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2 颗粒态有机质(POM)和矿质结合态有机质(MAOM)的氮(N)含量影响因子的基于赤池信息推测的最优模型筛选

Table 2 Summary of the best corrected Akaike Information Criterion (AICc)-selected models for the nitrogen (N) content in particulate organic matter (POM) and mineral associated organic matter (MAOM)

响应变量 Response variable 因子 Factor 模型Model 1 2 3 4 POM氮含量 N content in POM 常数项 Constant term 1.770 1.697 0.090 - 地上生物量 Aboveground biomass 0.003 0.002 0.003 - 微生物生物量碳含量 Microbial biomass carbon content 0.002 - - - C:N -1.111 -0.067 - - 赤池信息准则 Akaike information criterion 24.90 21.95 17.66 - MAOM氮含量 N content in MAOM 常数项 Constant term 1.202 1.451 0.762 0.702 黏粒与粉粒含量 Silt and clay content 0.031 0.029 0.036 0.030 微生物生物量碳含量 Microbial biomass carbon content -0.002 -0.001 - - 异养呼吸速率 Heterotrophic respiration rate 0.375 - - - 地上生物量 Aboveground biomass -0.002 -0.002 -0.001 - 赤池信息准则 Akaike information criterion 5.92 5.17 3.01 2.30