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ARCTIC SOILS

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Are Arctic soils rich or poor?

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ARCTIC SOILSOnline version

Are Arctic soils rich or poor?

by Anna Wielgopolan
1

biomass low permafrost soil Microbial carbon rates short 11% imbalance slower decompose nutrient lignin fluctuations accumulation

and biological processes that govern soil cycling operate at different depending on a number of environmental factors . In arctic systems , these processes are generally than in most other ecosystems due to soil temperature , growing season , strong seasonal and sometimes also the occurrence of . Furthermore , slow - growing plants with high contents of and phenolic secondary compounds often dominate tundra vegetation . Tundra nutrient cycling is thus limited by the nature of the plant residues , that slowly . Since the deglaciation of the region after the last Ice Age ca . 3 , 000 ? 8 , 000 years ago , organic matter decomposition has been slower than primary production , resulting in the of organic matter in tundra soils . In contrast to most tropical ecosystems , where majority of the organic matter is in the living , a considerable portion of the C in tundra ecosystems is in the non - living part of the system , i . e . in the litter and . Due to the between production and decomposition of organic matter , arctic tundra is a strong sink for at the global scale . It is estimated that tundra soils contain of the world's soil carbon .

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