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4. 华北盐渍化草地不同氮添加水平土壤净氮矿化速率的季节动态(平均值±标准误)。**表示差异性在0.01水平上显著。N0、N1、N2、N4、N8、N16、N24、N32分别表示氮添加水平分别为0、1、2、4、8、16、24、32 g·m-2。
Fig. 4. Seasonal dynamics of soil net N mineralization rates under different levels of nitrogen addition in a saline-alkaline grassland of northern China (mean ± SE). ** means the difference is significant at the level of 0.01. N0, N1, N2, N4, N8, N16, N24 and N32 indicated that the nitrogen addition levels were 0, 1, 2, 4, 8, 16, 24 and 32 g·m -2, respectively.
