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, 杨森, 王欣, 黄俊胜, 王斌, 刘卫星, 刘玲莉

Responses of soil nitrogen in different soil organic matter fractions to long-term nitrogen addition in a semi-arid grassland

WU Yun-Tao, YANG Sen, WANG Xin, HUANG Jun-Sheng, WANG Bin, LIU Wei-Xing, LIU Ling-Li

表1 氮添加和土壤粉粒与黏粒含量对土壤颗粒态有机质(POM)和矿质结合态有机质(MAOM)碳、氮含量影响的广义线性混合模型(GLMM)分析结果

Table 1 Summary of the generalized linear mixed model (GLMM) for the effects of nitrogen (N) addition and silt and clay content on the carbon (C) and N content in particulate organic matter (POM) and mineral associated organic matter (MAOM)

响应变量 Response variable 变量 Variable 相关系数 Correlation coefficient 标准误 Standard error t p POM碳含量 C content in POM 氮添加水平 N addition (g·m-2·a-1) 0.022 0.028 0.793 0.446 黏粒与粉粒含量 Silt and sand clay content (%) 0.013 0.187 -0.068 0.947 MAOM碳含量 C content in MAOM 氮添加水平 N addition (g·m-2·a-1) -0.043 0.019 -2.287 0.045 黏粒与粉粒含量 Silt and sand clay content (%) 0.396 0.126 3.145 0.010 POM氮含量 N content in POM 氮添加水平 N addition (g·m-2·a-1) 0.014 0.003 4.045 0.002 黏粒与粉粒含量 Silt and sand clay content (%) -0.030 0.021 -2.086 0.182 MAOM氮含量 N content in MAOM 氮添加水平 N addition (g·m-2·a-1) -0.002 0.001 -1.408 0.162 黏粒与粉粒含量 Silt and sand clay content (%) 0.035 0.010 3.586 0.005