八角林病虫害遥感识别模型

doi:10.11707/j.1001-7488.LYKX20230559

Abstract

Abstract:

Objective: Weak spectral signals induced by pest and disease stress are often obscured by spectral variations caused by vegetation phenology. This study investigates a forest pest and disease monitoring method that enhances weak spectral signals related to vegetation stress, aiming to provide a scientific basis for the prevention and management of forest pests and diseases. Method: Illicium verum was selected as the study species, with Leye County in the Guangxi Zhuang Autonomous Region designated as the experimental area. Sentinel-2 imagery data from 2019 to 2021 were collected for this region. Initially, six vegetation indices sensitive to pest and disease stress responses were selected as preliminary indicators for Illicium verum pest and disease stress: the normalized difference vegetation index (NDVI₇₀₅), red edge position index (REPI), chlorophyll reflectance red-edge index (CI_red-edge), plant senescence reflectance index (PSRI), pigment-specific simple ratio chlorophyll index (PSSRA), and fraction of absorbed photosynthetically active radiation (FAPAR). The Savitzky-Golay (S-G) filtering method was then employed to construct time series curves of these spectral indices. PSRI and FAPAR were identified as the most effective indices for comprehensively characterizing morphological color and physiological changes induced by pest and disease stress in Illicium verum. The Seasonal-Trend decomposition using LOESS (STL) method was applied to decompose the time series of FAPAR and PSRI indices, allowing for the isolation of seasonal components. This facilitated the construction of the Illicium verum Pest and Disease Index (IPDI) by integrating the seasonally adjusted FAPAR and PSRI components. Finally, a monitoring model for pest and disease stress in Illicium verum was developed using the Random Forest algorithm. Result: 1) Compared to healthy vegetation, Illicium verum plantations under pest and disease stress exhibited lower FAPAR and higher PSRI values. 2) The STL method effectively isolates the influence of phenological changes on parameters sensitive to vegetation stress from pests and diseases, thereby enhancing the sensitivity of Illicium verum to stress detection. 3) The remote sensing identification model based on IPDI demonstrated high accuracy, with kappa coefficients and overall accuracies from 2019 to 2021 of 0.81, 0.84, and 0.80, and 87.59%, 88.51%, and 84.17%, respectively. In 2020, the relative error between the remote sensing-calculated damage area of Illicium verum and the statistical disaster area was 2.08%. Conclusion: The method based on enhancing weak spectral signals from vegetation stress effectively monitors the distribution of pest and disease stress in Illicium verum forests. This approach significantly improves control efficiency and supports the sustainable management and ecological conservation of these forests.

Key words: disease and insect stresses, seasonal trend loss method, Sentinel-2 image, spectral index, Illicium verum forest

CLC Number:

S757

Meiqi Li,Meiling Liu,Xuan Wang,Xiangnan Liu,Ling Wu,Junji Li. Remote Sensing Recognition Model of Illicium verum Forest Pests and Diseases[J]. Scientia Silvae Sinicae, 2024, 60(11): 128-138.

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受害程度Damage degree	分级标准 Classification standard
健康Healthy	植株健康，基本无受害情况 The plants are healthy, with negligible signs of damage
轻度Mild	植株枝、叶轻度受损，病害率小于15%；虫口密度每株5~13条 The plants show minor branch and leaf damage, with a disease incidence of less than 15%, and an insect density of 5 to 13 per plant
中度Moderate	植株枝、叶明显受损，病害率在15%-45%之间；虫口密度每株14~30条 The plants show substantial branch and leaf damage, with a disease incidence between 15% and 45%, and an insect density of 14 to 30 per plant
重度Severe	植株枝、叶严重受损，病害率大于45%；虫口密度每株31条以上 The plants show severe branch and leaf damage, with a disease incidence exceeding 45%, and an insect density of over 31 per plant

光谱指数 Spectra index	全称 Full name	表达式 Formula	参考文献 Reference
NDVI₇₀₅	红边归一化差异植被指数Normalized difference vegetation index[705,750]	$ {\text{NDVI}}_{\text{705}}\text{=(}{\rho}_{\text{RED2}}{-}{\rho}_{\text{RED1}}\text{)/(}{\rho}_{\text{RED2}}\text{+}{\rho}_{\text{RED1}}\text{)} $	Gamon et al., 1999
REPI	红边位置指数Red edge position index	$ \text{REPI=705+}\left[\text{35}\left(\dfrac{{\rho}_{\text{NIR}}\text{+}{\rho}_{\text{RED}}}{\text{2}}{-}{\rho}_{\text{RED1}}\right)\right]\text{/(}{\rho}_{\text{RED2}}{-}{\rho}_{\text{RED1}}\text{)} $	Frampton et al., 2013
CI_red-edge	红边叶绿素指数Chlorophyll reflectance red-edge index	$ {\text{CI}}_{\text{red-edge}}\text{=}{\rho}_{\text{RED3}}\text{/}{\rho}_{\text{RED1}}{-1} $	Gitelson et al., 2003
PSRI	植被衰减指数Plant senescence reflectance index	$ \text{PSRI=(}{\rho}_{\text{RED}}{-}{\rho}_{\text{BLUE}}\text{)/}{\rho}_{\text{RED2}} $	Merzlyak et al., 1999
PSSRA	特征色素简单比值指数 Pigment specific simple ratio chlorophyll index	$ \text{PSSRA=}{\rho}_{\text{NIR}}\text{/}{\rho}_{\text{RED}} $	Blackburn, 1998
FAPAR	植被光合有效辐射吸收系数Fraction of absorbed photosynthetically active radiation	欧空局SNAP开源平台反演European Space Agency SNAP open source platform inversion	Sellers et al., 1997

指标Index	精度Accuracy
指标Index	2019	2020	2021
生产者精度Producer accuracy(%)	88.92*	85.47*	86.17*
用户精度User accuracy(%)	88.38*	92.09*	85.22*
总体精度Overall accuracy(%)	87.59*	88.51*	84.17*
Kappa	0.81	0.84	0.80

指标Index	精度Accuracy
指标Index	季节性剥离前Before seasonal stripping	季节性剥离后After seasonal stripping
总体精度Overall accuracy(%)	72.31	84.72
Kappa	0.56	0.78

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Remote Sensing Recognition Model of Illicium verum Forest Pests and Diseases

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