Effects of atmospheric warming on physiological characteristics of leaves and fine roots of Cunninghamia lanceolata saplings

In order to reveal the response of physiological characteristics of subtropical forests to global warming in the future, the Cunninghamia lanceolata(C. lanceolata) was taken as the research object, the open-top heating method was used to simulate climate warming to study the contents of malondialdehyde(MDA), active oxygen metabolism, and penetration in leaves and fine roots. The results showed that(1) warming significantly increased the contents of MDA in the leaves and fine roots. Also the content of MDA in leaves was higher than that of fine roots, These indicated that oxidative stress enhanced the oxidative damage of leaves and fine roots, and the degree of oxidative damage of leaves was higher than fine roots;(2) warming increased the contents of proline and soluble protein in fine roots, but decreased the contents of proline and soluble protein in leaves;(3) warming increased the peroxidase activity of the leaves significantly, but had no significant effect on the antioxidant enzyme activity of the fine roots;(4) the active oxygen contents of leaves and fine roots had no significant change after warming, but the active oxygen content of leaves was obviously higher than that of fine roots. Comprehensive analysis showed that although warming increased the oxidative damage of leaves and fine roots, C. lanceolata saplings could maintain their own active oxygen metabolism balance by increasing the antioxidant enzymes activity in leaves and accumulating more osmotic adjustment substances in fine roots. It can be seen that the cooperation and coordination between the aboveground and belowground organs were helpful for C. lanceolata saplings to adapt to the high temperature environment effectively.