华北平原土壤肥力的变化与影响因素分析

Analyses on the Changes of Soil Fertility of North China Plain and the Affecting Factors.

通过对２０世纪以来华北平原土壤调查数据的分析对比，揭示了从传统农业向现代农业转变的过程中土壤肥力的变化。从总体上看，冀北地区的土壤肥力有所下降，而冀南和鲁西北地区有所上升。影响肥力变化的因子包括河流治理、施肥、高产品种使用后种植制度和土地利用程度的变化等等。

After a comparative analysis on the soil investigation data of North China Plain in the 20th century, the changes of soil fertility in the process of agriculture practices changing from traditional agriculture to modern agriculture have been expounded. The results of the analysis show that the soil fertility has been increased in northern Hebei and decreased in southern Hebei and northwestern Shandong. The factors affecting soil fertility are: river harnessing, fertilizer application, and the changes in cropping system and land utilization after the adoption of high yield hybrid verities.