Relationship Between Chlorophyll and Leaf Spectral Characteristics and Their Changes Under the Stress of Phyllostachys Praecox
HU Xin-yu1, 2, XU Zhang-hua1, 2, 3, 5, 6*, HUANG Xu-ying1, 2, 8, ZHANG Yi-wei1, 2, CHEN Qiu-xia7, WANG Lin1, 2, LIU Hui4, LIU Zhi-cai1, 2
1. College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350108, China
2. Fujian Provincial Key Laboratory of Resource and Environment Monitoring & Sustainable Mangement and Utilization, Sanming University, Sanming 365004, China
3. Key Laboratory of Spatial Data Mining and Information Sharing, Ministry of Education, Fuzhou 350108, China
4. Fuzhou Zhonggu Haichuang Science and Technology Development Co., Ltd., Fuzhou 350108, China
5. School of Advanced Manufacturing, Fuzhou University, Quanzhou 362200, China
6. Postdoctoral Research Station of Information and Communication Engineering, Fuzhou University, Fuzhou 350108, China
7. School of Public Administration, Fujian Agriculture and Forestry University, Fuzhou 350002, China
8. International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
Abstract：Chlorophyll is an important physiological parameter reflecting the health status of green vegetation. The change mechanism of chlorophyll and leaf spectrum under pest stress is complex. It is of great significance to analyze the relationship between chlorophyll and leaf spectrum in depth for pest detection. Taking Shunchang County, Nanping City, Fujian Province as the experimental area, the leaf SPAD and leaf spectrum of Phyllostachys pubescens under different damage scenarios were measured. Pearson correlation method was used to screen the leaf spectrum characteristic indexes, and multiple linear regression, ridge regression, random forest and XGBoost estimation models of leaf SPAD were established. By comparing the screening results of spectral characteristics and the estimation effect of the model, the relationship between chlorophyll and leaf spectral characteristics of Phyllostachys pubescens under the stress of Pantana phyllostachysae was analyzed. The results showed that: (1) SPAD of Phyllostachys pubescens leaves showed a downward trend with the increase of insect pests; (2) Compared with the undamaged state, the spectral characteristics of Phyllostachys pubescens leaves changed obviously under the stress of Pantana phyllostachysae, and the “green peak” and “red valley” tended to disappear, the slope of “red edge” decreased, and the reflectance of near infrared wavelength decreased. (3) The best spectral characteristics of leaf SPAD based on full sample fitting are VOG2, R515/R570, CIred, PRI and NDVI705, and the best estimation model is multiple linear regression model (R2=0.753 7, RMSE=3.015 0). (4) SPAD of Phyllostachys pubescens leaves was fitted based on samples with different damage degrees. The optimal spectral characteristic indexes were health: CIred, VOG2, ARVI, R515/R570, DVI; mild hazard: RENDVI, RERVI and REDVI; moderate hazard: RENDVI, RERVI and REDVI; severe hazard: VOG2, CIred, NDVI705; off year: PRI, NDVI705, VOG1, CIred.The best estimation model is the multiple linear regression model, and the model accuracy is healthy (R2=0.882 3; RMSE=1.638 8); mild hazard(R2=0.180 2; RMSE=3.335 4); moderate hazard(R2=0.360 4; RMSE=3.886 7); severe hazard (R2=0.467 7; RMSE=2.601 8); off year (R2=0.732 4; RMSE=2.375 4). It was found that with the increase of the damage grade, the spectral characteristic index of Phyllostachys pubescens leaves changed, and the estimation accuracy of the relational model showed a trend of sharp decline at first and then slowly rising. The model had better estimation effect on SPAD of healthy and young leaves, but poor estimation effect on SPAD of light-medium-severe damaged leaves. When the relationship between SPAD and spectral characteristics of Phyllostachys pubescens leaves tends to be disordered, it indicates that the harm of Pantana phyllostachysae may occur.
作者简介: 胡新宇，1996年生，福州大学环境与安全工程学院硕士研究生 e-mail: 386311895@163. com
引用本文:
胡新宇，许章华，黄旭影，张艺伟，陈秋霞，王 琳，刘 辉，刘智才. 刚竹毒蛾胁迫下毛竹叶绿素与叶光谱特征的关系及其变化[J]. 光谱学与光谱分析, 2022, 42(09): 2726-2739.
HU Xin-yu, XU Zhang-hua, HUANG Xu-ying, ZHANG Yi-wei, CHEN Qiu-xia, WANG Lin, LIU Hui, LIU Zhi-cai. Relationship Between Chlorophyll and Leaf Spectral Characteristics and Their Changes Under the Stress of Phyllostachys Praecox. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(09): 2726-2739.
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