降水量变化与氮添加下荒漠草原土壤酶活性及其影响因素

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朱湾湾¹^,², 王攀², 许艺馨², 李春环², 余海龙², 黄菊莹¹^,^*(

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Soil enzyme activities and their influencing factors in a desert steppe of northwestern China under changing precipitation regimes and nitrogen addition

ZHU Wan-Wan¹^,², WANG Pan², XU Yi-Xin², LI Chun-Huan², YU Hai-Long², HUANG Ju-Ying¹^,^*(

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图1. 2018和2019年降水量及氮(N)添加对土壤酶活性的影响(平均值±标准误)。W1、W2、W3、W4和W5分别代表降水量减少50%、减少30%、自然降水、增加30%和增加50%。N0和N5分别代表0和5 g·m^-2·a^-1的N添加水平。不同小写字母表示相同N添加水平下降水量处理间各指标存在显著性差异(p < 0.05)。*表示相同降水量下N添加处理间各指标存在显著性差异(p < 0.05)。

Fig. 1. Effects of precipitation and nitrogen addition on soil enzyme activities in 2018 and 2019 (mean ± SE). W1, W2, W3, W4, and W5 represent 50% reduction in precipitation, 30% reduction in precipitation, natural precipitation (control), 30% increase in precipitation, 50% increase in precipitation, respectively. N0 and N5 represent 0 and 5 g·m ^-2·a^-1 of nitrogen addition level, respectively. Different lowercase letters indicate significant difference (p < 0.05) of indices among precipitation treatments under the same nitrogen addition level. * indicates significant difference (p < 0.05) of indices among nitrogen addition treatments under the same precipitation.