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Rainstorm events increase risk of soil salinization in a loess hilly region of China

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  • Ke, Zengming
  • Liu, Xiaoli
  • Ma, Lihui
  • Feng, Zhe
  • Tu, Wen
  • Dong, Qin’ge
  • Jiao, Feng
  • Wang, Zhanli

Abstract

Soil salinization is widespread and it hinders agricultural development in the loess hilly region of China. In this study, we determined the dynamic distribution of the soil salinity (SS) as well as its effects on maize (Zea mays L.) after rainstorm events in two land types produced by excavation and sediment deposition. Four treatments were tested comprising sediment deposited farmland without plastic mulch (S1) and with plastic mulch (S2), and excavated farmland without plastic mulch (E1) and with plastic mulch (E2). The results showed that the dynamic distribution of the SS exhibited similar characteristics included leaching, rapid accumulation, and relatively stability in the 0–40 cm soil layer after rainstorm events. A turning point where the leaching and accumulation of SS reached a balance in the 0–40 cm layer occurred on about the 4th day under the no plastic mulch treatments and on the 6th day under the plastic mulch treatments. The SS reached a relatively stable condition in the whole soil layer on the 12th day. Rainstorm events increased the accumulated SS by 0.36, 0.08, 0.44, and 0.20 g kg–1 under E1, E2, S1, and S2, respectively, during the year. Plastic mulch treatments decreased the average accumulated SS by 66.7% and the average SS by 22% by reducing water infiltration and soil evaporation. The average SS and accumulated SS in sediment deposited farmland were 8.9% and 47.6% higher, respectively, than those in excavated farmland because of the lower depth of the groundwater influence zone and more abundant capillary pores in the sediment deposited farmland. The average SS in the whole soil layer followed the order of: S1 (0.72 g kg–1) > E1 (0.62 g kg–1) > E2 (0.53 g kg–1) > S2 (0.52 g kg–1) (P < 0.05), and these levels did not limit maize growth. However, the two land types without plastic mulch would be transformed into severe saline–alkali land after 10 years. Therefore, we conclude that E2 is the optimal treatment for this region because it resulted in the lowest accumulated SS. Our results are important for understanding the SS dynamics and controlling soil salinization after rainstorm events.

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  • Ke, Zengming & Liu, Xiaoli & Ma, Lihui & Feng, Zhe & Tu, Wen & Dong, Qin’ge & Jiao, Feng & Wang, Zhanli, 2021. "Rainstorm events increase risk of soil salinization in a loess hilly region of China," Agricultural Water Management, Elsevier, vol. 256(C).
    • Handle: RePEc:eee:agiwat:v:256:y:2021:i:c:s0378377421003462
    DOI: 10.1016/j.agwat.2021.107081
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    1. Jianxia Yang & Jun Zhao & Guofeng Zhu & Yuanyuan Wen & Yanqiang Wang & Jialiang Liu & Zhihui Yang, 2022. "Effects of Ecological Water Conveyance on Soil Salinization in the Shiyang River Basin’s Terminal Lake—Qingtu Lake—Area," Sustainability, MDPI, vol. 14(16), pages 1-11, August.
    2. Zengming Ke & Xiaoli Liu & Lihui Ma & Feng Jiao & Zhanli Wang, 2023. "Spatial Distribution of Soil Water and Salt in a Slightly Salinized Farmland," Sustainability, MDPI, vol. 15(8), pages 1-15, April.

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