氮添加量和施氮频率对温带半干旱草原土壤呼吸及组分的影响

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杨泽¹^,², 嘎玛达尔基¹^,², 谭星儒¹^,², 游翠海¹^,², 王彦兵¹^,², 杨俊杰¹, 韩兴国¹^,², 陈世苹¹^,²^,^*(

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Effects of nitrogen addition amount and frequency on soil respiration and its components in a temperate semiarid grassland

YANG Ze¹^,², null null¹^,², TAN Xing-Ru¹^,², YOU Cui-Hai¹^,², WANG Yan-Bing¹^,², YANG Jun-Jie¹, HAN Xing-Guo¹^,², CHEN Shi-Ping¹^,²^,^*(

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图3. 2018和2019年氮添加量和施氮频率对土壤呼吸速率(R_s)及其异养(R_h)和自养(R_a)组分季节平均值的影响。图中数据为平均值±标准误差。图中不同颜色的图标分别代表0、2、5、10、20、50 g·m^-2·a^-1氮添加处理。图中给出了氮添加量(N)、施氮频率(NF)及其交互作用(N × NF)对土壤呼吸及其组分的差异显著性检验结果(***, p < 0.001; **, p < 0.01; *, p < 0.05; ns, p > 0.05)。图中的小写字母代表不同氮添加量处理间的差异显著性, 相同字母表示无显著差异(p > 0.05), 不同字母表示具有显著差异(p < 0.05)。

Fig. 3. Seasonal mean values of soil respiration rate (R_s) and its heterotrophic (R_h) and autotrophic (R_a) components under different N addition amount and frequency treatments in 2018 and 2019. Data are mean ± SE. The different color icons in the figure represent N addition treatments with 0, 2, 5, 10, 20, 50 g·m^-2·a^-1, respectively. The ANOVA results were shown in the figure to address the significance of effects of N addition amount (N), frequency (NF) and their interactions (N × NF) on the parameters (***, p < 0.001; **, p < 0.01; *, p < 0.05; ns, p > 0.05). The lowercase letters in the figure represent the significance among different nitrogen addition treatments. The same letter means no significance (p > 0.05), while different letters mean significant differences (p < 0.05). HF, N addition with high frequency; LF, N addition with low frequency.