TY - JOUR
T1 - Physiological and growth responses to experimental warming in first-year seedlings of deciduous tree species
AU - An, Jiae
AU - Han, Saerom
AU - Chang, Hanna
AU - Park, Min Ji
AU - Kim, Seongjun
AU - Hwang, Jaehong
AU - Cho, Min Seok
AU - Chung, Haegeun
AU - Son, Yowhan
N1 - Funding Information:
This study was carried out with the support of Forest Science & Technology Projects provided by the Korea Forest Service (S111115L030100).
Publisher Copyright:
© TÜBİTAK.
PY - 2017
Y1 - 2017
N2 - Increasing temperature might affect physiological and growth traits of seedlings, which are particularly important for tree survival. This study was conducted to investigate the physiological and growth responses of first-year seedlings to open-field experimental warming during one growing season. Seedlings of three deciduous tree species (Fraxinus rhynchophylla Hance, Zelkova serrata (Thunb.) Makino, and Quercus variabilis Blume) were warmed with infrared heaters with a mean air temperature difference of 3.07 °C between the treatments. Physiological traits (net photosynthetic rate, transpiration rate, stomatal conductance, and total chlorophyll content) were measured in July, September, and October 2014, and growth traits (root collar diameter (RCD), shoot length, component biomass, and root mass to stem mass ratio (RSR)) were measured in June, August, and October 2014 for harvested seedlings. Net photosynthetic rate, transpiration rate, and stomatal conductance were not affected by the warming treatment, whereas total chlorophyll content increased. Shoot length, leaf biomass, and stem biomass were enhanced under the warming treatment, whereas RCD and root biomass did not differ between the treatments. Thus, relative root growth declined under the warming treatment. It is likely that the elevated temperature provides optimal conditions for the biosynthesis of chlorophyll. Moreover, seedlings allocated more carbon to aboveground growth than to belowground growth when temperatures were elevated. In contrast, net photosynthetic rate, transpiration rate, and stomatal conductance were hindered, failing to increase as an adaptive mechanism to warming-induced water stress. Further studies are needed to elucidate (1) the direct effect of a decline in soil moisture, (2) why RSR declines to different extents in different species, and (3) the relationship between decreased root growth and seedling survival under the warming treatment.
AB - Increasing temperature might affect physiological and growth traits of seedlings, which are particularly important for tree survival. This study was conducted to investigate the physiological and growth responses of first-year seedlings to open-field experimental warming during one growing season. Seedlings of three deciduous tree species (Fraxinus rhynchophylla Hance, Zelkova serrata (Thunb.) Makino, and Quercus variabilis Blume) were warmed with infrared heaters with a mean air temperature difference of 3.07 °C between the treatments. Physiological traits (net photosynthetic rate, transpiration rate, stomatal conductance, and total chlorophyll content) were measured in July, September, and October 2014, and growth traits (root collar diameter (RCD), shoot length, component biomass, and root mass to stem mass ratio (RSR)) were measured in June, August, and October 2014 for harvested seedlings. Net photosynthetic rate, transpiration rate, and stomatal conductance were not affected by the warming treatment, whereas total chlorophyll content increased. Shoot length, leaf biomass, and stem biomass were enhanced under the warming treatment, whereas RCD and root biomass did not differ between the treatments. Thus, relative root growth declined under the warming treatment. It is likely that the elevated temperature provides optimal conditions for the biosynthesis of chlorophyll. Moreover, seedlings allocated more carbon to aboveground growth than to belowground growth when temperatures were elevated. In contrast, net photosynthetic rate, transpiration rate, and stomatal conductance were hindered, failing to increase as an adaptive mechanism to warming-induced water stress. Further studies are needed to elucidate (1) the direct effect of a decline in soil moisture, (2) why RSR declines to different extents in different species, and (3) the relationship between decreased root growth and seedling survival under the warming treatment.
KW - Ash
KW - Experimental warming
KW - Japanese zelkova
KW - Oriental oak
KW - Seedling growth
UR - http://www.scopus.com/inward/record.url?scp=85020930141&partnerID=8YFLogxK
U2 - 10.3906/tar-1611-106
DO - 10.3906/tar-1611-106
M3 - Article
AN - SCOPUS:85020930141
SN - 1300-011X
VL - 41
SP - 175
EP - 182
JO - Turk Tarim ve Ormancilik Dergisi/Turkish Journal of Agriculture and Forestry
JF - Turk Tarim ve Ormancilik Dergisi/Turkish Journal of Agriculture and Forestry
IS - 3
ER -