Study On The Functional Traits Of Typical Tree Species In The Northeast Of China

Plant functional traits (plant functional traits) is a hot spot of research on ecology in recent years. The branches, leaf functional traits and plant to obtain, and utilize resources use efficiency and the relationship between the most closely. So the different species of tree branches, leaf functional traits has important ecological significance. Mao Er mountain in this study to our country northeast experimental forest farm of common tree species, different tree leaf functional traits was analyzed through statistical analysis of the statistical characteristics of leaf functional traits was analyzed through Pearson correlation analysis, the relationship between the internal and branchlets function properties and the relationship between the leaf functional traits, and clustering analysis was carried out on the tree branches function traits. This article selects specific leaf area, leaf thickness, leaf water loss rate, the strength of the leaf, petiole length, petiole diameter, branch length, the diameter of branchlets, specific leaf area, specific leaf weight, content of nutrient elements, stomata length, width of stomatal and stomatal density functional branches properties were studied. Main conclusions are as follows:1, leaf area range of 6.68～166.83 cm2 (white) (green our maple), branchlets on leaf number range is 2 (green our maple) to 94.17 (walnut Chinese catalpa), suggesting that green our largest maple leaf area, leaf number on branchlets, namely with the increase of the intensity of the leaf, tree leaf area and leaf weight also decreased.2, petiole diameter showed very significant positive correlation with the single leaf area, total leaf weight, total leaf area and the diameter of branches is extremely significant positive correlation, namely whether at leaf level or in a small branch level, large leaf will pay a larger proportion than small blade petiole biomass; water loss rate and nutrients (N,P,K) is very significant positive correlation, namely at the leaf level, high nutrient content of blade is faster than low content of leaf water loss rate.3, Mao Er mountain experimental forest farm of northeast forestry university in the northeast of 16 typical common tree with branches function traits for classification basis, based on the system clustering analysis traits can be divided into three functional groups. Respectively:A class for the branch length, branch diameter, total leaf area, total leaf weight, leaf strength, nutrient content, from the branch level, there are important trade-offs between leaf area and leaf number of long, namely, relation between born that year branchlets shorter than born that year branchlets with less quantity, unit length of the stem leaf number also less; Class B for the water loss rate, leaf area, total leaf area, we draw a small leaf tree species of water loss rate is higher than the large leaf tree species, if a plant leaf water retention is plant drought resistance index, so our conclusions will be small leaf tree species of drought resistance performance than large leaf tree species; Class C for stomatal length and width of stomatal and stomatal density, present a positive correlation between stomata length and width of different tree species, and stomata length, width, and negative correlation between stomatal density, this shows that in unit leaf area, stomatal size and the coordination between stomatal density, the porosity, the greater the stomatal density is smaller; On the contrary, the smaller the porosity, the bigger the stomatal density.