Developing an integrated index based on phenological metrics for evaluating cadmium stress in rice using Sentinel-2 data

Ning Sun; Ping Wang; Fang Huang; Bo Li

doi:10.1117/1.JRS.12.036018

24 September 2018 Developing an integrated index based on phenological metrics for evaluating cadmium stress in rice using Sentinel-2 data

Ning Sun, Ping Wang, Fang Huang, Bo Li

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 12, Issue 3, 036018 (September 2018). https://doi.org/10.1117/1.JRS.12.036018

Abstract

Effectively assessing cadmium (Cd) contamination in crops is crucial for the sustainable development of an agricultural ecosystem and for environmental security. We developed an integrated stress index (SI) based on two phenological metrics to effectively evaluate Cd stress in rice crops. The selected four experimental areas are located in Zhuzhou City, Hunan Province, China. Six Sentinel-2 images were acquired in 2017, and heavy metal concentrations in soil were measured. The change rate of CIre (CRCIre) and the time-integrated CIre (TICIre) were obtained from daily red-edge chlorophyll index (CIre) time-series using Sentinel-2 data. The CRCIre and TICIre were used to characterize the photosynthetic rate and biomass, respectively. SI was calculated by Fisher discriminant analysis based on CRCIre and TICIre from two experimental areas, and it was verified using another two experimental areas. The results were the following: (i) when SI ≥ 0, rice was under mild stress and when SI < 0, rice was under severe stress. (ii) The SI effectively evaluated Cd stress levels with an overall discriminatory accuracy of 86.02%. This research provides a potential new method to evaluate Cd stress in rice by remote sensing through phenology.

Citation Download Citation

Ning Sun, Ping Wang, Fang Huang, and Bo Li "Developing an integrated index based on phenological metrics for evaluating cadmium stress in rice using Sentinel-2 data," Journal of Applied Remote Sensing 12(3), 036018 (24 September 2018). https://doi.org/10.1117/1.JRS.12.036018

Received: 25 June 2018; Accepted: 27 August 2018; Published: 24 September 2018

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available