山西省主要农田土壤速效养分状况与分布

摘要

Using the data of 75 typical profiles, we analyzed the status and distribution of farmland soil active nutrients in Shanxi province. The mean contents of soil available P, K and alkali-hydrolyzed nitrogen at 0 ~ 20 cm soil depths of typical cropland were 14.15, 141.80 and 63.29 mg/kg respectively. It is summarized that the study areas were generally high of soil active P and K, with moderate alkali-hydrolyzed N contents. The content of active P presented a gradual reduction trend from the south to the north and from northwest to southeast. The active potassium content in the south was higher than that in the north. The content of alkali-hydrolyzed N in the southeast was the highest. The spatial distribution characteristic of soil active nutrients provided a theoretical basis for farmland management in Shanxi province.%利用在山西省采集的75个典型农田剖面数据,系统分析了山西省农田土壤速效养分状况与分布规律,研究结果表明,2007年山西省主要农田耕层土壤速效磷、速效钾和碱解氮平均含量为14.15,141.80,63.29 mg/kg,山西省整体速效磷和速效钾含量较丰富,碱解氮含量处于中等水平.不同的速效养分空间分布格局不同,土壤速效磷具有从南向北、从西北至东南逐渐降低的趋势；土壤速效钾分布总体呈现从南向北降低的趋势；土壤碱解氮则呈现自东南向西北、自南向北依次降低的趋势.农田土壤速效养分的空间分布特征为农田管理提供了理论依据.