Functional Traits Of The Leaves And Roots Of Dicranopteris Dichotoma And Their Relationship With Soil Factors Under Different Ages Of Erosion Restoration In Southeast China

At present,there are few reports on the study of functional traits of the functional properties of the Dioropteris dechotoma,an ecologically managed vegetation in the eroded areas of South red soil in China.In this study,the functional traits of the leaves and root systems of the Dioropteris dechotoma were studied under different governance years in the region?including 0 years of governance,6 years of governance,12 years of governance,18 years of governance,36 years of governance,and 80 years of governance?.Based on the changes of soil factors in different years of management,time and space substitution method was used to study the changing regularity and relationship between the leaf and root functional traits of the Dioropteris dechotoma,and the response of leaf and root functional traits to soil factors.The results show that:?1?With the increase of treatment years,the functional traits and morphological characteristics of leaves and roots of the Dioropteris dechotoma showed significant differences?P<0.05?.With the increase of treatment years,the combination of different functional traits showed stress,expansion and competition.The fractal features of the blade contours under different years of treatment have a good fitting state.The maximum fractal dimension?1.696?appears in the untreated land,and the leaf area and leaf quality also have an allometric growth,and the number of years of treatment increases.Weakened,until the 80-year-old allometric growth index b(_LW-LA)reached 0.909 and was close to constant growth.The root system showed obvious topological characteristics,and the maximum topological index?0.92?appeared in the 18 years of governance;the main lateral root ratio also appeared in the 18-year landlord for the minimum value of each index,indicating that the Dioropteris dechotoma had more growth advantages under the environmental conditions of the treatment stage.?2?Correlation analysis showed that the leaves functional traits and root functional traits were closely related?P<0.01?,and the correlation between leaf and root functional traits was significant?P<0.01?,indicating that there was a functional relationship between leaf and root functional traits.Principal Component Analysis?PCA?showed that leaf total nitrogen content,specific leaf area and total phosphorus content ranked higher in leaf principal component contribution,which could be used as the main index for evaluation of leaf functional traits;root total nitrogen content,root total potassium content and leaf total phosphorus The content ranks higher on the main component of the root system and can be used as the main index for evaluating the functional traits of the roots.The functional traits of the integrated leaves and roots were found to be the top three in the main component of leaf area,total nitrogen content and chlorophyll content,which can be regarded as the dominant functional traits affecting the growth process of the Dioropteris dechotoma.?3?With the increase of the years of governance,the soil nutrient factor is gradually increasing,and the soil physical factor changes are more random.Redundancy analysis showed that soil total carbon content,soil total nitrogen content and soil total phosphorus content were the main soil factors affecting the functional characters and root functional traits of the leaves.Therefore,it can be concluded that the functional characters of Dioropteris dechotoma in the eroded areas of South red soil are mainly influenced by soil total carbon content,soil total nitrogen content and soil total phosphorus content.With the increase in the number of years of governance,from the earliest invasion to the latest exit,the leaf and root function traits of the Dioropteris dechotoma show corresponding adaptation strategies due to the improvement of the soil environment,reflecting the strong plasticity of the Dioropteris dechotoma with the change of soil factors.As an important ecological control vegetation,it is beneficial to the effective planting and restoration of the erosion area of South red soil.