长期施肥下华北潮土生产力演变及影响因素分析

王乐,陈延华,张淑香,马常宝,孙楠,李春花

Evolution of Fluvo-Aquic Soil Productivity Under Long-Term Fertilization and Its Influencing Factors

WANG Le,CHEN YanHua,ZHANG ShuXiang,MA ChangBao,SUN Nan,LI ChunHua

表1 土壤各属性分级标准

Table 1 Grading standards of soil properties

分级 Grade pH 有机质 SOM 全氮 TN 有效磷 AP 速效钾 Ak xa 4.5 10 0.75 3 40 xc 6.5 20 1.5 10 100 xp 8.5 30 2 20 150