Abstract
Studies on evapotranspiration (ET) by considering water retention layer have been rarely conducted. This study primarily aimed to examine the effect of vegetation treatment, substrate characteristics, and water retention layers on the ET characteristics exhibited by extensive green roofs. The present study was supported by the 5-month continuous field monitoring of the moisture content, actual daily evapotranspiration (AET), leaf area index as well as stomatal conductance values in 4 green roofs buckets. As indicated from the results, (1) the average AET of Sudem lineare (4.1 mm/day) exceeded that of Ophiopogon japonicus (3.3 mm/day) in a nearly 7 days of dry event. (2) Peat modified substrate and biochar modified substrate exhibited consistent water-movement behaviors. (3) The decrease in stomatal conductance of vegetation in water retention layer system was the minimal after the 13-day drying. (4) The declining rate of water content in the green roof sbustrate can be decreased by water evaporation from the water retention layer. Furthermore, the water retention layer system would begin to significantly facilitate the AET when the dry period exceeded 8 days in autumn. The AET rate can be increased by setting the water retention layer in green roof and it is 6 times higher in the autumn than that in the winter.
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Acknowledgements
The study was supported by National Natural Science Foundation of China (grant no. 52178321, 41867034, and 51878185) and Innovative Research Team Program of Guangxi Natural Science Foundation (grant no. 2016GXNSFGA380008).
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Liu, J., Garg, A., Wang, J. et al. Evapotranspiration characteristics in extensive green roofs during dry periods: the influences of vegetation treatment, substrate characteristics, and water retention layer. Arab J Geosci 15, 1562 (2022). https://doi.org/10.1007/s12517-022-10820-0
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DOI: https://doi.org/10.1007/s12517-022-10820-0