Relationships between portable chlorophyll meter estimates for the red mangrove tree (Rhizophora mangle L.)

Neres, Juliana; Dodonov, Pavel; Mielke, Marcelo Schramm; Strenzel, Gil Marcelo Reus

doi:10.1590/s2675-28242020068308

Cited by 2 publications

(1 citation statement)

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“…In mangrove studies conducted as early as 1997, Connelly reported a large correlation (R 2 > 0.6) between the chlorophyll content of mangroves and SPAD-502 readings [16]. Neres et al, (2020) also demonstrated that chlorophyll concentration indices of SPAD-502 and those of mangroves can be inter-converted [17]. Therefore, SPAD can be used to represent the leaf chlorophyll content of mangrove plants.…”

Section: Introductionmentioning

confidence: 99%

Hyperspectral Analysis and Regression Modeling of SPAD Measurements in Leaves of Three Mangrove Species

Li,

Cui,

Dou

et al. 2023

Forests

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Mangroves have important roles in regulating climate change, and in reducing the impact of wind and waves. Analysis of the chlorophyll content of mangroves is important for monitoring their health, and their conservation and management. Thus, this study aimed to apply four regression models, eXtreme Gradient Boosting (XGBoost), Random Forest (RF), Partial Least Squares (PLS) and Adaptive Boosting (AdaBoost), to study the inversion of Soil Plant Analysis Development (SPAD) values obtained from near-ground hyperspectral data of three dominant species, Bruguiera sexangula (Lour.) Poir. (B. sexangula), Ceriops tagal (Perr.) C. B. Rob. (C. tagal) and Rhizophora apiculata Blume (R. apiculata) in Qinglan Port Mangrove Nature Reserve. The accuracy of the model was evaluated using R2, RMSE, and MAE. The mean SPAD values of R. apiculata (SPADavg = 66.57), with a smaller dispersion (coefficient of variation of 6.59%), were higher than those of C. tagal (SPADavg = 61.56) and B. sexangula (SPADavg = 58.60). The first-order differential transformation of the spectral data improved the accuracy of the prediction model; R2 was mostly distributed in the interval of 0.4 to 0.8. The accuracy of the XGBoost model was less affected by species differences with the best stability, with RMSE at approximately 3.5 and MAE at approximately 2.85. This study provides a technical reference for large-scale detection and management of mangroves.

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Section: Introductionmentioning

confidence: 99%