Effect of rock fragment cover on nutrient loss under varied rainfall intensities: A laboratory study

Research output: Contribution to journalArticle

Abstract

Surface rock fragments retard overland flow discharge, reduce the runoff generation rate and soil erosion as well as nutrients loss. In Northwest China, a common method for minimizing water, soil, and nutrient losses is the use of rock fragment cover. We used lab stimulation testing to evaluate rock fragment cover efficacy for nutrient conservation. Nutrient losses were determined in both the runoff and sediments under three rain intensities (30, 60 and 90 mm·h1), four rock fragment covers (0, 10, 20 and 30%) and a slope of 10. The results showed that rock fragment cover significantly reduced the nutrient losses. Compared with the bare soil control, the rock fragment cover reduced the runoff volume and sediments by 18-38 and 11-69%, respectively, and reduced N and P losses by 9-43 and 16-70%, respectively. These results indicate that rock fragment cover is an effective method for reducing land degradation and improving local environmental conditions.

Details

Authors
  • Hanzhi Li
  • Dengxing Fan
  • Jianzhi Niu
  • Guodong Jia
  • Jiamei Sun
  • Xinxiao Yu
  • Linus Zhang
Organisations
External organisations
  • Beijing Forestry University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Physical Geography

Keywords

  • Nutrient loss, Rock fragment cover, Simulated rainfall, Soil, Water conservation
Original languageEnglish
Pages (from-to)390-406
Number of pages17
JournalHydrology Research
Volume49
Issue number2
StatePublished - 2018 Apr 1
Publication categoryResearch
Peer-reviewedYes