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CROP WATER STRESS INDEX AS OVERDRYING INDICATOR OF WETLAND HABITATS

J. Chormanski, W. Ciezkowski, M. Goraj, M. Kleniewska, P. Sikorski
Wednesday 19 December 2018 by Libadmin2018

ABSTRACT

Wetland habitats, such as transition mires and quaking bogs (habitat code 7140) and alkaline fens (habitat code 7230), are characterized by the occurrence of species sensitive to the water stress. The prolonged period of water shortage is manifested by a change in the structure of domination, species composition and, as a consequence, the reconstruction of the entire habitat. Due to the fact, that habitat is not homogeneous and varied very much depends on geomorphological position a monitoring of the water stress in wetland habitats needs a method which gives as result spatial distribution of water stress indicator, as remote sensing can. Crop Water Stress Index (CWSI) is an indicator developed for arable lands, based on thermal infrared imaging (TIR) as well as air temperature and humidity measurement. It allows the identification of water stress in plant communities based on the ratio between the real and potential evaporation. Wetland habitats such as 7140 and 7230 have a multi-species structure. The aim of this research was to investigate the relationship between the CWSI and the plants condition occurring within the habitat patches 7140 and 7230 and an attempt to adapt this indicator for detection of the overdrying. Plant blocks with plants cover were collected, laboratory measurements were made, including sample weight, air temperature and humidity, reflectance, chlorophyll content, as well as visible (VIS), near infrared (NIR) and TIR imaging. Based on the collected data, the CWSI thresholds have been designated at which overdrying is identified.

Keywords: CWSI, drought, Natura 2000, thermal remote sensing, wetlands


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