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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,*()
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,*()

图7. 华北盐渍化草地不同水平氮添加净氮矿化速率与土壤温度、湿度、土壤pH以及地下生物量的相关性。p > 0.05表示净氮矿化速率与土壤指标呈显著相关关系, p < 0.05表示净氮矿化速率与土壤指标无显著相关关系。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. 7. Correlation between net nitrogen (N) mineralization rates and soil temperature (ST), soil moisture (SM), pH and below- ground biomass (BGB) under different levels of N addition in a saline-alkaline grassland of northern China. p > 0.05 indicated that there was a significant correlation between the net N mineralization rate and soil indicators; p < 0.05 indicated that there was no significant correlation between the net nitrogen mineralization rate and soil indicators. 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.