Predicting soil erosion for alternative land uses

Erda Wang, Chang Xin, Jimmy R. Williams, Cheng Xu

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The APEX (Agricultural Policy-Environmental extender) model developed in the United States was calibrated for northwestern China's conditions. The model was then used to investigate soil erosion effects associated with alternative land uses at the ZFG (Zi-Fang-Gully) watershed in northwestern China. The results indicated that the APEX model could be calibrated reasonably well (±15% errors) to fit those areas with >50% slope within the watershed. Factors being considered during calibration include runoff, RUSLE (Revised Universal Soil Loss Equation) slope length and steepness factor, channel capacity flow rate, floodplain saturated hydraulic conductivity, and RUSLE C factor coefficient. No changes were made in the APEX computer code. Predictions suggest that reforestation is the best practice among the eight alternative land uses (the status quo, all grass, all grain, all grazing, all forest, half tree and half grass, 70% tree and 30% grain, and construction of a reservoir) for control of water runoff and soil erosion. Construction of a reservoir is the most effective strategy for controlling sediment yield although it does nothing to control upland erosion. For every 1 Mg of crop yield, 11 Mg of soil were lost during the 30-yr simulation period, suggesting that expanding land use for food production should not be encouraged on the ZFG watershed. Grass species are less effective than trees in controlling runoff and erosion on steep slopes because trees generally have deeper and more stable root systems.

Original languageEnglish
Pages (from-to)459-467
Number of pages9
JournalJournal of Environmental Quality
Volume35
Issue number2
DOIs
Publication statusPublished - Mar 1 2006

Fingerprint

Land use
soil erosion
Erosion
agricultural policy
Revised Universal Soil Loss Equation
Soils
land use
Watersheds
Runoff
grass
watershed
gully
runoff
erosion
Reforestation
reforestation
sediment yield
food production
root system
crop yield

All Science Journal Classification (ASJC) codes

  • Environmental Engineering
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Management, Monitoring, Policy and Law

Cite this

Predicting soil erosion for alternative land uses. / Wang, Erda; Xin, Chang; Williams, Jimmy R.; Xu, Cheng.

In: Journal of Environmental Quality, Vol. 35, No. 2, 01.03.2006, p. 459-467.

Research output: Contribution to journalArticle

Wang, E, Xin, C, Williams, JR & Xu, C 2006, 'Predicting soil erosion for alternative land uses', Journal of Environmental Quality, vol. 35, no. 2, pp. 459-467. https://doi.org/10.2134/jeq2005.0063
Wang, Erda ; Xin, Chang ; Williams, Jimmy R. ; Xu, Cheng. / Predicting soil erosion for alternative land uses. In: Journal of Environmental Quality. 2006 ; Vol. 35, No. 2. pp. 459-467.
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