四种乡土珍贵阔叶树种叶功能性状的种内和种间变异

植物功能性状种间性状变异反映不同物种的生活史对策,种内性状变异反映了同一物种不同个体应对不同环境的性状应答.人工林均一的环境有利于深入分析不同树种种内和种间变异.该研究以南宁良凤江林场的四种乡土珍贵阔叶树种[观光木(Tsoongiodendron odorum)、红锥(Castanopsis hystrix)、灰木莲(...

Interspecific and intraspecific variation in leaf functional traits of four local precious hardwood species

Interspecific trait variation of functional traits in plants reflects the life history strategies of different species, and intraspecific trait variation reflects the responses of different individuals of the same species to different environments. The homogeneous environment of plantation is conducive to the in-depth analysis of intraspecific and interspecific variation of different trees. In this study, the intraspecific and interspecific variations of four native and precious hardwood species(Tsoongiodendron odorum, Castanopsis hystrix, Magnolia blumei, and Parashorea chinensis)in Liangfengjiang Forest plantation were studied. The results were as follows:(1)Most of the leaves of four plants of the same height had significant differences in functional traits, but only a few leaves had no significant differences in functional traits. Compared with the other three plants, the Castanopsis hystrix has lower leaf fresh weight, leaf thickness, leaf area, leaf dry weight, specific leaf area and leaf water content, but the C. hystrix has higher specific leaf weight, leaf dry matter content and leaf tissue density.(2)There were differences in leaf functional traits of the same tree species at different heights, and the differences in tree species were different. Effects of height on leaf function traits were Magnolia blumei>Parashorea chinensis>Tsoongiodendron odorum>Castanopsis hystrix. As the change of height, nine kinds of leaf tissue functional traits, leaf thickness and leaf tissue density were the most stable performance, leaf area and leaf dry weight change were bigger. Specific leaf area showed a downward trend, specific leaf weight showed an upward trend.(3)With the growth of the tree age, the leaf functional traits of Magnolia blumei changed the most, and the leaf functional traits of Castanopsis hystrix were the most stable. Effects of tree age on leaf functional traits were Magnolia blumei>Parashorea chinensis/Tsoongiodendron odorum>Castanopsis hystrix. Among the nine leaf functional traits, leaf thickness and leaf tissue density were the most affected by tree age, and leaf fresh weight, leaf dry weight and leaf area were the least affected. The leaf functional traits of the four tree species varied significantly with tree age, but did not showed obvious regularity.(4)There was no significant correlation between leaf dry matter content and leaf thickness, and there was no significant correlation between leaf water content and leaf thickness, leaf area, leaf dry weight and specific leaf weight, while there was a certain correlation between other functional traits. The above results indicate that plant functional traits have certain correlations among them, and coordinate with each other to adapt to changes in the environment. The results of this study have a certain guiding significance for the plantation of local precious hardwood species.