Differences in Cladonia rangiferina nitrogen uptake capacity between ammonium and nitrate with uptake kinetics

doi:10.13287/j.1001-9332.202407.016

Abstract

Abstract: Atmospheric nitrogen (N) deposition could affect the structure and function of terrestrial plants. Non-N₂-fixing lichens are used to monitor atmospheric N deposition because they rely on the deposited inorganic N (i.e., ammonium and nitrate) as N sources. However, the uptake capacities of lichen on ammonium and nitrate remain unclear, which hinders the application of lichen N content to accurate bioindication of atmospheric N deposition levels. We investigated ammonium and nitrate uptake capacities of Cladonia rangiferina, which was treated with ammonium alone, nitrate alone, and ammonium and nitrate mixture solutions with different mixing ratios under light and dark conditions. The results showed that N uptake rates increased with ammonium and nitrate concentrations in solutions and generally followed the Michaelis-Menten saturation kinetics. Ammonium uptake of C. rangiferina showed higher values of affinity, and was more efficient than the nitrate uptake. Both rates and amounts of nitrate uptake decreased with increasing ratios of ammonium to nitrate in solutions, while ammonium uptake showed no substantial variations, indicating an inhibition of ammonium on nitrate uptake capability. The darkness significantly decreased the maximum uptake rate and efficiency of nitrate, but had much weaker effects on lichen ammonium uptake. These findings highlight the preference of lichen on ammonium as a key N uptake strategy. It is thus necessary to consider the main types of atmospheric inorganic N deposition when using lichens to monitor atmospheric N pollution levels and evaluate N deposition based on lichen ecophysiology.

Key words: lichen, ammonium, nitrate, nitrogen uptake, atmospheric N deposition

CHEN Runyu, HU Wenhui, LIU Xueyan. Differences in Cladonia rangiferina nitrogen uptake capacity between ammonium and nitrate with uptake kinetics[J]. Chinese Journal of Applied Ecology, 2024, 35(7): 1859-1865.

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