摘要
在北京北郊高、中、低三种肥力水平的潮土上,研究了土壤有效氮、磷、钾的周年变化规律.结果表明;土壤有效氮的含量为冬、春季低于作物生长时期的夏、秋季,而有效磷、钾含量则是夏、秋季低于冬、春季.影响这种变化的因素,主要是气温、降水、作物吸收和土壤微生物的活性等.
The anniversary changing regularity of the available nitrogen, phosphorus and patassium of three different fertility degrees (high, middle. and low) aquall has been studied in the north suburb of Beijing. The results indicates that it had lower available nitrogen in Winter and Spring than that in Autumn and Summer; but higher available phosphorus and potassium in Spring and Winter than that in Summer and Autumn. The major influential factors of the changes are the atmospheric temperature, precipitation, plant absorption, the activity of soil microbe and so on.
出处
《北京农学院学报》
1990年第2期6-10,共5页
Journal of Beijing University of Agriculture
关键词
土壤有效养分
周年变化
available soil nutrient
anniversary changes
