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Estimation of spatial variability of soil water storage along the south–north transect on China’s Loess Plateau using the state-space approach

  • Soils, Sec 2 • Global Change, Environ Risk Assess, Sustainable Land Use • Research Article
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Abstract

Purpose

Soil water is a critical variable for hydrological and biological processes in arid and semi-arid ecosystems. Information on regional spatial pattern of soil water storage (SWS) and its relationship with environmental factors is important for optimal water management and vegetation restoration in China’s Loess Plateau (CLP) region. State-space approach and artificial neural network (ANN) were used to analyze spatial variability of SWS in the CLP region.

Materials and methods

SWS in the 0–1, 1–2, 2–3, 3–4, and 4–5 m soil layers was measured during the period from June 2013 to September 2015 at 86 locations along a 860 km long south–north transect of CLP.

Results and discussion

The analysis showed that SWS in the 5 m soil profile generally decreased with increasing latitude, driven by decreasing precipitation and soil–water holding capacity. Using various combinations of variables, the state-space model gave a better spatial pattern of SWS than the ANN approach. The best state-space approach, which included clay content, mean annual precipitation, and slope gradient, explained 96.0% of the total variation in SWS. Then, the best ANN approach explained only 76.2% of the variation. Clay content, mean annual precipitation, and slope gradient was the most effective combination for large-scale estimation of SWS under the state-space approach.

Conclusions

The state-space model was recommended as an effective method for analyzing large-scale spatial patterns of soil water using soil, climatic, and topographic properties in the CLP region.

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Acknowledgements

This research was supported by the National Natural Science Foundation of China (Nos. 41530854, 41571130081 and 41501233), the National Key Project for Research and Development (2016YFC0501605), and the Program for Bingwei Excellent Talents in the Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences (2015RC204). We thank the editor and reviewers for their comments and suggestions, which were used to standardize the quality of the paper.

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Correspondence to Ming’an Shao or Xiaoxu Jia.

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Zhao, C., Shao, M., Jia, X. et al. Estimation of spatial variability of soil water storage along the south–north transect on China’s Loess Plateau using the state-space approach. J Soils Sediments 17, 1009–1020 (2017). https://doi.org/10.1007/s11368-016-1626-8

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