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Chinese Agricultural Science Bulletin ›› 2024, Vol. 40 ›› Issue (22): 81-87.doi: 10.11924/j.issn.1000-6850.casb2023-0606

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The Quantitative Analysis for the Relationship Between Earthworm Density and Major Parameters of Soil Physical Fertility

MA Qian1(), DIAO Feifei2, DU Xin2, CHEN Riyuan1, LIN Qimei2(), ZHAO Xiaorong2, LI Guitong2   

  1. 1 Engineering Research Center for Recycling Organic Waste/ Beijing Goldenway Bio-tech Co. Ltd., Beijing 100015
    2 College of Land Science and Technology, China Agricultural University, Beijing 100193
  • Received:2023-08-22 Revised:2024-01-17 Online:2024-07-28 Published:2024-07-28

Abstract:

This study was aimed to analyze the relationship between earthworm density and the main parameters of soil physical fertility, and quantitatively evaluate the impact of earthworms on soil physical properties through field samples and data collection from literatures. Relevant data was extracted by inputting keywords such as earthworm, soil bulk density, soil water content, soil texture, soil porosity, and soil water-stable aggregates in the China Knowledge Infrastructure and Web of Science. The data extracted from the literature was combined with the data we obtained to perform Pearson correlation analysis. It was found that earthworm density was significantly, negatively and exponentially related with sand percentage (P<0.001), and significantly, positively and exponentially related with silt percentage (P<0.05) while significantly related with clay percentage in power function (P<0.001). There was a weak negative correlation with soil bulk density (P<0.20), and a significant positive correlation with soil porosity (P<0.05). There was a weak positive correlation with water stable aggregate content (P<0.5), but a very significant positive correlation with water content (P<0.001). The quantitative relationship between earthworm density and the main parameters of soil physical fertility can be divided into five classes according to the relationships between earthworm density and the relative content of sand, silt and clay, soil bulk density, porosity, water stability aggregate and water content, which may be valuable for estimating the impacts of earthworm on soil physical fertility.

Key words: earthworm density, clay, silt, sand, bulk density, porosity, water-stable aggregates, soil moisture