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[1]ZHAN Naicai,WANG Yan,LIU Yungen,et al.Distribution Characteristics of Different Calcium Speciation in the Sediment of Typical Karst Wetland in Southeast Yunnan[J].Research of Soil and Water Conservation,2018,25(02):374-378,386.

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Distribution Characteristics of Different Calcium Speciation in the Sediment of Typical Karst Wetland in Southeast Yunnan

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 02 Page number: 374-378,386 Column: Public date: 2018-04-03

Title:: Distribution Characteristics of Different Calcium Speciation in the Sediment of Typical Karst Wetland in Southeast Yunnan

Author(s):: ZHAN Naicai¹, WANG Yan^1,2, LIU Yungen^1,2, HOU Lei^1,2, WANG Shujin¹, ZHANG Huijuan¹; 1. College of Ecology and Water & Soil Conservation, Southwest Forestry University, Kunming 650224, China;
2. Research Institute of Rural Sewage Treatment, Southwest Forestry University, Kunming 650224, China

Keywords:: karst wetland; calcium; sediment; distribution characteristic

CLC:: X53;P931.5

DOI:: -

Abstract:: This study explored the distribution of calcium (Ca) in paddy wetland-meadow wetland-lakeside wetland in the karst area, and provided the theoretical basis for the ecological cycling in the karst ecosystems and the ecological environment protection of the small watershed. Setting up the typical plots in the karst wetland of Puzhehei located in southeast of Yunnan Province, using the typical transect pattern of striping and using the BCR continuous extraction method, we explored the distribution characteristics of total calcium, the acid-soluble fraction, reducible fraction, oxidizable fraction, residual fraction in the paddy wetland, meadow wetland, lakeside wetland, and analyzed the correlation among the different calcium speciation. The results showed that:(1) the distribution characteristics of total calcium content of surface sediment was consistent with the form of calcium content in paddy wetland-meadow wetland-lakeside wetland; the average content decreased in the order:paddy wetland (14 423 mg/kg) > lakeside wetland (10 863 mg/kg) > meadow wetland (4 846 mg/kg); (2) the calcium among the different speciation was dominated by acid-soluble fraction, which accounted for above 50% of total Ca, followed by reducible fraction accounting for more than 30%, the oxidizable and residual fractions together accounted for 20%. In addition to the residual fraction of calcium, the remaining fraction of Ca in the lakeside wetland decreased with the depth of the sediment; (3) there was the significant positive correlation between the total Ca and the acid-soluble fraction, reducible fraction, oxidizable fraction of Ca (p < 0.01), respectively, but not with the residual fraction of Ca. The acid-soluble fraction of Ca had the great impact on the total Ca. The calcium contents of sediments in Puzhehei showed the significant difference due to the different types of wetlands.

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