Effects of defoliation disturbance of aboveground biomass on photochemical process of reforested Calligonum caput-medusae saplings in arid desert

Abstract

Abstract: The effect of artificial disturbance on aboveground biomass of two years old Calligonum caput-medusae saplings was studied using different disturbance intensity (CK, 30%, 50% and 70%) and assessiing photochemical processes in PSⅡ of reforested shrub saplings. Saplings in the 30% disturbed group had the highest photochemical efficiency of PSⅡ and photosynthetic capacity. Most of the surplus absorbed energy by PSⅡ of experimental saplings could be dissipated as heat when the fraction of absorbed light utilized in PSⅡ photochemistry was inhibited, thus the excess excitation energy maintained a stable status. The saplings under high intensity disturbance could maintain the normal function of PSⅡ by series regulation and photoprotection mechanisms. However, high intensity disturbance of aboveground biomass (more than 50%) reduced the photosynthetic capacity, electron transport rate and the efficiency and activity of PSⅡ thus inhibiting the growth of saplings.

CLC Number:

ZHU Cheng-gang, LI Wei-hong, MA Jian-xin, MA Xiao-dong. Effects of defoliation disturbance of aboveground biomass on photochemical process of reforested Calligonum caput-medusae saplings in arid desert[J]. Acta Prataculturae Sinica, 2013, 22(2): 281-289.

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