Spatial Distributions and Release Risks of Calcium and Magnesium in Sediments from Jianhu Lake, Northwest Yunnan Province

Linlin Zhao; Qingguo Yu; Bo Li; Feng Wei; Junxia Wang

doi:10.11929/j.swfu.201912020

Journal of Southwest Forestry University > 2021 > 41(2): 118-124. > DOI: 10.11929/j.swfu.201912020

Linlin Zhao, Qingguo Yu, Bo Li, Feng Wei, Junxia Wang. Spatial Distributions and Release Risks of Calcium and Magnesium in Sediments from Jianhu Lake, Northwest Yunnan Province[J]. Journal of Southwest Forestry University, 2021, 41(2): 118-124. DOI: 10.11929/j.swfu.201912020

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Spatial Distributions and Release Risks of Calcium and Magnesium in Sediments from Jianhu Lake, Northwest Yunnan Province

1.
College of Wetlands, National Plateau Wetlands Research Center, Southwest Forestry University, Kunming Yunnan 650233, China
2.
College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China
3.
Institute of Environmental and Ecological Engineering, Guangdong University of Technology, Guangzhou Guangdong 510006, China
4.
College of Ecology and Environment, Southwest Forestry University, Kunming Yunnan 650233, China

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Received Date: December 08, 2019
Revised Date: March 01, 2020
Available Online: April 12, 2020
Published Date: February 28, 2021

Graphical Abstract

Abstract

Abstract

In order to study the spatial distributions and release risks of calcium (Ca) and magnesium (Mg) in Jianhu sediments from northwest Yunnan Province, the sediment samples of Jianhu Lake were pretreated by the methods of microwave assisted digestion. The contents of Ca and Mg were determined by inductively coupled plasma-optical emission spectrometry (ICP−OES). Meanwhile, the methods of Kriging interpolation and phosphorus release contribution calculation were used to study the spatial distributions and release characteristics of Ca and Mg in Jianhu Lake. The results showed that the average contents of Ca and Mg in the surface sediments were 18.91 g/kg and 8.20 g/kg in Jianhu Lake, respectively, and the average contents of Ca and Mg in the wetland restoration areas were all low, and the horizontal spatial variation coefficients were all greater than 10%. The contents of Ca and Mg in the columnar sediments of Jianhu Lake were 2.03–42.55 g/kg and 1.30–73.60 g/kg, respectively, and the contents of Ca and Mg in the surface sediments (0–5 cm) were all higher than those in the bottom sediments (70–75 cm). At the same time, the average values of fast release contribution rates of Ca and Mg were 15.84%, 3.71%, and the mean values of slow release contribution rates of Ca and Mg were 20.93%, 4.20%, respectively. Therefore, Ca and Mg in the sediments from Jianhu Lake were all generally in the states of releasing in a short time (25 years) and a long time (150 years).
- sediment,
- calcium,
- magnesium,
- spatial distribution,
- release risk,
- Jianhu Lake

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References (41)

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