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Lee, T.Y.,Je, S.M.,Kwak, M.J.,Akhmadi, K.,Tumurbaatar, E.,Khaine, I.,Lee, H.K.,Jang, J.H.,Kim, H.N.,Ahn, H.J.,Woo, S.Y. Elsevier 2017 South African journal of botany : official journal Vol.112 No.-
<P><B>Abstract</B></P> <P>This study was conducted in Elsen tasarkhai, an arid region in Mongolia, to investigate the physiological response of <I>Populus sibirica</I> to different irrigation regimes and to suggest optimal irrigation intervals for successful reforestation in Mongolia. Two-year-old <I>P. sibirica</I> seedlings were planted, and three different irrigation regimes (well-watered (WW), irrigation every 2days; moderate drought (MD), irrigation every 5days; severe drought (SD), irrigation every 7days) were applied. Although the survival rate was unaffected by the applied water deficit intensity, the relative growth rate was significantly reduced in SD in accordance with a decline in carbon assimilation. Although the total chlorophyll content also decreased as the water deficit increased, the chlorophyll b (Chl b) and total carotenoid (Car T) levels increased to dissipate the excess energy. Increased quantum efficiencies in the SD condition were caused by the enlargement of the reaction center (RC) antenne, indicating increased of excess energy dissipation. Therefore, <I>P. sibirica</I> showed resistance to a certain degree of water deficit intensity (MD and SD). The irrigation regime of SD appeared to be adequate for <I>P. sibirica</I> based on survival rate and physiological traits. These results might enlighten the development of effective irrigation systems in arid area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The biological activities of <I>Populus sibirica</I> was reviewed. </LI> <LI> The reduced carbon assimilation rate was caused by stomatal limitation. </LI> <LI> <I>Populus sibirica</I> prevented photodamage through the dissipation of excess energy. </LI> <LI> Irrigation every 7days could be recommended in this study. </LI> </UL> </P>
Plant diversity in different bioclimatic zones in Tunisia
You, H.,Jin, H.,Khaldi, A.,Kwak, M.,Lee, T.,Khaine, I.,Jang, J.,Lee, H.,Kim, I.,Ahn, T.,Song, J.,Song, Y.,Khorchani, A.,Stiti, B.,Woo, S. Korean Biodiversity Information Facility 2016 Journal of Asia-Pacific biodiversity(Online) Vol.9 No.1
The Republic of Tunisia, located in northern Africa, faces various environmental challenges caused by anthropogenic practices such as overgrazing, deforestation, and desertification. The conversion of natural ecosystems is the major cause of plant biodiversity loss. Tunisia can be divided into three main climatic zones as follows: a northern Mediterranean climate zone, a central steppe climate zone, and a southern desert climate zone. Because of this great environmental diversity, there are distinctive vegetation and various genetic resources in Tunisia. This research was conducted to investigate plant biodiversity within the various bioclimatic zones and to characterize useful plant resources in Tunisia. We investigated native, medicinal and aromatic, desert, and soil erosion control plant species.
Why does Quercus suber species decline in Mediterranean areas?
Kim, H.N.,Jin, H.Y.,Kwak, M.J.,Khaine, I.,You, H.N.,Lee, T.Y.,Ahn, T.H.,Woo, S.Y. Korean Biodiversity Information Facility 2017 Journal of Asia-Pacific Biodiversity Vol.10 No.3
The cork oak (Quercus suber L.) is a prevalent tree species in the Mediterranean climate zones of western Europe and north Africa with a quite narrow geographical range of distribution, as compared with the other Mediterranean evergreen oak species such as Quercus calliprinos (holly oak) and Quercus ilex (holm oak). This species offers the ecological, economic and social importance, including their biodiversity and sustainable forest production in these areas. The increase of mean annual temperature and rainfall extremes during recent decades follows the trends predicted by present climate change models projecting a higher frequency of droughts and intense rain events in the Mediterranean climate areas. Nevertheless, various biotic and abiotic factors, including climate change (increased frequency and rigor of high temperature and drought) and related physiological decline of trees, increases in the outbreaks of disease, and an excessive development of forest resources has been recognized as main factors to induce a cork oak forest decline. In general, sustainable cork oak forest management and proper agroforestry activity that can generate income for local people through local community participation would be the ways to prevent cork oak forest decline in northern Tunisia.