Effects of Elevated CO2 Level and N and P Supplies on two Winter Wheat Varieties in the Early Developmental Stage

Combined Effect of Drought Stress and Elevated Atmospheric CO2 Concentration on the Yield Parameters and Water Use Properties of Winter Wheat (Triticum aestivum L.) Genotypes

“…Many experiments have also been carried out to determine the morphological and physiological responses of various plant species to the interaction between elevated CO 2 concentration and water stress, but it has become clear that the magnitude of the CO 2 effect is very difficult to predict (Bencze et al. , Harnos et al. ).…”

“…Elevated CO 2 concentration enhanced drought tolerance to a greater extent in a sensitive variety than in more tolerant genotypes; sensitive plants had a higher assimilation rate at elevated than at ambient CO 2 under moderate drought stress, while more tolerant genotypes had similar values at both CO 2 concentrations even under mild stress (Bencze et al. ).…”

Effect of Elevated CO<SUB>2</SUB> Concentration and Nitrogen Application on Translocation of Dry Matter and Nitrogen Restored before Anthesis in Winter Wheat

“…同化率增强 [7][8] , 地上部生物量增加, 有利于产量形 成和提高 [9][10][11][12][13][14][15] 。CO 2 浓度升高后, 小麦生物产量和籽 粒产量的增加主要是日净同化率和光合有效辐射提 高、灌浆前日光合有效辐射与温度的负相关性减弱 的结果 [16] 。FACE 试验结果 [14][15] 进一步表明, CO 2 浓 度升高对小麦地上部生物量的促进效应主要表现在 生育前、中期。CO 2 浓度增加也抑制了小麦对 NO 3 − 的同化 [13,17] , 降低了小麦植株不同器官氮含量, 影 响氮吸收量 [17][18][19][20][21][22] 。供氮不足时, CO 2 浓度升高对小麦 干物质积累、养分吸收和产量的影响较小 [14][15][22][23][24][25][26][27][28][29] [9,[14][15][23][24][25][26][27][28][29] 基本一致。本研究对氮素积 累的试验结果与 FACE 条件下获得的结果相符 [22,30] , 而有别于李伏生和康绍忠 [21] 前 [14][15] , 因此籽粒形成过程中可能有更多的开花前 贮存物质再分配到籽粒中, 尤其是在氮素转运很大 程度上取决于干物质量、CO 2 浓度上升又引起植株 氮素含量下降 [17][18][19]…”