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Spatial heterogeneity of soil fertility in coastal zones: a case study of the Yellow River Delta, China

  • Soils, Sec 5 • Soil and Landscape Ecology • Research Article
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Abstract

Purpose

At the intersection of land and sea, coastal zones are unstable areas that can suffer intensive coastal erosion or sedimentation. The Yellow River Delta, which has experienced rapid land growth, is of great significance in soil fertility research.

Materials and methods

To qualitatively and quantitatively analyse the basic soil fertility characteristics of coastal zones, we sampled six soil chemical indicators obtained from the Yellow River Delta in July 2019. Principal component analysis (PCA) and the Nemoro quality index (NQI) were integrated for the geostatistical analysis of soil fertility by using the ArcGIS and SPSS software.

Results and discussion

The NQI, modified NQI (mNQI) and PCA results significantly represented soil fertility, and the mNQI performed better than the NQI. The soil fertility met the classification of ‘III, generally fertile’. The main factors affecting soil fertility were total potassium, total nitrogen and organic matter. The soil fertility indexes declined consistently from west to east. Increasing distance from the sea significantly negatively affected soil fertility, while soil fertility positively impacted land productivity.

Conclusions

Therefore, future agricultural planning should focus on soil total nitrogen, total potassium and organic matter and control salinization to improve land productivity. The eastern coastal zone, especially the south-eastern region, should be the first area of focus.

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Data availability

All data and calculation tools are available from the author Youxiao Wang (youxao_wang@163.com).

References

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Funding

This research was supported by the National Key R&D Program of China, Grant No. 2017YFD0300403; the Strategic Priority Research Program of Chinese Academy of Sciences, Grant No. XDA23050101; and the National Natural Science Foundation of China, Grant No. 42001227.

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Authors

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Correspondence to Gaohuan Liu.

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Conflict of interest

The authors declare no competing interests.

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Responsible editor: Jun Zhou

The work described is an original research that has not been published previously and is not under consideration for publication elsewhere in whole or in part.

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Wang, Y., Liu, G. & Zhao, Z. Spatial heterogeneity of soil fertility in coastal zones: a case study of the Yellow River Delta, China. J Soils Sediments 21, 1826–1839 (2021). https://doi.org/10.1007/s11368-021-02891-5

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  • DOI: https://doi.org/10.1007/s11368-021-02891-5

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