摘要
通过室内大型土柱模拟研究钾肥在砖红壤中的淋失特征,结果表明:K+在砖红壤中运移速度较快,灌水30mm即3d后既可从20cm处淋出;60cm处渗漏液中K+浓度在39d后随着时间的推移逐渐下降,淋失浓度与施肥量表现出正相关;45d后120cm处渗漏液中K+浓度才随着施肥量的增加而上升,推测其运移速度为2 7cm/d。K+在120cm处的累计淋失量与施肥量成正相关,其淋失率为3 28%。应用方程lnYt=a+blnt可拟合不同钾肥施用量下砖红壤中120cm处K+的累计淋失量随时间的变化关系。
The objective of this study was to estimate the losses of potassium in the laboratory by large leaching soil columns containing disturbed soils. Results are as follows: Potassium moves quickly in the latosol. There are K^+ which deriving from potassium fertilizer in the leachate at 20 cm depth after irrigating30 mm water;Concentration of K^+ in the leachate at 60 cm depth are descending with the time growing and positively related to the fertilizer quantity applied after 39 days; Concentration of K^+ in the leachate at 120 cm depth ascends with the fertilizer quantity applied after 45 days, and the movement velocity of potassium in the test is about 2.7 cm/d. Accumulation leaching amount of at 120 cm depth are positively related with the fertilizer quantity applied and their leaching ratio is 3.28%. Using equation lnY_t=a+blnt can describe the relation between the accumulation leaching amount of K^+ with time at 120 cm depth with different potassium fertilizer quantity applied.
出处
《水土保持学报》
CSCD
北大核心
2004年第6期93-96,共4页
Journal of Soil and Water Conservation
基金
中国热带农业科学院博士启动基金的部分研究内容
