Effect of combined water and salinity stress factors on evapotranspiration of Sedum kamtschaticum Fischer in relation to green roof irrigation |
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| Authors: | Shigeoki Moritani Tahei Yamamoto Henintsoa Andry Mitsuhiro Inoue Koh Kato Hirotaka Saito |
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| Institution: | 1. Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki, Aomori, Japan;2. Arid Land Research Center, Tottori University, Hamasaka 1390, Tottori, Japan;3. Department of Ecoregion Science, Tokyo University of Agriculture and Technology, Fuchu, Tokyo, Japan;1. School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa;2. School of Life Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa;3. Randles Nursery, eThekwini Municipality, 62 Burnwood Road, Sydenham, Durban 4091, South Africa;1. Debre Markos University, Department of Natural Resource Management, P.O. Box 269, Ethiopia;2. Ethiopian Institute of Architecture, Building Construction and City Development (EiABC), Addis Ababa University, P.O. Box 518, Ethiopia;1. Technische Universität Berlin, Department of Ecology, Rothenburgstr. 12, 12165 Berlin, Germany;2. Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), 14195 Berlin, Germany;1. Research Institute for Agriculture and Life Sciences, Room 7215, Building 200, College of Agriculture and Life Science, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-921, Republic of Korea;2. Department of Forest Sciences, Room 7219, Building 200, College of Agriculture and Life Science, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-921, Republic of Korea |
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| Abstract: | In dryland areas, secondarily treated municipal wastewater could be used in extensive green roof systems. In this study, the effects of water and salt stress on a crassulacean acid metabolism (CAM) plant, Sedum kamtschaticum Fischer, was evaluated under intermittent saline irrigation. The salinity of irrigation water varied from 6.0 to 18.0 dS m?1. A reduction in soil water content and an increase in soil water electrical conductivity (EC) were observed during the irrigation interval (5–17 d) as a result of evapotranspiration (ET). The effect of soil water potential (SWP) on reduction of the ET ratio (ETr) was successfully described with an equation that could be applicable to a wide range of soil salinities and water contents, to estimate ET. In this study, the stress factor was defined as the integration of solute potential, and matric potential less soil water content for optimum growth (less than ?0.1 MPa) with elapsed time. The stress factor rapidly reduced total ET in CAM plants but effectively increased water-use efficiency (WUE). Thus, by using CAM plants for green roofs under intermittent saline irrigation, the need for irrigation water is reduced without a considerable loss of plant biomass. |
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| Keywords: | Intermittent saline irrigation Soil water potential Stress factor Water-use efficiency |
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