不同降雨年型黑膜垄作对土壤水肥环境及马铃薯产量和效益的影响

杨封科,何宝林,董博,王立明

Effects of Black Film Mulched Ridge-Furrow Tillage on Soil Water- Fertilizer Environment and Potato Yield and Benefit Under Different Rainfall Year in Semiarid Region

YANG FengKe,HE BaoLin,DONG Bo,WANG LiMing

表4 马铃薯产量与土壤有效磷、钾、氮（AP,AK,AN）、蒸散值（ET）和生育期降水量（GPR）之间的相关关系

Table 4 Relationship of potato yield and the available phosphorus, potassium nitrogen (AP, AK, AN), the evapotranspiration (ET) and the precipitation in growing season (PGS)

变量 Variable 与产量相关关系 (r) 直接效应Direct effect 间接效应Indirect effect 总效应 Total effect →x1 →x2 →x3 →x4 →x5 AP (x1) 0.828** 0.473 0.1057 -0.1075 0.2171 0.1394 0.3547 ET (x2) -0.606* -0.548 -0.0914 0.1697 -0.0879 -0.0487 -0.0583 PGR (x3) 0.204 -0.375 0.1359 0.2481 0.1342 0.0600 0.5781 AK (x4) 0.804** 0.258 0.3977 0.1862 -0.1944 0.1562 0.5457 AN (x5) 0.807** 0.175 0.3764 0.1523 -0.1281 0.2303 0.6308