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| Analysis of spatial variation of soil moisture-salinity-nutrient in Ebinur Lake wetlands, China |
| Received:May 14, 2018 |
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| KeyWord:Ebinur Lake wetlands;moisture-salinity-nutrients;semi-variogram;spatial change ability |
| Author Name | Affiliation | E-mail | | FANG Li-zhang | College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Key Laboratory of Xinjiang Uygur Autonomous Region, Xinjiang Laboratory of Lake Environment and Resources in Arid Area, Urumqi 830054, China | | | LI Yan-hong | College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Key Laboratory of Xinjiang Uygur Autonomous Region, Xinjiang Laboratory of Lake Environment and Resources in Arid Area, Urumqi 830054, China | lyh0704@126.com | | LI Fa-dong | College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Key Laboratory of Xinjiang Uygur Autonomous Region, Xinjiang Laboratory of Lake Environment and Resources in Arid Area, Urumqi 830054, China
Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100190, China | | | ZHU Hai-qiang | College of Geographic Science and Tourism, Xinjiang Normal University, Urumqi 830054, China
Key Laboratory of Xinjiang Uygur Autonomous Region, Xinjiang Laboratory of Lake Environment and Resources in Arid Area, Urumqi 830054, China | |
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| Abstract: |
| To study the spatial variation of soil moisture-salinity-nutrient in Ebinur Lake wetlands, the wetlands were divided into 4 regions,northeast, northwest, southwest, and southeast, in a circular research area of 160 km2. The temporal and spatial distribution characteristics of soil salinity-nutrient-moisture and pH values in the surface layer(0~20 cm) were studied in May and August in 2014 and 2015. The results were as follows. The soil salinity, nutrients, and pH in different regions were higher in August than those in May, whereas the soil moisture content was the opposite. The soil moisture, salt, and nutrient contents were moderately variable, and the soil pH value was weakly variable. The soil salinization conditions in different regions in May and August were between moderate salinization and saline level. The pH value was alkaline or strongly alkaline, and the soil nutrients were generally poor. The spatial variability of the soil in Ebinur Lake wetlands could be well-described by the spherical, exponential, or Gauss model, and the coefficient of variation ranged from 31% to 96%. The nugget coefficients of soil water content were less than 34% in different regions. In addition to the soil pH in the southwestern region in May, and the soil nutrients in the northeast region, the nugget coefficients of soil salinity, pH, and nutrient in different regions were all less than 25% in May and August. The Moran's I coefficients of soil salinity, pH, and nutrient fluctuated greatly, indicating that the spatial correlation was strong. The soil moisture contents in May and August were distributed in strips.The high-value areas appeared in the northwest and southwest, and the low-value areas mainly in the southeast and northeast.The soil-salinity high-value areas were mainly in the northwest and southeast; the low-value areas were in the southwest and northeast. The soil-pH high-value areas were mainly in the northwest and around the lake. The distributions of the soil organic matter and total nitrogen had certain similarities, and the high-value areas appeared in the northwest and southwest. The total phosphorus content in the soil was irregular and spot-like, and the high and low values were scattered. It was found that the soil moisture content was influenced by both the structural and random factors, and the soil salinity, pH, and nutrients were mainly affected by the structural factors in the Ebinur Lake wetlands. |
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