河西绿洲农田土壤呼吸特征及其对长期施肥的响应

陈仕阳, 杨荣, 苏永中, 杜泽玉

Characteristics of soil respiration in farmland of Hexi oasis and its response to long-term fertilization

Shiyang Chen, Rong Yang, Yongzhong Su, Zeyu Du

表3 土壤呼吸（ Rs ）与土壤湿度（ θ ）的关系方程及平均土壤湿度

Table 3 Fitted equation parameters of soil respiration rate with soil moisture and average soil moisture

处理 拟合方程 R2 样本数 P 平均土壤湿度/% M3 Rs=1.222θ2-0.051θ+1.791 0.113 60 <0.05 12.8 NP3 Rs=8.485e-0.021θ 0.077 60 <0.05 11.6 NP1M3 Rs=0.219θ2-0.013θ+6.090 0.154 60 <0.01 14.2 NPK1 Rs=0.346θ2-0.018θ+4.954 0.288 60 <0.01 13.3 NPK2 Rs=-0.119θ2+0.001θ+7.48 0.137 60 <0.05 13.3 NPK3 Rs=0.817θ2-0.040θ+2.472 0.364 60 <0.01 12.0 NPK1M3 Rs=0.782θ2-0.030θ+1.977 0.189 60 <0.01 14.3 NPK2M2 Rs=0.084θ2-0.010θ+7.206 0.266 60 <0.01 13.3 NPK3M1 Rs=0.571θ2-0.032θ+4.766 0.345 60 <0.01 11.8