华北农学报Issue(z1)：435-440,6.DOI:10.7668/hbnxb.2015.S1.079
基于偏最小二乘回归的假植期烤烟幼苗生长的水氮耦合效应研究
The Study on the Coupling Effect of Water and Nitrogen on the Flu-cured Tobacco Seedlings at Provisional Planting Stage Based on Partial Least Squares Regression
摘要
Abstract
Reasonable water and nitrogen management is a pivotal factor affecting the sound seedling index of the flu-cured tobacco seedlings at provisional planting stage.In order to study the ratio of water and nitrogen for the flu-cured tobacco seedlings at provisional planting stage,this article studied the coupling effect of relative moisture content and nitrogen application amount on the growth of flu-cured tobacco seedlings and got the coupling ratio of water and nitrogen of the flu-cured tobacco seedlings at provisional planting stage using partial least squares regres-sion method.Results showed that both of the relative moisture content and nitrogen application amount significantly affected the growth of flu-cured tobacco seedlings.Specifically,all of the growth factors except of ground biomass showed a tendency of first increased and then decreased along with the rising relative water content of soil.Where-as,the changing patterns of growth factors were not consistent with the rising nitrogen application amount.The two single factors relative water content of soil and nitrogen application amount had dramatic influence on all of growth factors excepted for ground biomass.Whereas,the coupling effect of water and nitrogen had significantly influenced rather on underground fresh weight and ground biomass than other growth factors.The quadratic polynomial equation obtained by matching growth factors of flu-cured tobacco seedlings with relative water content of soil and nitrogen application amount using partial least squares regression method indicated that only the fitting coefficient R 2 of ground biomass was poor,but other growth factors were high.The coefficient of nitrogen application amount(X2 ) in the equation was distinctly higher than that of relative water content of soil(X1 ),namely the positive effect of nitro-gen application amount on the growth of flu-cured tobacco seedlings was greater than that of relative water content of soil.The optic relative water content of soil was 58.46% and which corresponded to the best growth status of flu-cured tobacco seedlings at provisional planting stage was determined by using the obtained quadratic polynomial e-quation at the conditions of this study.Well,the optic nitrogen application amount was 1.53 g/kg with an alkali-hy-drolyzable nitrogen of culture medium at 0.34 g/kg.关键词
烤烟幼苗/生长/水氮耦合/偏最小二乘回归模型Key words
Flu-cured tobacco seedlings/Growth/Coupling effect of water and nitrogen/Partial least squares regression分类
农业科技引用本文复制引用
贺国强,徐永军,齐虹凌,朱富国,李慧,秦玉宝,元野..基于偏最小二乘回归的假植期烤烟幼苗生长的水氮耦合效应研究[J].华北农学报,2015,(z1):435-440,6.基金项目
黑龙江省烟草专卖局科技攻关项目（HN201001；HN201303）；公益性行业（农业）科研专项资助项目（201203091）；中国烟草总公司科技重大专项资助项目（110201101006（ts－06）） （）
