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1,2, 刁华杰1,3, 覃楚仪4, 郝杰3, 申颜1, 董宽虎3, 王常慧1,3,*(
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Response of soil net nitrogen mineralization to different levels of nitrogen addition in a saline-alkaline grassland of northern China
XU Xiao-Hui1,2, DIAO Hua-Jie1,3, QIN Chu-Yi4, HAO Jie3, SHEN Yan1, DONG Kuan-Hu3, WANG Chang-Hui1,3,*()
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图3. 2017-2019年华北盐渍化草地不同氮添加水平铵态氮、硝态氮和无机态氮含量变化(平均值+标准误)。不同小写字母表示差异显著(p < 0.05)。*表示施肥和对照的差异性在0.05水平上显著; **表示施肥和对照差异性在0.01水平上显著。小图中不同颜色对应柱状图的不同氮添加水平。
Fig. 3. Changes of soil NH4+-N, NO3--N and inorganic nitrogen concentration under different levels of nitrogen addition in 2017-2019 of a saline-alkaline grassland of northern China (mean + SE). Different lowercase letters indicate significant differences (p < 0.05). * means the difference is significant at the level of p < 0.05, and ** means the difference is significant at the level of p < 0.01. Different colors in the small picture correspond to different nitrogen addition levels in the histogram.
