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Silvopastures may have the potential to increase forage yields beneath trees compared to open pasture at some sites. This has been attributed to a combination of factors including improved water use efficiency by shaded grass and increased water availability through hydraulic lift by trees. The objectives of this research were to determine if silvopastures changed forage mass production and available soil water, and to determine how these two factors were related. Forage mass and soil water were sampled at 1.0, 2.0, and 3.6 m from the tree stem, or plot center under honey locust ( Gleditsia triacanthos L.), black walnut ( Juglans nigra L.) and shade cloth in 2006 and 2007. Soil water was measured in the top 10 cm of soil using a capacitance probe, and at 30-cm intervals, from 45 to 105 cm, using a neutron probe. Forage was collected to determine dry mass and annual yield. In 2006, forage mass was greater under black walnuts and honey locusts than under 70% shade cloth. In 2007, with a 50% shade cloth, forage growth was similar in all treatments. In both 2006 and 2007, soil moisture in the top 10 cm was higher under shade cloth compared to honey locust or black walnut trees. Similarities in forage mass between treatments in 2007 indicate that the differences in soil water were not biologically significant for forage growth. Lower forage mass under the 70% shade cloth in 2006 was due to suppressed growth from intense shading. The major implication for pasture managers is that trees in these pastures had no negative effect on soil water availability and forage growth.
Agroforestry Systems – Springer Journals
Published: Oct 1, 2011
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