[Distribution of sediment iron of the ditch system in Sanjiang Plain, northeast China].
The iron distribution of the multi-level ditch system (hair canal-field canal-lateral canal-branch canal-main canal) was studied through total iron determination of the sediments (0-60 cm). The results showed that the mean concentration was (3.02 +/- 0.10) x 10(4) mg x kg(-1). Extremely significant difference was obseved between different ditch level (F = 6.261, p << 0.001), and the highest and the lowest concentration were present in the farmland lateral canal (3.71 x 10(4) mg x kg(-1)) and wetland canal (2.43 x 10(4) mg x kg(-1)), respectively. The difference of different sediment layers was not significant (F = 0.093, p = 0.693), while the iron concentrations of 0-10 cm and 10-20 cm sediments were 51.96% and 62.22% higher than that of the natural wetland soil nearby, respectively. Iron can transfer with the runoff in a certain extent, but it was not cumulated along the ditch system with the largest cumulation location at the third level. The runoff containing iron decreased gradully because of the wetland protection and climate change nowadays. The horizontal transfer of iron along the ditch system indicated the timing and intensity of iron loss in the past since the canals were dredged.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130012, China. zouyc@neigae.ac.cn
Yuan-Chun
YC
Zou
Xian-Guo
XG
Lü
Ming
M
Jiang
Min
M
Xi
D002681:China; D018556:Crops, Agricultural / Q000254:growth & development; D004784:Environmental Monitoring; D019015:Geologic Sediments / Q000737:chemistry*; D007501:Iron / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D014872:Water Movements; D014876:Water Pollution / Q000517:prevention & control*; D053833:Wetlands
D007501:Iron