关键词: 蒙古栎, 种源, 生物量, 生理特征

Abstract:

In this study, the differences in the growth and physiological characteristics of one-year seedlings of five Quercus mongolica provenances were compared to provide a theoretical basis for the excellent provenance selection. The results showed that the biomass of Jiangmifeng provenances was the maximum, and the difference of its total weight and root weight was significant from the others (P <0.05). The provenance also had certain advantages in leaf area, palisade tissue thickness, photosynthetic pigment content and net photosynthetic rate (P_n) to the other provenances. Distribution of organic matter was similar among different provenances, and the proportion of root weight was biggest, accounted for more than 70% of the total, followed by the leaf weight, and then stem weight. The latter two were both less than 10% of the total weight. Q. mongolica had simple leaf structure, and the thickness of palisade tissue was from 41.99 μm to 56.89 μm. There were significant differences in leaf area, palisade tissue thickness among different provenances (P <0.05). The photosynthetic pigment content of Jiangmifeng provenances was significant differences from the others (P <0.05). The P_n was from 6.25 to 8.94 μmol·m^-2s^-1 in five provenances, and there were no significant differences between provenances. Correlation analysis showed that biomass was very significantly correlated to the photosynthetic pigment, P_n, root weight, leaf weight, palisade tissue thickness (P <0.01), and was significantly correlated to the leaf area. In a word, there were significant or very significant differences in growth and physiological characteristics, the genetic resources of Q. mongolica were very rich and Jiangmifeng provenances had a greater potential value than the others.

Key words: Quercus mongolica, provenances, biomass, physiological characteristics