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Scale-Location Dependence Relationship between Soil Organic Matter and Environmental Factors by Anisotropy Analysis and Multiple Wavelet Coherence

Author

Listed:
  • Yuxuan Gou

    (College of Land Science and Technology, China Agricultural University, Beijing 100193, China)

  • Dong Liu

    (College of Land Science and Technology, China Agricultural University, Beijing 100193, China)

  • Xiangjun Liu

    (College of Land Science and Technology, China Agricultural University, Beijing 100193, China)

  • Zhiqing Zhuo

    (Institute of Digital Agriculture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China)

  • Chongyang Shen

    (College of Land Science and Technology, China Agricultural University, Beijing 100193, China)

  • Yunjia Liu

    (College of Land Science and Technology, China Agricultural University, Beijing 100193, China)

  • Meng Cao

    (China Construction First Group Corporation Limited, Beijing 100161, China)

  • Yuangfang Huang

    (College of Land Science and Technology, China Agricultural University, Beijing 100193, China)

Abstract

Soil organic matter (SOM) and environmental factors have been shown to have a scale-location dependence relationship. However, few studies have considered the anisotropy, and the scale-location dependence relationship may not be fully characterized. In this study, transects with dominant directions of SOM variability in the dryland farming regions of Songliao Plain, China were extracted by anisotropy analysis. The scale-location specific multivariate relationships between SOM and environmental factors along the two transects were examined using multiple wavelet coherence. Results indicated that the scale and location-specific variations in SOM and environmental factors were direction-specific. The major direction with the most significant SOM variations was 56° east by north, while the minor direction was perpendicular to the major direction. The strongest single factor for explaining SOM variations differed between two dominant directions, sand along the major direction (average wavelet coherence (AWC) = 0.57, percentage area of significant coherence (PASC) = 40.32% at all scales) and bulk density (BD) along the minor direction (AWC = 0.66, PASC = 50.16% at all scales). The combination of mean annual temperature (MAT) and BD was the best to explain SOM variations along the major direction (AWC = 0.78, PASC = 46.23% at all scales). A two-factor combination is adequate to explain SOM variability along the major direction, whereas a single factor is sufficient for the explanation along the minor direction. More factors did not evidently increase or even decrease the percentage of scale-location domains where SOM variations were significantly explained. This work has important implications for developing future sampling strategies and preparing detailed digital soil maps.

Suggested Citation

  • Yuxuan Gou & Dong Liu & Xiangjun Liu & Zhiqing Zhuo & Chongyang Shen & Yunjia Liu & Meng Cao & Yuangfang Huang, 2022. "Scale-Location Dependence Relationship between Soil Organic Matter and Environmental Factors by Anisotropy Analysis and Multiple Wavelet Coherence," Sustainability, MDPI, vol. 14(19), pages 1-15, October.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:12569-:d:932230
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    References listed on IDEAS

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    1. Martin Heimann & Markus Reichstein, 2008. "Terrestrial ecosystem carbon dynamics and climate feedbacks," Nature, Nature, vol. 451(7176), pages 289-292, January.
    2. Eric A. Davidson & Ivan A. Janssens, 2006. "Temperature sensitivity of soil carbon decomposition and feedbacks to climate change," Nature, Nature, vol. 440(7081), pages 165-173, March.
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