【摘要】 在蒸渗仪条件下,对不同水氮互作处理的烤烟叶面积指数随时间(移栽后天数)的变化曲线,建立相关模型,进行拟合分析研究。结果表明,烤烟全生育期内叶面积指数变化呈现缓慢增长,快速增长和衰退3个阶段,水氮互作处理间的叶面积指数相差不大;线性模型和指数模型均能较好的拟合叶面积指数的动态变化,经筛选,指数模型拟合的相关系数和精度较高,参数少,具有更强的实用性。更多还原

【Abstract】 Changes of LAI of tobacco under different treatments of water and nitrogen coupling were analyzed in this article.The simulation models were built based on the curves about LAI varying with time(days after transplanting).The results show that stages of changes of LAI during growth period of tobacco can be divided into three phases:slower growth period,acceleration period,recession period.LAI of tobacco under different treatments of water and nitrogen coupling had few discrepancies.Dynamic changes of LAI could be expressed well by both linear and exponential models,but linear model were more practical on account of higher correlation coefficient and fitting accuracy and less parameters.更多还原