| Characteristics of spatial and temporal variability of soil nutrients in cropland of Baishui County |
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| DOI：10.7606/j.issn.1000-7601.2023.03.30 |
| Key Words: cropland soil nutrients center of gravity model spatio\|temporal variation |
| Author Name | Affiliation | | XIA Liheng | Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an, Shaanxi 710075, China
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an, Shaanxi 710075, China | | SHEN Jianglong | Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an, Shaanxi 710075, China
Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an, Shaanxi 710075, China | | SUN Yutong | Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an, Shaanxi 710075, China
Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an, Shaanxi 710075, China | | LIU Jing | College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| Study of spatial variability of soil nutrients is very important for improving the yield per unit area of food crops and protecting the agroecological environment and is a prerequisite for the implementation of precision agriculture. To understand the spatial and temporal variability of soil nutrients in the northern Weibei Plateau region of Shaanxi, the spatial autocorrelation and center of gravity models were integrated to analyze the spatial and temporal variability characteristics of soil organic matter (SOM), available phosphorus (AP) and available potassium (AK) in cultivated land in Baishui County from 1980 to 2007 and 2007 to 2017. The results showed that the average contents of soil SOM in the study area increased by 1.29 g·kg-1 and 3.22 g·kg-1, respectively, and the average contents of AP increased by 6.89 mg·kg-1 and 24.45 mg·kg-1, respectively, while only the average contents of AK had a trend of the first decrease and then increase. The coefficients of variation of soil nutrients in arable land in all three periods ranged from 30.2% to 90.8%, which was moderate variation. The global Moran’s I indices of soil SOM, AP, and AK in arable land decreased from 1980 to 2017, with a weakening spatial structure and an increase in the role of stochastic factors. Soil SOM, AP, and AK content all increased to different degrees, and soil SOM content generally showed a low north\|south high distribution, while the distribution of soil AP and AK content was more consistent, having a high east\|west low distribution. The center of gravity of SOM generally shifted in the southeast direction, and the center of gravity of AP and AK generally shifted in the northeast direction. The spatial distribution pattern of the soil nutrient standard deviation ellipse was consistent with the distribution direction of the study area, and the turning angle showed an increasing\|decreasing change pattern, with the ellipse area decreasing and the spatial distribution of nutrients tending to be concentrated. In summary, this study has identified the spatial distribution of soil nutrients and the direction of nutrient gravity shift, providing a basis for rational planning and use of land resources and soil nutrient management. |
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