Influence of water supply on CO2 concentration in the rootzone of split-root potted Longan trees

Publication Type

Conference proceedings

Authors

Wiriya-Alongkorn, W.; Spreer, W.; Ongprasert, S.; Spohrer, K.; Müller, J.

Year of publication

2016

Published in

Intelligent Robotics and Applications

Pubisher

Francis & Taylor Group

Series/labeling

Lecture Notes in Computer Science

ISBN / ISSN / eISSN

978-3-319-43517-6 (print), 978-3-319-43518-3 (onli

DOI

10.1007/978-3-319-43518-3_34

Page (from - to)

346-356

Conference name

9th International Conference, ICIRA 2016

Conference location

Tokyo, Japan

Conference date

August 22-24, 2016

Keywords

Drought, partial rootzone drying, photosynthesis, Wasserstreß, water stress

Longan trees are irrigated in Thailand as fruit growth takes place during the dry season. Due to the scarcity of water resources, ways for water saving irrigation are investigated. As deficit irrigation was found to have a high water saving potential, the focus was on the investigation of plant stress responses to drought, which can be used for optimizing the deficit irrigation regime. Five split-root potted longan trees in sand culture were subjected to partial rootzone drying (PRD), and during six months the CO2 concentration in the rootzone was measured by rootzone probes and compared to a well-watered control. The CO2 efflux from the rootzone was found to be well correlated to the moisture regime in the substrate. However, it was necessary to correct the measured values by the values from the control to obtain a significant correlation between CO2 concentration and soil moisture. The main observed external factor influencing CO2 was the ambient temperature. It was shown that the CO2 efflux from the soil can be used as a non-destructive method for drought stress monitoring, but continuous measurement will be necessary to externalize disturbing environmental effects.