麻栎种源林叶片碳、氮、磷化学计量特征的变异

Variations in leaf C,N,P stoichiometry of Quercus acutissima provenance forests

结合林木育种方法,以3个麻栎种源试验林为研究对象,测定了29个麻栎种源叶片碳、氮、磷化学计量特征.结果表明：地点（环境）显著影响叶片碳、氮、磷、碳氮比、碳磷比、氮磷比,解释量占总变异量的13.2%~66.7%,而种源（遗传）的影响并不显著,解释量只占总变异量的2.9%~11.0%.叶片氮与碳氮比、氮与氮磷比、磷与碳磷比、磷与氮磷比均具有显著的相关性,且无论是地点间还是东西部种源间均存在共同的标准化主轴斜率.表明在单一树种（麻栎）水平上,种源间具有相似的碳、氮、磷生化过程,其叶片化学计量特征主要受环境的影响;而化学计量特征在地点间和东西部种源间稳定的相关系数反映出叶片化学计量特征的特定耦合比例不受环境和种源的影响,支持化学计量学的内稳性理论.

In order to explore the variations in breeding, we determined the leaf carbon （ C）, 29 Quercus acutissima provenances grown at 3 leaf stoichiometry based on the method of forest tree nitrogen （ N）, phosphorus （P） stoichiometry among sites. The results indicated that the site （environ- ment） effect was statistically significant on leaf stoichiometry, with 13.2%-66.7% of the total varia- tions accounted for leaf C, N, P, C/N, C/P and N/P, while the provenance effect was insignifi- cant and only accounted for 2.9%-11.0% of total variations for leaf stoichiometry. The leaf N and C/N, N and N/P, P and C/P, P and N/P were significantly correlated, and the common stand- ardized major axis slope was also observed among three sites and two provenance groups. It could be concluded that the leaf stoichiometry of Q. acutissima, was mainly determined by its growing envi- ronment, due to the similar C, N and P biochemical pathways at species level. The stable correla- tion coefficients among sites and provenances implied the coupling ratios of leaf stoichiometry were independent of environment and provenance, which supported the leaf stoichiometric homeostasis.