不同根系分泌物对土壤N2O排放及同位素特征值的影响

庄姗,林伟,丁军军,郑欠,寇馨月,李巧珍,李玉中

Effects of Different Root Exudates on Soil N2O Emissions and Isotopic Signature

Shan ZHUANG,Wei LIN,JunJun DING,Qian ZHENG,XinYue KOU,QiaoZhen LI,YuZhong LI

Table 1 Cumulative emissions of N2O and daily weighted average of isotope signature

处理 Treatment N2O累计排放量 (mg·kg-1·d-1) δ18O (‰) δ15Nbulk (‰) SP (‰) 草酸 Oxalic acid CL 2.68±1.34ab 24.16±1.55a -19.82±7.41abc 17.03±0.40a CH 1.38±0.24bc 24.08±1.22a -20.31±5.82abc 13.13±2.70b 丝氨酸 Serine AL 1.81±0.45abc 25.33±0.39a -24.44±1.95c 15.71±0.78ab AH 2.56±0.45ab 24.68±1.11a -20.21±2.11abc 14.35±1.47ab 葡萄糖 Glucose PL 1.61±0.79bc 25.59±0.25a -13.12±1.13a 16.16±1.40a PH 3.23±1.33a 24.09±2.30a -14.6±4.38ab 15.18±1.04ab 对照 Control treatment 0.90±0.09c 20.06±1.52b -23.14±3.72c 13.29±1.40b 添加根系分泌物 Adding root exudates <0.001** 0.196 0.089 0.032* 组分 Component 0.718 0.495 0.017* 0.718 浓度 Concentration 0.38 0.261 0.726 0.012* 组分×浓度 Component×Concentration 0.0278* 0.611 0.51 0.222