褐土耕地肥力质量与作物产量的变化及影响因素分析

对26个20多年长期定位试验的褐土土壤肥力质量和产量变化进行了分析。结果表明，从1986年到2006年，褐土区土壤有机质含量由11.50 g/kg上升到15.75 g/kg； 全氮由0.73 g/kg上升到1.07 g/kg； 碱解氮含量由73.5 mg/kg 上升到94.6 mg/kg，20年增加了21.1 mg/kg； 有效磷含量1998～2006年增加幅度较大，由18.1 mg/kg上升到28.7 mg/kg，年增加1.3 mg/kg； 速效钾含量也随时间呈一定的增加趋势。总之，褐土肥力总体呈稳中有升的趋势。土壤有机质、全氮、碱解氮和有效磷含量的上升趋势较土壤速效钾明显，土壤酸碱度保持基本稳定，作物产量也呈现了一定上升趋势。

Change of soil fertility indices and crop yield of cinnamon soil and its affecting factors

Based on the data collected from a long-term experiment of Cinnamon Soil for 26 sites,changes of soil fertility index and crop yield of Cinnamon Soil and its affecting factors had been analyzed.The results showed that the content of soil organic matter was increased from the beginning value 11.50 g/kg of 1986 to 15.75g/kg of 2006;the content of total N of soil was increased from the beginning value 0.73 g/kg of 1986 to 1.07 g/kg of 2006.The content of soil of available N was increased from 73.5 mg/kg in 198...