Abstract:

In order to discuss the response law of root in Neyraudia reynaudiana to drought stress, and provide scientific theoretical basis for the promotion and application of Neyraudia reynaudiana in soil erosion area, taking pioneer species Neyraudia reynaudiana which was widespread in southern China region of water and soil conservation as the research object, pot experiment with 4 different drought stress was designed, root morphology index and biomass distribution were determined in different treatments, and morphological response to drought stress was researched. The results showed that among treatments with different drought stress, there was significantly different in total root length, root surface-area, root average diameter, root biomass of Neyraudia reynaudiana, but not in the root volume. The root volume and root average diameter decreased with increasing drought stress, and there were lower under drought stress than enough water supplies. The total root length, root surface-area, root biomass, root-shoot ratio were greater under drought stress than enough water supply, and there were the largest under moderate drought stress with field moisture capacity by 40%±5% among different treatments. Neyraudia reynaudiana had strong drought-resistant and drought-tolerant, because it had a large root system with root length and root surface-area. Information on the response of root characters of elongation growth and enlargement root-soil interface of Neyraudia reynaudiana would provide one of useful information for explaining mechanisms of morphology response under drought stress.