net nitrogen mineralization rate F p F p F p 年份 Year (Y) 6.167 <0.05 35.338 <0.001 5.275 <0.05 氮添加 Nitrogen addition (N) 7.879 <0.001 12.592 <0.001 9.455 <0.001 年份×氮添加 (Y × N) 3.664 <0.05 14.516 <0.001 2.315 <0.05