西北林学院学报2024，Vol.39Issue(4)：15-23,9.DOI:10.3969/j.issn.1001-7461.2024.04.02
水氮互作下银杏叶绿素含量与颜色特征的相关分析及估测
Correlation Analysis and Estimation of Chlorophyll Content with Color Characteristics for Ginkgo biloba Under Water-Nitrogen Interactions
摘要
Abstract
Chlorophyll content is an important indicator of plant growth status.Traditional methods for measuring chlorophyll are time-consuming and laborious,which can cause damage to plants.Recently,dig-ital image processing technology has made great progress in estimating plant chlorophyll content,but there is still limited research focusing on non-commercial tree forest such as ginkgo(Ginkgo biloba).In this study,2-year-old ginkgo seedlings under different water-nitrogen interaction conditions were used as the re-search objects,and the leaf images of ginkgo seedlings were acquired by digital scanner.The color feature parameters were constructed by using digital image technology,and the color parameters that were signifi-cantly related to chlorophyll were screened out by correlation analysis,and the most important color pa-rameters were selected based on Gaussian process regression(GPR)and partial least squares regression(PLSR)to establish a model for the estimation of chlorophyll content based on the color parameters of ginkgo leaves.The results showed that the chlorophyll content gradually increased with the increase of ni-trogen application level and water treatment level,and then decreased slowly.The prediction accuracy of the univariate regression model based on a single color parameter(R2=0.01-0.72)was generally lower than that of the model using GPR(R2=0.79-0.81)and PLSR(R2=0.75-0.77)methods.Among them,the GPR-BAT model and PLSR-VIP model both screened out the chlorophyll-sensitive R and G color characteristic parameters.GPR models performed better than PLSR models overall,especially when mod-eled using GPR-BAT preferred color parameters(R2=0.81).The GPR model that is built on the basis of optimal color parameters(selected from the GPR-BAT method)performs best,which can accurately esti-mate the chlorophyll content of ginkgo leaves,and provide technical support for the accurate management of ginkgo production and monitoring the growth of ginkgo.关键词
银杏/水氮互作/叶绿素/颜色特征/高斯过程回归/偏最小二乘回归Key words
Ginkgo biloba/water-nitrogen interactions/chlorophyll/color characteristics/Gaussian process regression/partial least squares regression分类
农业科技引用本文复制引用
裘赛铤,朱兴洲,岳子龙,陶心语,周凯..水氮互作下银杏叶绿素含量与颜色特征的相关分析及估测[J].西北林学院学报,2024,39(4):15-23,9.基金项目
国家自然科学基金项目(32101521) （32101521）
江苏省高等学校基础科学(自然科学)研究项目(21KJB220003). （自然科学）
