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• W2392957526 abstract "The importance of iron as a limiting micronutrient for primary productivity in the world ocean,especially in the HNLC(High Nitrate Low Chlorophyll) regions,has become increasing clear following large-scale in-situ iron enrichment experiments and also been proved by natural observation after the aerosol dust deposition on the ocean.In recent years,the shortage of dissolved iron was considered to be one of the main factors limiting the primary productivity in the Okhotsk Sea and the northern North Pacific,while the changes of land use patterns nearby affect the iron input of these waters.Marsh wetlands was one of the major possible sources of dissolved iron and played an important role in the dissolved iron output from terrestrial ecosystems to rivers,however,the mean annual decrement area of wetland in the Sanjiang Plain in Heilongjiang province of Northeast China were 86×103 hm2 in the past 50 years,this maybe had been resulted in a marked decrease of dissolved iron output.In order to approach the dissolved iron species and their dynamics in the natural wetland,and estimate the contribution of wetland dissolved iron output to the nearby rivers,2 typical natural fresh marsh wetlands without human activity disturbance were selected in the Sanjiang Experimental Station of Wetland Ecology, CAS.The concentration of ferrous iron(Fe2+) and ferric iron(Fe3+),as well as environmental factors such as redox potential(Eh),electrical conductivity(EC) and water temperature(T) in the logging water of the above 2 typical fresh marshes were determined based on the in-situ sampling method and analyses technique from May to October in 2006,and the relationship of Eh,EC and Fe2+,Fe3+were also studied.Affected by the iron content both in the marsh soil and plants covered,the total concentration of water-soluble ionic iron in the Calamagrostis angustifolia marsh waters ranged from 1.20 mg/L to 7.30 mg/L,which was higher than that in the Carex lasiocarpa(0.24 mg/L to 5.20 mg/L) except August after storms.Temperature and precipitation had significant influence upon the temporal distribution of water-soluble ionic iron in the 2 marshes.the total concentration of water-soluble ionic iron in the Calamagrostis angustifolia marsh waters was lower in May,and then increased over time till the peak value appeared in July,and then decreased.There was a slighter peak in August,and then decreased with time again.At last,in the October,the total concentration of water-soluble ionic iron in the Calamagrostis angustifolia marsh waters was 0.70 mg/L,which was lower than thoses in May.The temporal distribution of water-soluble ionic iron in the Carex lasiocarpa marsh waters was similar to the Calamagrostis angustifolia marsh except that the peak values appeared in both July and August.The concentration of Fe3+ and Fe2+ in the 2 marshes ranged from 0.02 mg/L to 4.50 mg/L and 0.10 mg/L to 3.70 mg/L respectively.As for the species of water-soluble ionic iron,Fe3+ dominated both of the above marshes except for a quart samples.The distribution of the Fe2+ was influenced by the Eh;however,Fe3+ was not correlated with Eh.pH was not a key factor for the distribution of Fe2+ and Fe3+ in the typical marsh wetlands.The positive correlation between EC and Fe2+ was highly likely indicated that many dissolved ionic substances were released during the reductive process of iron,however,the concentration of Fe3+ did not decreased with the amount of Fe2+,this interesting phenomenon maybe linked with the organic matters." @default.
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• W2392957526 date "2007-01-01" @default.
• W2392957526 modified "2023-09-25" @default.
• W2392957526 title "Distribution of Water-soluble Ionic Iron of Deyeuxia angustifolia Marsh and Carex lasiocarpa Marsh in the Sanjiang Plain" @default.
• W2392957526 hasPublicationYear "2007" @default.
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