Effects of nitrogen and soil microbe on growth and photosynthesis of Fraxinus mandschurica seedlings.

doi:10.13287/j.1001-9332.201905.018

Abstract

Abstract: We examined the effects of nitrogen, soil microbe and their interactions on biomass allocation, growth and photosynthesis of Fraxinus mandschurica, a typical tree species in Changbai Mountain, through outdoor control experiments. In June 2017, an experiment with two-factor randomized block design was carried out. There were four treatments: control (F), nitrogen addition (FN), sterilization (FS), sterilization and nitrogen addition (FSN), six repetitive blocks, three repetitions per block, including 18 repetitions of each treatment. In mid-August 2018, we measured photosynthetic parameters and then harvested seedlings to measure biomass and growth parameters in September. The results showed that compared with F, FN significantly increased total biomass by 14%, basal diameter by 9%, chlorophyll content, net photosynthetic rate (P_n), stomatal conduc-tance (g_s), transpiration rate (T_r) by 75%, 318%, 231%, 227% respectively. FS significantly increased total biomass by 13%, basal diameter by 9% and chlorophyll content, P_n, g_s and T_r increased by 34%, 213%, 120% and 115%, respectively. FSN increased total biomass by 23%, basal diameter by 14%, chlorophyll content, P_n, g_s and T_r increased by 81%, 672%, 312% and 273%, respectively. Nitrogen, soil microbe and their interactions had significant effects on biomass, growth and photosynthesis of F. mandschurica seedlings. Soil microbe would regulate the response of F. mandschurica seedlings to nitrogen.

Key words: nitrogen, biomass, photosynthesis., Fraxinus mandschurica, soil microbe, growth

WANG Guo-jie, LIN Fei, HU Jia-rui, YUAN Zuo-qiang, HAO Zhan-qing, WANG Xu-gao. Effects of nitrogen and soil microbe on growth and photosynthesis of Fraxinus mandschurica seedlings.[J]. Chinese Journal of Applied Ecology, 2019, 30(5): 1445-1462.

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