Distribution Characteristics and Influencing Factors of Glomalin in Soil Aggregates: A Meta-Analysis

Shenyang Agricultural University

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Supported by the National Natural Science Foundation of China (Nos. 41977088 and 41807089)

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    【Objective】This study aimed to understand the role of glomalin in maintaining soil organic carbon (SOC) balance and soil aggregate stability, and construct management strategies for improving soil structure and soil quality. 【Method】 To fully understand glomalin, we collected published data in recent years (332 sets of data from 19 literature), quantitatively analyzed the distribution characteristics of glomalin in soil aggregates, and systematically analyzed its influencing factors. Moreover, the distribution of glomalin in soil aggregates under different land uses was compared. 【Result】The results showed that the weight percentages of the > 2 000 μm and 2 000-250 μm aggregates (about 40%, respectively) were significantly higher than that of the 250-53 μm aggregates ( about 20%). The proportion of easily extractable glomalin in total glomalin was 20% in <53 μm aggregates, which was lower than other particle sizes (> 30%). There was no significant difference in the glomalin-C in SOC in different aggregates. The proportion of easily extractable glomalin-C in aggregates of different particle sizes was about 2%, while the proportion of total glomalin-C was about 8%.【Conclusion】In the >250 μm aggregates, GRSP (glomalin related soil protein) increased with the increase of temperature and precipitation, but decreased with the increase of pH. Although these correlations were not found in <250 μm aggregates, there was a significant positive correlation between glomalin and SOC. By comparing different land use patterns, we found that the glomalin in the aggregates of forest soil was more than those in farmland and grassland, which indicated that forest soil was more conducive to the accumulation of glomalin than farmland and grassland.

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  • Received:January 17,2023
  • Revised:October 11,2023
  • Adopted:November 27,2023
  • Online: December 01,2023
  • Published: