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4. 土壤呼吸速率(R_s)及其异养(R_h)和自养(R_a)组分与土壤温度(ST)、土壤水分含量(SWC)和土壤pH之间的相关关系。图中不同颜色的图标分别代表0、2、5、10、20和50 g·m^-2·a^-1氮添加处理。圆形图标和黑色拟合线代表低频氮添加(LF)处理, 三角形图标和红色拟合线代表高频氮添加(HF)处理。实线代表相关关系显著(p < 0.1), 虚线代表相关关系不显著(p > 0.1)。

Fig. 4. Relationships between soil respiration rate (R_s) and its heterotrophic (R_h) and autotrophic (R_a) component with soil temperature (ST), soil water content (SWC) and soil pH value. Different color icons in the figure represent N addition treatments with 0, 2, 5, 10, 20, 50 g·m^-2·a^-1, respectively. The circle sign and black line represent the low frequency N addition (LF) treatment, and the triangle sign and red line indicate the high frequency N addition (HF) treatment. The solid line represents marginally significant relation (p < 0.1) and the dash line represents insignificant relation (p > 0.1).