healthy land. sustainable future. NOVEMBER / DECEMBER 2010
NUMBER 134
In Search of Perennial Grasses in a Mediterranean Climate—
WWW.HOLISTICMANAGEMENT.ORG
INSIDE THIS ISSUE
MONITORING
The Paicines Ranch by Tracy Favre & Frank Aragona
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n April 2010 we visited the Paicines Ranch in San Benito County California to assist Sallie Calhoun in developing monitoring protocols to measure variables of critical interest to ranch management. In particular, we measured oak tree saplings and seedlings and cataloged them using GIS and simple field measurement techniques because these trees are relatively scarce on the landscape. Various pressures are affecting the ability of oak trees to achieve intermediate size, but the viability and germination of acorns is an unresolved issue. We developed a monitoring protocol to better understand what is happening with acorn germination and oak seedling establishment. We also designed a field methodology on the Paicines Ranch to monitor the relatively rare native perennial grasses to help us determine which factors are likely factors for native perennial establishment. The four factors we identified were aspect, oak trees, soil phosphorus, and soil texture. We then presented three management scenarios as part of the Holistic Management monitoring feedback loop to promote debate and discussion about management possibilities on the Paicines Ranch. We share them in this article in the likely order of feasibility and relative ease of adoption. They include Holistic Management of purple needlegrass, water harvesting/keyline design, and silvopastoral development.
Monitoring for Oak Regeneration In California, the regeneration and establishment of oak trees is an important issue. Literature on the subject suggests that it is common to find seedlings and mature trees, but there is a lack of saplings and intermediate size
trees (McCreary 2009). Research has focused on pressures that may be preventing seedlings from developing into saplings, and has emphasized the detrimental effects of weeds, wildlife herbivory and the grazing, trampling, and rubbing of domestic livestock; this research suggests the use of tree protectors and herbicides to ensure adequate oak regeneration (Adams et al 1997, McCreary and Tecklin 2005). Very few instances of oak saplings and seedlings exist on the Paicines Ranch, so HMI worked with Sallie and Paicines Ranch Manager, Chris Ketcham to monitor the condition and growth of these small trees, and to identify the rare instances of regenerating oak trees. Three oak zones were delineated for those areas where oaks are known to be regenerating. Within these zones, we counted total numbers of seedlings and saplings. Additionally, we identified five saplings within each zone with flash tape, and we recorded and mapped the GPS coordinates of these five saplings as well as noting height in inches from the uphill side. It seems that oak trees, once germinated and established, experience slow and stunted growth. Subsequent years of monitoring will help to clarify the actual growth rates of these trees. We also thought it would be beneficial to provide some protection to select oak trees to ascertain the impact of cattle, feral hogs, and other wildlife on the overall growth of oak saplings in these zones. We could then perform a comparative analysis of annual heights on protected and non-protected trees which would provide useful information on the effectiveness of these approaches. Scarcity of intermediate trees is only one facet of oak regeneration. To date there has not been a CONTINUED ON PAGE 2
Sallie Calhoun, owner of Paicines Ranch, tags oak samplings so they can be identified for future monitoring as part of the monitoring protocol HMI developed for her ranch. To learn more, read the article on this page.
FEATURE STORIES Back to Basics DON CAMPBELL . . . . . . . . . . . . . . . . . . . . . . . .
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Low-Input Grassfed Livestock Production and Planned Grazing for a Triple Bottom Line MATTHEW K. BARNES . . . . . . . . . . . . . . . . . . . .
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A Rewilding Experiment MARY GIRSCH-BOCK . . . . . . . . . . . . . . . . . . . .
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Developing Solution-Focused Research FRANK ARAGONA . . . . . . . . . . . . . . . . . . . . . .
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LAND and LIVESTOCK Modular Food Systems with an International Scope DOUG WARNOCK . . . . . . . . . . . . . . . . . . . . .
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Using Grazing Tools Effectively BEN BARTLETT . . . . . . . . . . . . . . . . . . . . . . . . .
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The Briar Experiment MARK BROWNLEE . . . . . . . . . . . . . . . . . . . . . .
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Beef and Birds on Public Lands— Mob Grazing Event on Jeffery Island MAE ROSE PETREHN . . . . . . . . . . . . . . . . . . . .
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NEWS and NETWORK From the Board Chair . . . . . . . . . . . . . . . . . . . .15 Book Review . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Texas Regional Report . . . . . . . . . . . . . . . . . . .16 Development Corner . . . . . . . . . . . . . . . . . . . .16 Grapevine . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Certified Educators . . . . . . . . . . . . . . . . . . . . . .19 Marketplace . . . . . . . . . . . . . . . . . . . . . . . . . . .20