Abstract:
Nowadays, under the background of climate change, people pay more and more attention to the protection and research of forest ecosystem. In this thesis, three broad-leaved tree species,Betula platyphylla, Tilia amurensis, and Acer mono, were selected in northeast China to study the regeneration patterns of seedlings and saplings and the variation of leaf functional traits. In the first study (Chapter 2), I explored the distribution characteristics of slope, aspect, topographic position, canopy openness and latitude on seedlings and saplings regeneration, I found that there were few seedlings and saplings of B. platyphylla, followed by T. amurensis in the middle of the succession, while there are many A. mono in the late succession, and they often occur on gentle slopes, middle and upper slopes, and sunny slopes. Canopy openness was strongly negatively correlated with the number of seedlings and saplings of T. amurensis and A. mono. In the second study (Chapter 3), I measured three economic traits, two anatomical traits and two hydraulic traits.I have found the leaf traits significantly varied across the different survey sites, there were correlations among leaf traits. Therefore, based on seedlings and saplings regeneration patterns and the intraspecific variation and coordination of different species along latitudinal gradients will help to further reveal the adaptation strategies and future development directions of plants to climate change.
