Dynamics of nutrient element iron in soil-plant ecosystem of the Songnen Plain Leymus chinensis grassland

Abstract

Abstract: The study showed that in the soil-plant ecosystem of the Songnen Plain Leymus chinensis grassland,the contents of total and available iron in soil were relatively low,while Leymus chinensis was abundant in iron.The concentrations of soil total and available iron decreased with soil depth.Soil available iron positively correlated with soil organic matter,while negatively correlated with soil pH.The dynamics of soil total iron showed a “V" curve during the growth season,with the lowest in July,and that of soil available iron was similar to soil total iron from May to August,and gradually decreased after August.The iron concentration in Leymus chinensis changed dramatically with the trend of root>rhizome>leaf> litter >stem.The iron concentrations in leaf and stem had a fluctuant decrease,while those in root,rhizome and litter were fluctuated in “V" curve.Soil A layer enriched in a little more available iron.The iron activation with an average of 0.64% increased from May to August,and decreased after August,with the lowest in October.The shift ratio from underground to aboveground part of Leymus chinensis dropped during May-July,went up in August,and then dropped again.The average shift ratio from aboveground part to litter was 105.0%,which negatively correlated with that from underground to aboveground part.

Key words: Leymus chinensis grassland, Soil, Total iron, Available iron

CLC Number:

Q945.1

ZHOU Xiaomei, GUO Jixun, ZHAO Jiang . Dynamics of nutrient element iron in soil-plant ecosystem of the Songnen Plain Leymus chinensis grassland[J]. Chinese Journal of Applied Ecology, 2004, (12): 2250-2254.

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