Assessing the effect of extra nitrogen on Kandelia obovata growth under cadmium stress using high-resolution thermal infrared remote sensing and the three-temperature model
Xiaoxue Shen
A , Ruili Li A C , Minwei Chai A , Ke Yu A , Qijie Zan B and Guo Yu Qiu A
+ Author Affiliations
- Author Affiliations
A School of Environment and Energy, Peking University, Shenzhen, Guangdong, 518055, China.
B Guangdong Neilingding Futian National Nature Reserve, Shenzhen 518000, China.
C Corresponding author. Email: liruili@pkusz.edu.cn
Functional Plant Biology 45(11) 1162-1171 https://doi.org/10.1071/FP17295
Submitted: 23 October 2017 Accepted: 12 June 2018 Published: 18 July 2018
Abstract
Mangrove forests provide many ecological services and are among the most productive intertidal ecosystems on earth. Currently, these forests frequently face significant heavy metal pollution as well as eutrophication. The present study assessed the response of Kandelia obovata Sheue, H.Y. Liu & J. Yong to combined NH4+–N addition and Cd stress based on a three-temperature (3T) model using high-resolution thermal infrared remote sensing. The results show that leaf surface temperature (Tc) and the plant transpiration transfer coefficient (hat) became larger with increasing NH4+–N concentrations in the same Cd treatment, especially under high NH4+–N (50 and 100 mg·L−1) and Cd stress. The thermal bioindicators, growth responses and photosynthetic parameters changed in a consistent fashion, indicating that combined high NH4+–N addition and Cd stress led to stomatal closure, reduced the cooling effect of transpiration, and increased Tc and hat values. Furthermore, appropriate NH4+–N supply reduced stomatal conductance (gs) and the transpiration rate (Tr), which were increased by Cd stress, and then maintained Tc and hat at normal levels. The normalised hat helped to reduce the influence of environmental variation during the diagnosis of mangrove plant health. This indicated that the 3T model with high-resolution thermal infrared remote sensing provides an effective technique for determining the health status of mangrove plants under stress.
Additional keywords: ammonium supply, heavy metal stress, infrared thermography, mangrove forest, photosynthetic parameters, plant transpiration transfer coefficient.
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