Nonstructural carbohydrates, carbon and nitrogen concentrations in fine roots of Quercus variabilis secondary forests after two different periods of regeneration

Aim of study: Quercus variabilis is a sclerophyllous oak with strong resprouting capabilities and whose regeneration facilitated by the development stump shoots following disturbance. During secondary forest regeneration, fine roots are important organs relative to changes in stand characteristics. Here, we aimed provide novel insights into chemical composition variations seasonality root order hierarchy Q. at different periods regeneration.Area The located next Baxianshan National Reserve southern part Yanshan Mountains, Tianjin, China.Materials methods: Six plots were established stands either eight or 40 years for repeated sampling during growing season 2019. All classified branch order. first three orders collected analyse concentrations nonstructural carbohydrate, carbon, nitrogen.Main results: Short-term showed reduction soil moisture an increase temperature because lower canopy cover, compared long-term stands. Soluble sugar starch short-term than those stands, decreasing ratio both parameters was observed Less carbon greater nitrogen found which resulted weaker C/N values. Nonstructural carbohydrate stored more higher terminal presented sensitivity regeneration. Redundancy discriminate analysis demonstrated that affected positively cover negatively temperature.Research highlights: seasonal dynamics allocation reserves varied discrepancy between traits. onset may elevate risk death.Keywords: soluble sugar; starch; regeneration; order; ratio; redundancy analysis.