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Journal of Soils and Sediments

, Volume 19, Issue 1, pp 366–372 | Cite as

Development of pedotransfer functions for predicting the bulk density in the critical zone on the Loess Plateau, China

  • Jiangbo Qiao
  • Yuanjun ZhuEmail author
  • Xiaoxu Jia
  • Laiming Huang
  • Ming’an Shao
Soils, Sec 5 • Soil and Landscape Ecology • Research Article
  • 96 Downloads

Abstract

Purpose

The bulk density (BD) is an important physical property of soil, which is used to estimate soil carbon/nutrient reserves, and it is an important parameter in various predictive and descriptive models. However, BD data are lacking due to the difficulty of measuring it directly. Pedotransfer function (PTF) may provide an alternative method for estimating BD indirectly based on easily measured soil properties. The Loess Plateau in China (620,000 km2) has deep loess deposits (50–200 m), which makes it difficult to obtain BD values for the deep soil layer, and thus, a PTF is needed for estimating BD.

Materials and methods

In this study, multiple linear regression (MLR) and artificial neural network (ANN) methods were used to develop BD PTFs for the deep layer of the Loess Plateau based on the soil organic carbon, texture, and depth. In total, 534 undisturbed soil cores were obtained by soil core drilling from five typical sites, ranging from the top of the soil profile to the bedrock.

Results and discussion

The BD values all exhibited low variation (CV < 10%). Pearson’s correlation coefficient analysis showed that BD had significant correlations with the sand, silt, clay, soil organic carbon (SOC), and depth (P < 0.01). The performance of MLR was similar to that of the ANN method. The soil depth and clay were also important input variables for the BD PTF. The PTF developed in this study performed better than existing BD PTFs.

Conclusions

In this study, we developed the first BD PTF for the deep layer (50–200 m) of the Loess Plateau.

Keywords

Artificial neuron network Bulk density Multiple linear regression Pedotransfer function 

Notes

Acknowledgements

The authors thank the editor and reviewers for their valuable comments and suggestions.

Funding information

This study was supported by the National Natural Science Foundation of China for a major international cooperation program between China and England (41571130081), the National Natural Science Foundation of China (41371242 and 41530854), and the National Key Research and Development Program of China (2016YFC0501706-03).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Jiangbo Qiao
    • 1
  • Yuanjun Zhu
    • 2
    Email author
  • Xiaoxu Jia
    • 3
  • Laiming Huang
    • 3
  • Ming’an Shao
    • 2
    • 3
  1. 1.College of Resources and EnvironmentNorthwest A&F UniversityYanglingChina
  2. 2.State Key Laboratory of Soil Erosion and Dryland Agriculture on the Loess PlateauNorthwest A&F UniversityYanglingChina
  3. 3.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina

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