soil aggregate stability in rangelands
Download
Skip this Video
Download Presentation
Soil Aggregate Stability in Rangelands

Loading in 2 Seconds...

play fullscreen
1 / 15

Soil Aggregate Stability in Rangelands - PowerPoint PPT Presentation


  • 178 Views
  • Uploaded on

Soil Aggregate Stability in Rangelands. Leonard Cratic Mentor: Jeff Stone USDA-ARS SWRC U NIVERSITY OF. Introduction. Erosion is a process which impacts the sustainability of rangelands. There is a need to develop simple tools to evaluate sustainability of rangelands.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Soil Aggregate Stability in Rangelands' - hazel


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
soil aggregate stability in rangelands

Soil Aggregate Stability in Rangelands

Leonard Cratic

Mentor: Jeff Stone

USDA-ARS SWRC

UNIVERSITY OF

introduction
Introduction

Erosion is a process which impacts the sustainability of rangelands.

There is a need to develop simple tools to evaluate sustainability of rangelands.

problem statement
Problem Statement

Two methods being used to estimate runoff ratio and erosion:

Direct measurement

  • Rainfall simulation
  • Expensive and time consuming

Indirect measurement

  • Slake testing
  • Measures soil aggregate stability
  • Quick and inexpensive
objectives
Objectives

Assess the influence of plant cover on soil slake.

Determine whether correlations exist between soil slake and runoff and erosion.

methods
Methods

Rainfall simulation

  • Rainfall is applied to a 2x6 meter plot and runoff and erosion is measured.
  • Four plots per site
soil aggregate stability
Soil Aggregate Stability

Measures how well a soil ped retains its structure in water

  • Soil stability kit
  • 18 samples per plot
  • Presence of plants noted and soil samples ranked 1-6 (unstable-stable)
study areas
Study Areas

Loamy Uplands ecological site

    • Soil-vegetation association
  • 5 sites evaluated in Southeastern Arizona
  • From observations
    • ER2 and KREE are most stable
    • ER4G and ER4S are moderately stable
    • ER3 is least stable
analysis
Analysis

Slake evaluated using a t-test

  • Under and outside canopy
  • Among study sites

Regression analysis (slake vs. rainfall simulation)

  • Slake vs. runoff ratio
    • Runoff ratio = runoff / precip.
  • Slake vs. sediment yield
    • Sediment yield = sy / precip. / slope
under vs outside canopy
Under vs. Outside Canopy

Means are significantly different if letters are different

slake among sites
Slake Among Sites

Means are significantly different if letters are different

conclusions
Conclusions
  • Soil that was protected by canopy cover had more stable aggregates.
  • Significant differences in slake were between ER4S, ER2 and KREE.
  • No correlation was found between slake and runoff ratio.
  • A negative correlation was found between slake and sediment yield.
  • The addition of more data will help to strengthen the validity of using slake testing for erosion assessment.
acknowledgements
Acknowledgements

Susan Brew

Jeff Stone

Chandra Holifield Collins

Rae Gomez-Pond

Jared Buono

Jonathan Krattickk Jakucki

ad