title: [Variation in soil Mn fractions as affected by long-term manure amendment using atomic absorption spectrophotometer in a typical grassland of inner Mongolia].
abstract: The effect of sheep manure amendment on soil manganese fractions was conducted in a 11 year experiment at inner Mongolia grassland, using sequential extraction procedure in modified Community Bureau of Reference, and determined by atomic absorption spectrophotometer. Five treatments with dry sheep manure addition rate 0, 50, 250, 750, and 1500 g x m(-2) x yr(-1), respectively, were carried out in this experiment. Results showed that the recovery rate for total Mn was 91.4%-105.9%, as the percentage recovered from the summation of the improved BCR results with aqua regia extractable contents, and it was 97.2%-102.9% from certified soil reference materials. Plant available exchangeable Mn could be enhanced by 47.89%, but reducible and total Mn contents decreased significantly under heavy application of manure at depth of 0-5 cm. The effect of manure amendment on Mn fractions was greater in 0-5 cm than in 5-10 cm soil layer. The results are benefit to micronutrient fractions determination and nutrient management in grassland soils.
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China. fumingming1234@126.com
authors.forename: Ming-ming
authors.initials: MM
authors.lastname: Fu
authors.forename: Yong
authors.initials: Y
authors.lastname: Jiang
authors.forename: Yong-fei
authors.initials: YF
authors.lastname: Bai
authors.forename: Yu-ge
authors.initials: YG
authors.lastname: Zhang
authors.forename: Zhu-wen
authors.initials: ZW
authors.lastname: Xu
authors.forename: Bo
authors.initials: B
authors.lastname: Li
mesh_terms: D000818:Animals; D002681:China; D065948:Grassland; D008345:Manganese / Q000032:analysis*; D008372:Manure; D010944:Plants; D012756:Sheep; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants; D013054:Spectrophotometry, Atomic; D014131:Trace Elements
chemical_list: D008372:Manure; D012987:Soil; D012989:Soil Pollutants; D014131:Trace Elements; D008345:Manganese