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http://dx.doi.org/10.5532/KJAFM.2020.22.2.57

Effects of Drought Stress and Nitrogen Fertilization on Growth and Physiological Characteristics of Pinus densiflora Seedlings Under Elevated Temperature and CO2 Concentration  

Song, Wookyung (Division of Forest Ecology and Climate Change, National Institute of Forest Science)
Lee, Bora (Division of Forest Ecology and Climate Change, National Institute of Forest Science)
Cho, Nanghyun (Department of Environmental Science, Kangwon National University)
Jung, Sungcheol (Division of Forest Ecology and Climate Change, National Institute of Forest Science)
Kim, Eun-Sook (Division of Forest Ecology and Climate Change, National Institute of Forest Science)
Lim, Jong-Hwan (Division of Forest Ecology and Climate Change, National Institute of Forest Science)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.22, no.2, 2020 , pp. 57-67 More about this Journal
Abstract
Pinus densiflora is the most widely distributed tree species in South Korea. Its ecological and socio-cultural attributes makes it one of the most important tree species in S. Korea. In recent times however, the distribution of P. densiflora has been affected by dieback. This phenomenon has largely been attributed to climate change. This study was conducted to investigate the responses of growth and physiology of P. densiflora to drought and nitrogen fertiliz ation according to the RCP 8.5 scenario. A Temperature Gradient Chamber (TGC) and CO2. Temperature Gradient Chamber (CTGC) were used to simulate climate change conditions. The treatments were established with temperature (control versus +3 and +5℃; aCeT) and CO2 (control: aCaT versus x1.6 and x2.2; eCeT), watering(control versus drought), fertilization(control versus fertilized). Net photosynthesis (Pn), stomatal conductance (gs), biomass and relative soil volumetric water content (VWC) were measured to examine physiological responses and growth. Relative soil VWC in aCeT significantly decreased after the onset of drought. Pn and gs in both aCeT and eCeT with fertiliz ation were high before drought but decreased rapidly after 7 days under drought because nitrogen fertilization effect did not last long. The fastest mortality was 46 days in aCeT and the longest survival was 56 days in eCeT after the onset of drought. Total and partial biomass (leaf, stem and root) in both aCeT and eCeT with fertiliz ation were significantly high, but significantly low in aCeT. The results of the study are helpful in addressing P. densiflora vulnerability to climate change by highlighting physiological responses related to carbon allocation under differing simulated environmental stressors.
Keywords
Climate Change; Drought; Physiology; Net photosynthetic rate; Nitrogen Fertilization;
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Times Cited By KSCI : 4  (Citation Analysis)
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