黄淮海冲积平原区土壤速效磷、钾的时空变异特征

通过分析1980年和2000年124个样点耕层土壤的速效磷和速效钾含量,研究了黄淮海冲积平原区河北省曲周县土壤速效磷、钾的时空变异特征。结果表明,2000年该县土壤速效磷和速效钾含量平均为8.8mg/kg和90.0mg/kg,分别比1980年增加了69.2%和降低了46.1%。由于区域间农业管理措施的差异,占全县耕地面积31%和92%的土壤速效磷和速效钾含量明显降低。20年中潮土、盐土和褐土速效磷含量分别增加了3.5mg/kg、5.8mg/kg和4.5mg/kg,速效钾含量相应降低了80.1mg/kg、30.4mg/kg和39.0mg/kg。

Temporal-spatial variability of soil available phosphorus and potassium in the alluvial region of the Huang-Huai-Hai Plain

The temporal spatial variability of available phosphorus (AP) and available potassium (AK) was studied by the analysis of their changes in the arable layers of the 124 sampling sites in the alluvial region of the Huang Huai Hai Plain, Quzhou county, Hebei province from 1980 to 2000 The results indicated that the average content of AP and AK in the county was 8.8 mg/kg and 90.0 mg/kg in 2000, 69.2% higher and 46.1% lower, respectively, than that in 1980 It is worthwhile noting that the content of AP and AK in 31% and 92% of the arable land of the county, respectively, decreased in a period of twenty years During the period, AP of fluvo aquic soil, saline soil, and cinnamon soil increased by 3.5 mg/kg, 5.8 mg/kg, and 4.5 mg/kg, and their AK decreased by 80.1 mg/kg, 30.4mg/kg, and 39.0mg/kg, respectively Key words: Huang Huai Hai Plain; plowed layer of soil; available phosphorus; available potassium; temporal spatial variability