Spectral Characteristics of Moso Bamboo Leaves Damaged by Pantana Phyllostachysae Chao and Monitoring of Pest Rating
HUANG Xu-ying1, XU Zhang-hua2, 3, WANG Xiao-ping1, YANG Xu1, JU Wei-min1*, HU Xin-yu2, LI Kai3, 4, CHEN Yun-zhi3, 4
1. International Institute for Earth System Science, Nanjing University, Nanjing 210023, China
2. College of Environment and Resources, Fuzhou University, Fuzhou 350116, China
3. Key Laboratory of Spatial Data Mining and Information Sharing of Ministry of Education, Fuzhou 350116, China
4. National & Local Joint Engineering Research Center of Satellite Geospatial Information Technology, Fuzhou University, Fuzhou 350116, China
Abstract：Understanding the spectral characteristics of moso bamboo leaves damaged by Pantana phyllostachysae Chao can provide theoretical guidance for developing applicable and effective technologies to monitor the ecological safety of the bamboo forest. Compared with the traditional multispectral data, hyperspectral remote sensing can sense the subtle changes of host spectrum among different severity of Pantana phyllostachysae Chao. However, the related researches were still rare, and the spectral change mechanism of the host needs to be further summarized. Therefore, this study analyzed the spectral differences among healthy, damaged and off-yearmoso bamboo leaves based on 552 field measured spectrums. The characteristic variables that can act as indicators of leaves health status were selected. Finally, the model for monitoring the damage of leaves caused by Pantana phyllostachysae Chao was established using the XGBoost algorithm. The results show that: (1) with the increase of pest damage, the reflectance of damaged leaves gradually appeared “green low and red high” in visible-band, while the reflectance noticeably decreased in near-infrared band, and the reflectance of damaged leaves in shortwave infrared band was significantly higher than that of healthy leaves, especially in the two typical water vapor absorption bands (1 450 and 1 940 nm); (2) the reflectance of off-year leaves in visible and near infrared bands was significantly higher than healthy and damaged leaves; (3) the spectral characteristics of indentation-only leaves only slightly changed in comparison with healthy leaves, while the red band reflectance of leaves with red-brown disease spots increased to some extent, andthe leaves with gray-white disease spots completely lost the basic spectral characteristics of vegetation; (4) according to the feature importance score determined by the XGBoost algorithm, the contribution of each characteristic variable was PRI＞FDVI576, 717＞NPCI＞DSWI＞VOG 1＞RVSI＞NDWI; (5) the overall average accuracy of the model to detect the damage by the pest was 74.39%, and the accuracy for healthy, mild damaged, severe damaged, off-year, and moderate damaged leaves was 94.55%, 74.93%, 84.12%, 71.10%, and 33.48%, respectively.
黄旭影，许章华，王小平，杨 旭，居为民，胡新宇，李 凯，陈芸芝. 刚竹毒蛾危害下的毛竹叶片光谱特征及虫害等级检测研究[J]. 光谱学与光谱分析, 2021, 41(04): 1253-1259.
HUANG Xu-ying, XU Zhang-hua, WANG Xiao-ping, YANG Xu, JU Wei-min, HU Xin-yu, LI Kai, CHEN Yun-zhi. Spectral Characteristics of Moso Bamboo Leaves Damaged by Pantana Phyllostachysae Chao and Monitoring of Pest Rating. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(04): 1253-1259.
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