NDLI: CT-measured macropores as affected by agroforestry and grass buffers for grazed pasture systems

Content Provider	Springer Nature Link
Author	Kumar, Sandeep Anderson, Stephen H. Udawatta, Ranjith P. Gantzer, Clark J.
Copyright Year	2010
Abstract	Agroforestry and grass buffers have been proposed for improving water quality in watersheds. Soil porosity can be significantly influenced by buffer vegetation which affects water transport and water quality. The objective of the study was to compare differences in computed tomography (CT)-measured macroporosity (>1,000-μm diam.) and coarse mesoporosity (200- to 1,000-μm diam.) parameters for agroforestry and grass buffer systems associated with rotationally grazed and continuously grazed pasture systems. Soils at the site were Menfro silt loam (fine-silty, mixed, superactive, mesic Typic Hapludalf). Six replicate intact soil cores, 76.2 mm diam. by 76.2 mm long, were collected using a core sampler from the four treatments at five soil depths (0–50 cm at 10-cm intervals). Images were acquired using a hospital CT scanner and subsequently soil bulk density and saturated hydraulic conductivity (K sat) were measured after scanning the cores. Image-J software was used to analyze five equally spaced images from each core. Bulk density was 5.9% higher and saturated hydraulic conductivity (K sat) values were five times lower for pasture treatments relative to buffer treatments. For the 0–10 cm soil depth, CT-measured soil macroporosity (>1,000 μm diam.) was 13 times higher for the buffer treatments compared to the pasture treatments. Buffer treatments had greater macroporosity (0.020 m3 m−3) compared to pasture (0.0045 m3 m−3) treatments. CT-measured pore parameters were positively correlated with K sat. The project illustrates benefits of agroforestry and grass buffers for maintaining soil porosity critical for soil water and nutrient transport.
Starting Page	59
Ending Page	65
Page Count	7
File Format	PDF
ISSN	01674366
Journal	Agroforestry Systems
Volume Number	79
Issue Number	1
e-ISSN	15729680
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-01-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Agroforestry buffer (AgB) Computed tomography (CT) Continuously grazed pasture (CG) Grass buffer (GB) Macroporosity Mesoporosity Rotationally grazed pasture (RG) Agriculture Forestry
Content Type	Text
Resource Type	Article
Subject	Forestry Agronomy and Crop Science

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CT-measured macropores as affected by agroforestry and grass buffers for grazed pasture systems

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