Changes in growth, photosynthetic parameters, carbon and nitrogen uptake of Pinus densiflora S. et Z. under elevated temperature and CO2 level

被引:0
|
作者
Ultra, Venecio U., Jr. [1 ]
Han, Sim-Hee [1 ]
Kim, Du-Hyun [1 ]
Aggangan, Nelly S. [2 ]
机构
[1] Korea Forest Res Inst, Dept Forest Genet Resources, Suwon 441350, South Korea
[2] Univ Philippines Los Banos, Natl Inst Mol Biol & Biotechnol, College Los Banos 4031, Laguna, Philippines
来源
ASIA LIFE SCIENCES | 2012年 / 21卷 / 02期
关键词
Pinus densiflora; Korean red pine; stomatal conductance; carboxylation efficiency; photorespiration rate; relative growth rate; source/sink imbalance; carbon uptake; nitrogen uptake; STOMATAL CONDUCTANCE; ATMOSPHERIC CO2; DIOXIDE CONCENTRATION; RESPONSES; EXPOSURE; FOREST; ENRICHMENT; TRANSPIRATION; CANOPY; LEAVES;
D O I
暂无
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
The effects of two (25 and 30 degrees C) temperature setting and CO2 (400 and 800 ppm) levels on growth, photosynthetic parameters, and carbon and nitrogen uptake of one-year-old Pinus densiflora S. et Z. were investigated in order to obtain information on the acclimation of forest tree species to elevated temperature and CO2 concentration. Relative growth rate (RGR) of height at the same CO2 level was higher in plants grown at higher temperature (30 degrees C), and RGR of root collar diameter at the same temperature was increased by elevated CO2 (800 mu mol CO2 mol(-1) air). In addition, dry matter yield was enhanced under higher temperature and CO2 level, and the increase of shoot/root ratio was observed under higher temperature but not at higher CO2 level. Photosynthetic rates measured at 400 and 800 mu mol CO2 mol(-1) air were not affected by elevated temperature and CO2. However, stomatal conductance and transpiration rate increased with elevated temperature and CO2, whereas carboxylation efficiency and photorespiration rate were reduced by elevated temperature. Total carbon and nitrogen uptake increased with elevated temperature regardless of CO2 level. Shoot/root ratio of carbon uptake increased by elevated CO2 regardless of temperature level. In conclusion, the elevated temperature and CO2 level increased dry matter and carbon uptake without the changes of photosynthetic rate, but the increase of carbon uptake in the needles led to a source/sink imbalance.
引用
收藏
页码:523 / 536
页数:14
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