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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (25): 94-101.doi: 10.11924/j.issn.1000-6850.casb2022-0730

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Spatial Distribution Characteristics and Fertility Evaluation of Soil Nutrients Based on GIS

LI Jiaxin1(), GAI Weiling2(), SUN Xianmin1, ZHAO Xin1, ZHANG Xiaoguang1, CUI Dejie1   

  1. 1 College of Resources and Environment, Qingdao Agricultural University, Qingdao, Shandong 266109
    2 College of Agronomy, Qingdao Agricultural University, Qingdao, Shandong 266109
  • Received:2022-08-23 Revised:2022-12-05 Online:2023-09-05 Published:2023-08-28

Abstract:

To understand the soil nutrient status of 18 villages in the north of Ligezhuang Town of Jiaozhou City, so as to provide reference for scientific setting of fertilization methods and soil improvement in the construction of high-standard farmland. Soil nutrient content was detected in the study area. A total of 43 sampling points were set up to determine soil pH, organic matter, total nitrogen, alkali-hydrolyzed nitrogen, available phosphorus and available potassium. The general Kriging interpolation method of ArcGIS was applied to analyze the spatial distribution characteristics of soil nutrients in the study area. The index weights were determined by principal component analysis, and the soil fertility grades were divided by index sum method and the results were visualized. The results showed that: (1) the soil in the study area was mainly acidic and neutral. The content of organic matter, total nitrogen and alkali-hydrolyzed nitrogen was insufficient, and the content of available phosphorus was rich with medium available potassium. (2) Generally, pH values were low in the north and south, high in the middle, while low in the east but high in the west. The contents of organic matter, total nitrogen and alkali-hydrolyzed nitrogen were higher in the east but lower in the west, indicating that they were significantly correlated. The distribution of available phosphorus was low in the east while high in the west, and that of available potassium was high in the east but low in the west. (3) The land areas of class Ⅰ-Ⅴ were 365.11, 545.80, 803.71, 547.93 and 390.85 hm2, respectively, accounting for 13.76%, 20.57%, 30.29%, 20.65% and 14.73% of the total studied area. The overall soil fertility of the 18 villages in the north of Ligezhuang Town in Jiaozhou City was at a medium level, and it was abundant in the east but poor in the west. To control soil acidification and increase contents of organic matter, total nitrogen and alkali-hydrolyzed nitrogen were of great significance for the next step of building high standard farmland.

Key words: soil nutrients, distribution characteristics, index content, soil fertility level, Kriging interpolation, principal component analysis