Interactive effects of elevated CO2 and temperature on the leaf anatomical characteristics of eleven species
CO２浓度和温度升高对11种植物叶片解剖特征的影响

The leaf anatomical features of 11 species grown in two greenhouses with strictly controlled temperature gradients and temperature CO_2 gradients was studied. The palisade parenchyma thickness, the spongy parenchyma thickness and the total leaf thickness were studied and analyzed with the purpose of demonstrating the effect of elevated CO_2 and temperature on the leaf anatomical characteristics. The results show that with the increase of temperature, the leaf thickness of C_4 species increases while the leaf thickness of C_3 species shows no constant changes; with the increase of CO_2, seven out of nine C_3 species increase their total leaf thickness, while the C_4 species decrease their leaf thickness. As for the change-trend on the multi-grades, plants exhibit linear or curve change. With the increase of temperature or both temperature and CO_2, on the 11 chosen species, different plants, even different branches in one plant, the leaf thickness varies greatly. These facts illustrate that the effect of increasing CO_2 and temperature on plants is species-specific. Since plant structures are correlated with their functions, the changes in anatomical leaf characteristics due to the elevated temperature and CO_2 may lead to functional differences.