文献类型：期刊文献

英文题名：Hyperspectral inversion of Phragmites communis carbon, nitrogen, and phosphorus stoichiometry using three models

作者：Cui, Lijuan[1,2] Dou, Zhiguo[1,2] Liu, Zhijun[1,2] Zuo, Xueyan[1,2] Lei, Yinru[1,2] Li, Jing[1,2] Zhao, Xinsheng[1,2] Zhai, Xiajie[1,2] Pan, Xu[1,2] Li, Wei[1,2]

第一作者：Cui, Lijuan

通信作者：Li, Wei|[a0005177660f5265f39c9]李卫;

机构：[1] Institute of Wetland Research, Chinese Academy of Forestry, Beijing Key Laboratory ofWetland Services and Restoration, Beijing, 100091, China; [2] Beijing Hanshiqiao National Wetland Ecosystem Research Station, Beijing, 101399, China

年份：2020

卷号：12

期号：12

外文期刊名：Remote Sensing

收录：EI(收录号：20202708886185);Scopus(收录号：2-s2.0-85087000680)

语种：英文

外文关键词：Backpropagation - Carbon - Decision trees - Errors - Forecasting - Mean square error - Neural networks - Nitrogen - Phosphorus - Stoichiometry - Wetlands

摘要：Studying the stoichiometric characteristics of plant C, N, and P is an effective way of understanding plant survival and adaptation strategies. In this study, 60 fixed plots and 120 random plots were set up in a reed-swamp wetland, and the canopy spectral data were collected in order to analyze the stoichiometric characteristics of C, N, and P across all four seasons. Three machine models (random forest, RF; support vector machine, SVM; and back propagation neural network, BPNN) were used to study the stoichiometric characteristics of these elements via hyperspectral inversion. The results showed significant differences in these characteristics across seasons. The RF model had the highest prediction accuracy concerning the stoichiometric properties of C, N, and P. The R2 of the four-season models was greater than 0.88, 0.95, 0.97, and 0.92, respectively. According to the root mean square error (RMSE) results, the model error of total C (TC) inversion is the smallest, and that of C/N inversion is the largest. The SVM yielded poor predictive results for the stoichiometric properties of C, N, and P. The R2 of the four-season models was greater than 0.82, 0.81, 0.81, and 0.70, respectively. According to RMSE results, the model error of TC inversion is the smallest, and that of C/P inversion is the largest. The BPNN yielded high stoichiometric prediction accuracy. The R2 of the four-season models was greater than 0.87, 0.96, 0.84, and 0.90, respectively. According to RMSE results, the model error of TC inversion is the smallest, and that of C/P inversion is the largest. The accuracy and stability of the results were verified by comprehensive analysis. The RF model showed the greatest prediction stability, followed by the BPNN and then the SVM models. The results indicate that the accuracy and stability of the RF model were the highest. Hyperspectral data can be used to accurately invert the stoichiometric characteristics of C, N, and P in wetland plants. It provides a scientific basis for the long-term dynamic monitoring of plant stoichiometry through hyperspectral data in the future. ? 2020 by the authors.