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Estimation and Restoration of Dried Soil Layers in the Slope-gully Unit of the Chinese Loess Plateau
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  • Shuang Dong,
  • Xiangguo Fan,
  • Yuhua Jia,
  • Jingling Zhang
Shuang Dong
Tongren Polytechnic College
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Xiangguo Fan
Tongren University
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Yuhua Jia
Shenyang Agricultural University

Corresponding Author:[email protected]

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Jingling Zhang
Shenyang University of Technology
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Abstract

Dried soil layer (DSL) is a common phenomenon forms by soil moisture deficiency in the Chinese Loess Plateau (CLP). In order to reveal the temporal stability and elimination degree of DSLs, we obtained the 19 occasions data of soil water content (SWC) at 15 observation sites in a typical slope-gully unit. The available soil moisture (ASM) and DSL were estimated by representative sites which determined through the temporal stability method, and then assessed the reliability of simulation equations between representative locations condition and mean conditions of the study area. Results show that: (1) The temporal dynamics of DSL were characterized with somewhat complexity. The ASM within the DSL (DSL-ASM), ASM within the sandwiched dried soil layer (SDSL-ASM) and quantitative index (QI) varied within the range of 2.75%–3.11%, 2.98%–4.22% and 0.254–0.356, respectively. (2) The possibility of development and recovery for DSL and SDSL in deep layers were less than that in surface layers. The maximum depth of DSL (DSLMD) was significantly and negatively related to the SDRD of DSL-ASM, the maximum depth of SDSL (SDSLMD) was negatively related to the SDRD of SDSL-ASM. (3) The prediction results of ASM above 300 cm depth were more accurate than other layers ( R 2=0.89). The DSL-ASM has a more prediction accurate than SDSL-ASM and QI. On the analysis of the time stability characteristics of ASM and dried soil layers, A2 and C3 can better represent the mean conditions of ASM at the depth of three and four soil layers, respectively. C2, A1 and A1 can better represent the average levels of DSL-ASM, SDSL-ASM and QI, respectively ( R 2=0.43, 0.14 and 0.18). (4) The restoration degrees of DSLs mainly showed no elimination and slight elimination, the DSLs cannot be completely eliminated within a short time. Scientific regulation of soil moisture can alleviate the formation and development of DSLs a certain extent, and provide the possibility for DSLs restoration.
09 Jun 2024Submitted to Hydrological Processes
09 Jun 2024Submission Checks Completed
09 Jun 2024Assigned to Editor
12 Jun 2024Reviewer(s) Assigned
04 Jul 2024Review(s) Completed, Editorial Evaluation Pending
13 Jul 2024Editorial Decision: Revise Major
27 Aug 20241st Revision Received
06 Sep 2024Submission Checks Completed
06 Sep 2024Assigned to Editor
06 Sep 2024Reviewer(s) Assigned
06 Sep 2024Reviewer(s) Assigned
06 Oct 2024Review(s) Completed, Editorial Evaluation Pending
07 Oct 2024Editorial Decision: Revise Minor
11 Oct 20242nd Revision Received
14 Oct 2024Submission Checks Completed
14 Oct 2024Assigned to Editor
14 Oct 2024Reviewer(s) Assigned
14 Oct 2024Review(s) Completed, Editorial Evaluation Pending
14 Oct 2024Editorial Decision: Accept