草地土壤有机质不同组分氮库对长期氮添加的响应
武运涛1,2, 杨森1,2, 王欣1, 黄俊胜1, 王斌1,2, 刘卫星1, 刘玲莉1,2,*(
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Responses of soil nitrogen in different soil organic matter fractions to long-term nitrogen addition in a semi-arid grassland
WU Yun-Tao1,2, YANG Sen1,2, WANG Xin1, HUANG Jun-Sheng1, WANG Bin1,2, LIU Wei-Xing1, LIU Ling-Li1,2,*()
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图5. 土壤中不同有机质组分的碳氮含量与氮添加水平(A, C)和土壤黏粒与粉粒含量(B, D)的关系。实线表示相关性显著(p < 0.05), 虚线表示相关性不显著。□, 矿质结合态有机质(MAOM); △, 颗粒态有机质(POM)。
Fig. 5. Relationships between the soil carbon (C) in different SOM fractions and nitrogen (N) addition rates (A), and soil clay and silt content (B); and relationships between the soil N in different SOM fractions and N addition rates (C), and soil clay and silt content (D). Solid and dashed lines represent significant (p < 0.05) and insignificant (p > 0.05) relationships, respectively. □, mineral associated organic matter (MAOM); △, particulate organic matter (POM).
