title: [Effects of land use on manganese distribution and fractions in wetland soil of Sanjiang Plain, Northeast China].
abstract: A detailed investigation was conducted to study the variations of manganese contents and fractions in soil under different land use patterns in Sanjiang Plain, Northeast China. The purpose of this work was to study the changes of manganese and its fractions during wetland cultivation and their relationships with environment factors. The results indicated that the total manganese contents (Mn(tot)) were relatively low in wetland soils. When wetland was cultivated into dry farmland (corn field), M(tot) showed an increasing trend, and when wetland was cultivated into rice paddy, Mn(tot) manifested a decreasing trend. Among the four fractions of manganese in soil, the residual part (Mn(res)) and the reducible part (Mn(red)) were predominant while the acid extractable part (Mn(ext)) and the oxidizable part (Mn(oxi)) were secondary. During the cultivation of wetlands to corn field or rice paddy, Mn(oxi) was the only part with significant change. Mn(tot) and the transformations among manganese fractions were affected by many environmental factors, with sulfur content, pH and dissolved organic carbon playing leading roles.
authors.affiliation: Key Laboratory of Wetland Ecology and Environment, Institute of Northeast Geography and Agroecology, Chinese Academy of Sciences, Changchun, 130102, China. zzslycn@163.com
authors.forename: Zhong-Sheng
authors.initials: ZS
authors.lastname: Zhang
authors.forename: Xian-Guo
authors.initials: XG
authors.lastname: Lü
authors.forename: Xiao-Lin
authors.initials: XL
authors.lastname: Song
mesh_terms: D002244:Carbon / Q000032:analysis; D002681:China; D018556:Crops, Agricultural / Q000254:growth & development; D006863:Hydrogen-Ion Concentration; D008345:Manganese / Q000032:analysis / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D014197:Trees / Q000254:growth & development; D053833:Wetlands
chemical_list: D009930:Organic Chemicals; D012987:Soil; D008345:Manganese; D002244:Carbon