三江平原水稻田耕层土壤铁随开垦年限的动态变化.pdf

31 3 Vol. 31, No . 3 2011 6 Bulletin of Soil and Water Conservation Jun. , 2011 1, 2 1 1 霍莉莉 , 吕宪国, 邹元春 ( 1. , , 130012; 2. , 100049) : , , , ; , 3 11 a , 5 14 a ; , a 1 562. 41 mg/ kg, ; , a 0.46; a , 5~ a , a 0. 1 , ; , , , : ; ; ; ; : A : 1000-2 X(2011) 03-0022-04 : X53 Changes of Iron in Topsoil of Paddies as Affected by Reclamation Ages in Sanjiang Plain 1, 2 1 1 HU O L-i li , L Xian-guo , ZOU Yuan-chun ( 1.K ey L aboratory of Wetland Ecology and Environment, Northeast Institute of Geograp hy and Agricultural Ecology, hinese Academy of Sciences, hangchun 130012, hina; 2. Graduate University of hinese Academy of Sciences, Beij ing 100049, hina) Abstract: T emporal changes of the total iron, free iron, chelated iron, amorphous iron, free degree, complex ( chelating) degree and activation degree of soil iron oxides in the topsoil of the paddies after reclamation in the Sanjiang Plain w ere studied. T he results show ed that total iron in the topsoil of the paddies increased ex- ponentially w ith time since reclamation. Free iron show ed a fluctuating upw ard trend w ith the w ave troughs appeared in the 3rd year and the 11th year, and the w ave peaks in the 5th year and the 14th year. Chelated iron increased during the first eight years after reclamation, reached 1 562. 41 mg/ kg at the th year, and then decreased. Amorphous iron d