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Erosion hazard evaluation for soil conservation planning that sustains life expectancy of A horizon: the Black Soil Region of China
  • Tianyu Zhang
Tianyu Zhang
Northeast Normal University
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Abstract

The black soil region of northeast China is one of the most productive regions of the world. The depth of A horizon is rapidly decreasing due to excessive erosion. A strategy for erosion hazard evaluation and soil conservation planning has been proposed and tested on the region. Climate, geomorphology, DEM, soil, landuse, runoff plot and corn yield data were compiled. Soil erosion rate, A horizon thickness and corn yield under six conservation scenarios during 2020~2200 was predicted. The six scenarios include Present (continue present practices), Contour (contour tillage), Straw (straw incorporated in tillage layer), Combo 1 (contour tillage and terracing etc.), No-till (no-till farming) and Combo 2 (partially Combo 1 and partially No-till). Current soil life expectancy of A horizon (SLEA), which is the time until a critical horizon thickness needed for sustaining crop production is reached, was calculated for each scenario. Erosion hazard degrees were determined with SLEA. Croplands with SLEA of <0 a, 0 a~20 a, 20 a~100 a, 100 a~1000 a and ≥1000 a, were classified as “Damaged”, “High hazard”, “Moderate hazard”, “Low hazard” and “No hazard”, respectively. Current area ratio of “Damaged” and “High hazard” and “Moderate hazard” was found to be 8%, 5%, and 22%, respectively. The optimum conservation practice was found to be No-till for “Damaged”, “Combo 2” for “High hazard”, “Moderate hazard” and “Low hazard” and Present for “No hazard”. An optimum conservation schedule was also suggested for each township to maintain all soils to have an A horizon above 20 cm.

Peer review status:IN REVISION

08 May 2020Submitted to Land Degradation & Development
08 May 2020Submission Checks Completed
08 May 2020Assigned to Editor
18 May 2020Reviewer(s) Assigned
02 Jun 2020Review(s) Completed, Editorial Evaluation Pending
03 Jun 2020Editorial Decision: Revise Major
23 Jun 20201st Revision Received
23 Jun 2020Assigned to Editor
23 Jun 2020Submission Checks Completed
31 Jul 2020Review(s) Completed, Editorial Evaluation Pending
11 Aug 2020Editorial Decision: Revise Major
21 Sep 20202nd Revision Received
22 Sep 2020Assigned to Editor
22 Sep 2020Submission Checks Completed