Response of Fine Root to Nitrogen Deposition and Elevated Atmospheric CO2 Concentration in Boreal Forest

doi:10.11924/j.issn.1000-6850.casb16110155

Abstract

Abstract: Boreal forest is the second largest biome in the world, accounting for about 30 percent of the global forest area. Although fine root biomass accounts for only a small fraction of the total in the boreal forests, their turnover rates are faster and more easily decomposed, so they contribute more to soil carbon cycle and atmospheric carbon flux. In this paper, we summarized the changes of nitrogen (N) deposition and CO2 concentration, and summarized and compared the results of the fine root correlation research, and discussed the response of the morphology, anatomical structure and physiological function of the fine root to N deposition and CO2 concentration changes. The results are as follows: (1) China''s atmospheric N deposition has been on the rise, and the proportion of organic N is closely related to human activities gradually increased, while the inorganic nitrogen in the NH4-N and NO3-N trends are different; (2) The atmospheric CO2 concentration has been on the rise and may decline in the future, and the fine root morphological characteristics, anatomical structure and physiological function showed the obvious response to the two factors. (3) Tree species, age, soil types will affect the response of the fine root morphology, anatomical structure and physiological functions to nitrogen deposition and elevated CO2 concentration, and there are different changes in performance. This article can provide the reference basis and data support for the response of boreal forest and temperate forest ecosystem function to elevated nitrogen deposition and CO2 concentration.

CLC Number:

X171.1

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