长期施肥下华北潮土生产力演变及影响因素分析
王乐1,陈延华1,2,张淑香1(
),马常宝3,孙楠1,李春花1()
),马常宝3,孙楠1,李春花1()
Evolution of Fluvo-Aquic Soil Productivity Under Long-Term Fertilization and Its Influencing Factors
WANG Le1,CHEN YanHua1,2,ZHANG ShuXiang1(),MA ChangBao3,SUN Nan1,LI ChunHua1()
),MA ChangBao3,SUN Nan1,LI ChunHua1()
图1. 潮土常规施肥处理下小麦、玉米产量
盒式图下边缘线和上边缘线分别代表全部数据的5%和95%,上下实心点为异常值;矩形盒上、下边缘分别代表上四分位数和下四分位数,分别代表全部数据的75%和25%;盒中实线代表中值,虚线代表平均值;矩形盒上的不同字母表示不同监测时期在5% 水平上差异显著。图4同
Fig. 1. Crop yields in conventional fertilization treatment of the long-term observation sites of fluvo-aquic soil
The lower and upper edge lines represent the 5% and 95% of the data, the solid points represent the vertical outliers. The lower and upper quartiles of the boxplots represent 25% and 75% of data, and the solid lines represent the median values and the dash lines represent the average values. Different letters above the boxplot indicate significant differences among the three mentoring periods at 0.05 level. The same as Fig.4
