[Effects of elevated CO2 concentration and temperature on nutrient accumulation and allocation in Betula albo-sinensis seedlings].
With enclosed chamber system, this paper studied the effects of elevated CO2 concentration (ambient + 350 micromol x mol(-1), E(C)), temperature (ambient + 2 degrees C, E(T)), and their combination (E(CT)) on the nutrient accumulation and allocation in subalpine Betula albo-sinensis seedlings in western Sichuan Province. The results showed that after a growth season, the accumulation amount of N, P and K per plant increased by 44%, 45% and 11% under E(C) (P < 0.05), by 37%, 76% and 9% under E(T) (P < 0.05), and by 24%, 88% and 20% under E(CT) (P < 0.05), respectively. The N allocation to leaves reduced by 11.68% (P < 0.05) under E(C) but increased by 11.09% (P <0.05) under E(T) while that to branches, stems and roots increased by 2.95%, 3.39% and 5.34% under E(C) (P > 0.05), but decreased by 0.69%, 10.35% and 0.05% under E(T) (P > 0.05), respectively. The N allocation pattern under E(CT) was similar to that under E(C). The allocation of P and K had greater differences under E(C), E(T) and E(CT). All of these suggested that elevated CO2 concentration and temperature could promote nutrient accumulation, and change its allocation pattern in plant organs.
Hou
Ying
Y
Shanghai Key Laboratory of Urbanization and Ecological Restoration, East China Normal University, Shanghai 200062, China. houying28@126.com
Wang
Kai-yun
KY
Zhang
Chao
C
D000388:Air / Q000032:analysis*; D029662:Betula / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D002245:Carbon Dioxide / Q000032:analysis* / Q000494:pharmacology; D002681:China; D018504:Ecological Systems, Closed; D009584:Nitrogen / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D011188:Potassium / Q000378:metabolism; D012621:Seasons; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D013696:Temperature
D002245:Carbon Dioxide; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium