汉江一级阶地不同类型灰潮土肥力差异性分析

Analysis on the Difference of the Soil Fertility in Different Types of Grey Fluvo-aquic Soil in the First Terrace of Hanjiang River

[目的]摸清一级阶地土壤的养分状况和变化规律,为该区域测土施肥提供参考。[方法]在汉江一级阶地上对灰潮沙土、灰潮油沙土、灰潮泥土3个土种各采集40个样品,进行土壤理化性质测定及对比分析,分析汉江一级阶地不同类型灰潮土肥力的差异性。[结果]在汉江一级阶地由近代河流冲积物发育而成的灰潮土上,从阶地前缘的灰潮沙土向远阶地后缘的灰潮泥土,pH值逐渐降低,由石灰性向中性趋近,有机质和氮磷钾含量则逐渐升高,土壤肥力逐渐上升。3种土壤均缺钾。[结论]汉江一级阶地3种灰潮土类型的肥力存在着差异,在生产实践中应根据不同土壤类型的养分状况采用不同的施肥模式和措施。

[Objective] The study aimed to find out the nutrient status and variety law of first terrace in Hanjiang River and provide reference for determining soil and applying fertilizers.[Method] 40 samples were collected resp. from 3 soil types of grey fluvo-aquic sand soil, grey fluvo-aquic oil sand soll and grey fluvo-aqulc clay soil in first terrace in Hanjiang River and their physical and chemical properties were determined and compared to analyze the difference on soil fertilizers in different types of grey fluvo-aquic soil in first terrace in Hanjiang River. [Result] On the grey fluvo-aquic soil, which was developed from the alluvial deposit in modem rivers, on the first terrace of the Hanjiang River, from loose grey fluvo-aquic sand soil at the front of the terrace to the tide grey fluvo -aquic clay at the back of the terrace, the pH value descended gradually, the soll properties changed from alkalinity to neuterity, the content of organic material and N, P, K increased gradually and the soil fertility also ascended gradually. The potassium content was all lacked in 3 soil types. [Conclusion] There is a difference on soll fertilizers in different types of grey fluvo-aquic oil in first terrace in Hanjiang River. The different fertilization mode should be adopted according the nutrient status of different soil types in production practice.