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24. Feasibility of Using Rice Leaves Hyperspectral Data to Estimate CaCl2-extractable Concentrations of Heavy Metals in Agricultural Soil.

Author

Zhou, Weihong, Zhang, Jingjing, Zou, Mengmeng, Liu, Xiaoqing, Du, Xiaolong, Wang, Qian, Liu, Yangyang, Liu, Ying, and Li, Jianlong

Subjects
RICE, HEAVY metal toxicology, CHLOROPHYLL, CADMIUM, LEAST squares
Abstract

Heavy metals contamination is a serious problem of China. It is necessary to estimate bioavailability concentrations of heavy metals in agricultural soil for keeping the food security and human health. This study aimed to use hyperspectral data of rice (Oryza sativa) leaves as an indicator to retrieve the CaCl2-extractable concentrations of heavy metals in agricultural soil. Twenty-one rice samples, soil samples and reflectance spectra of rice leaves were collected, respectively. The potential relations between hyperspectral data and CaCl2-extractable heavy metals (E-HM) were explored. The partial least-squares regression (PLSR) method with leave-one-out cross-validation has been used to predict concentrations of CaCl2-extractable cadmium (E-Cd) and concentrations of CaCl2-extractable lead (E-Pb) in farmland soil. The results showed that the concentrations of E-Cd in soil had significant correlation with concentrations of Cd in rice leaves; the number of bands associated with E-Cd was more than that of E-Pb. Four indices (normalized difference vegetation index (NDVI), carotenoid reflectance index (CRI), photochemical reflectance index 2 (PRI2), normalized pigments chlorophyll ratio index (NPCI)) were significant (P < 0.05) and negatively related to the E-Cd concentrations. The PLSR model of E-Cd concentrations performed better than the PLSR model of E-Pb concentrations, which with R2 = 0.592 and RMSE = 0.046. We conclude that if the rice was sensitive to E-HM and/or the crop was stressed by the E-HM, the hyperspectral data of field rice leaves hold potentials in estimating concentration of E-HM in farmland soil. Therefore, this method provides a new insight to monitoring the E-HM content in agricultural soil. [ABSTRACT FROM AUTHOR]

Published
2019
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25. Commemoration of 40 Years of Sino-Mexican Diplomatic Ties.

Author

An Xinzhu and Zou Mengmeng

Subjects
*PHOTOGRAPH albums, CHINESE foreign relations, 1976-, MEXICAN foreign relations, 2000-
Abstract

The article reports on the launching of the photo album "Go Forward Hand in Hand - Commemorating the 40th Anniversary of Sino-Mexican Diplomatic Ties" in Mexico City, Mexico on March 26, 2012. Published by China International Publishing Group (CIPG), the album shows the cooperation between Mexico and China in the past 40 years. he vent was attended to by notable people including CIPG president Zhou Mingwei and Asia-Pacific Committee of the Senate of Mexico president Carlos Jimenez.

Published
2012

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