Adaptive Response of Root Characteristics of Dalbergia odorifera to Limestone Gravel

Taking 1-year-old Dalbergia odorifera seedlings as experimental materials, using whole root and 2 compartment split root system, setting 2 kinds of substrates of dark brown lime soil and gravel, the adaptation strategy and coordination relationship of root traits of D. odorifera to the whole and local lime rock gravel matrix were analyzed. The results showed that compared with the plants grown in the black brown lime soil matrix of the whole root system, the plant seedling height, ground diameter growth, biomass, total root length, root tip number, average root diameter and root tip basic meristem thickness of the plants grown in the gravel matrix and 2 compartment split root system decreased, among which the plants grown in the gravel matrix decreased significantly, but the branch density increased continuously. That is, in the whole plant and local root tissue strategy, D. odorifera mainly adapts to the stress of limestone gravel by optimizing the resource allocation between various organ systems, increasing the branch density and reducing the average root diameter, so as to increase the contact area with the matrix.