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| Spatial distribution characteristics of farmland soil organic carbon and its effect on salinization in the eastern foot of Helan Mountain |
| Received:May 24, 2022 |
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| KeyWord:saline soil|carbon cycle|soil organic carbon|salinization characteristics|spatial distribution |
| Author Name | Affiliation | E-mail | | LI Xiujing | School of Geography and Planning, Ningxia University, Yinchuan 750021, China | | | XIAO Guoju | School of Geography and Planning, Ningxia University, Yinchuan 750021, China
School of Ecology and Environment, Ningxia University, Yinchuan 750021, China | xiaoguoju1972@163.com | | GUO Zhanqiang | School of Geography and Planning, Ningxia University, Yinchuan 750021, China | | | WANG Jing | School of Ecology and Environment, Ningxia University, Yinchuan 750021, China | |
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| Abstract: |
| This study was conducted to reveal the spatial and quantitative changes in soil organic carbon（SOC）using soil salinity and pH. We selected the maize farmland ecosystem at the eastern foot of Helan Mountain in Ningxia as the experimental area and used the stationing method to determine the location of sample points from 2019 to 2020. Using the Ordinary Kriging and classical statistical methods, we analyzed the spatial distribution characteristics of SOC and soil salination in the eastern foot of Helan Mountain. The results showed that the spatial distribution of SOC was higher in the east and lower in the surrounding areas; whereas the spatial distribution patterns of total salt, Ca2+ , Mg2+ , Na+ , SO+2- and Cl- were similar, that is, they were symmetrically distributed along the center of the experimental area, and the high value area was roughly distributed on both sides of the north-south diagonal. The soil pH was distributed in strips, with a distribution characterized by a high center and low surrounding areas. The soil pH values in the experimental area ranged from 8.47 to 9.44, and was generally alkaline. CO32- and HCO-3 were the dominant factors affecting soil alkalization in this region. With an increase in SOC content, the total salt content, soil pH, Ca2+, Mg2+, K+, Na+, SO+2-, CO32-, and Cl- showed a fluctuating trend. When the SOC content was between 1.00-6.00 g·kg-1, there was a significant positive correlation between the organic carbon and pH. When the SOC content was more than 6.00 g·kg-1, it was beneficial to improve soil salinization. |
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