Effects of soil conservation techniques on soil erosion and runoff: A global analysis

Authors: Muqi Xiong*, , Ranhao Sun, State Key Laboratory of Urban and Regional Ecology, Liding Chen, University of Chinese Academy of Sciences
Topics: Soils
Keywords: erosion, runoff
Session Type: Paper
Day: 4/5/2019
Start / End Time: 1:10 PM / 2:50 PM
Room: Jackson, Marriott, Mezzanine Level
Presentation File: No File Uploaded

Water erosion control is one of the most important ecosystem services provided by soil conservation tech-niques (SCTs), which are being widely used to alter soil and water processes and improve ecosystem ser-vices. But few studies have focused on providing this service using various techniques across the world. Here, a comprehensive review was conducted to compare the effects of SCTs on water erosion control. We conducted a meta-analysis consisting of 1589 sample plots in 22 countries to identify SCTs, which we classified into three groups: biological techniques (BTs, such as afforestation and grain for green), soil man-agement techniques (STs, such as no tillage and soil amendment), and engineering techniques (ETs, such as terraces and contour bunds). Our results were as follows: (1) The SCTs had significant positive effects on water erosion control, and they were generally more effective at reducing annual soil loss (84%) than at re-ducing annual runoff (53%). (2) The BTs (e.g., 88% for soil and 55% for runoff) were generally more effective at reducing soil and water loss than ETs (e.g., 86% for soil and 44% for runoff) and STs (e.g., 59% for soil and 48% for runoff). (3) On bare lands, the efficiency of water erosion control decreased as the terrain slope in-creased, but this value increased as the slope increased on croplands and orchards. Furthermore, the effects of SCTs on runoff and soil loss reduction were most efficient on 25°–40° slopes in croplands and on 20°–25° slopes in orchards. (4) The SCTs were more efficient on

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