Interactions Between Cattle and Forestry on Montane and Foothill - - PowerPoint PPT Presentation

Interactions Between Cattle and Forestry on Montane and Foothill Landscapes

• f Alberta

Jillian Kaufmann, MSc, PAg 2018 CIF-IFC Conference

Outline

´ Background ´ Research Objectives ´ Study Design ´ Results and Discussion ´ Management Implications

Background

´ Alberta forested public lands simultaneously support livestock grazing and forestry operations ´ Potential integration challenges:

´ Damage to young trees ´ Regeneration failure ´ Altered forage composition, production and accessibility ´ Grazing system interruption ´ Loss in profits

Background – Study Purpose

´ Facilitate successful integration of grazing and forestry

• n public lands

´ Contribute to development of best management practices ´ Partners

´ Rocky Mountain Forest Range Association ´ Alberta Sustainable Resource Development (now AEP) ´ University of Alberta ´ Alberta Beef Producers ´ Weyerhaeuser ´ Spray Lakes Sawmill ´ West Central Forage Association ´ Forest Resource Improvement Association of Alberta

Research Objectives

´ Observe cattle use of landscapes containing recently harvested cut blocks

´ Habitat preference ´ Foraging behavior ´ Influence of cattle stocking rate

´ Quantify cattle induced damage to young trees

Lower Foothills Study Site

´ Grazing lease near Logdepole, Alberta ´ Primarily deciduous – aspen, balsam poplar, paper birch ´ Timber harvested by Weyerhaeuser in January 2006 ´ Primarily natural regeneration with white spruce planting on haul roads ´ Four paddocks (each 2.5 – 3 ha) constructed containing areas of clear cut, partial harvest, haul road, uncut forest and brush piles ´ Grazing exclosures (0.2 ha) established within paddocks ´ Cattle grazed at low (0.3 AUM/ha) and high (0.6 AUM/ha) stocking rates

Montane Study Site

´ Rocky Mountain Forest Reserve grazing allotment near Maycroft ´ Three large pastures ranging 365 to 1035 ha ´ Six major habitat types:

´ Coniferous forest ´ Deciduous forest ´ Mixed wood forest ´ Native upland grassland ´ Modified lowland grasslands ´ Coniferous cut blocks harvested in winter 2005/2006 by Spray Lakes Sawmill

´ Cut blocks planted to lodgepole pine or white spruce ´ Herd of 320 cattle grazed pastures July through September 2008 & 2009 ´ Cattle stocking rate ranged from 0.4 to 0.6 AUM/ha ´ Cattle exclusion cages (1.5 x 1.5 m) set up in each habitat type

Data Collection

´ Cattle fitted with GPS collars to track location every 5 to 10 minutes ´ Network of circular 10 m2 plots established throughout pastures

´ Foothills site - total of 233 permanent plots 10 to 30 m apart throughout all habitat types ´ Montane site – total of 210 plots distributed throughout habitat types

´ Plot data collected following grazing ´ Data parameters:

´ Cattle occupancy ´ Forage biomass, utilization and quality ´ Slope, aspect, elevation, canopy cover ´ Distance to roads and water ´ Slash cover, maximum height and distance to nearest grazing patch ´ Tree regeneration counts, maximum height and diameter, tree impedance rating and record of cattle induced damage

´ Plots established within grazing exclosures at the Foothills site to compare tree regeneration and growth

Data Analysis

´ GPS collar data cleaned and overlain on spatial maps of habitat types ´ Cattle locations used to calculate habitat preference using an electivity index ´ Plot data used to link evidence of cattle presence to environmental characteristics ´ Assessment of tree regeneration success and cattle induced impacts

Results – Cattle Habitat Preference Foothills Site

Results – Cattle Habitat Use Foothills Site

Results – Drivers of Forage Use Foothills Site

´ Cattle foraging behavior was influenced primarily by forage biomass and distance to water ´ Forage protein, slash cover and sapling density had a relatively small influence on cattle foraging behavior ´ Forage use was positively associated with greater forage biomass and better quality, and negatively associated with greater distance to water, slash cover and sapling density

Results – Tree Regeneration and Damage Foothills Site

Results – Sapling Damage Foothills Site

Results – Cattle Habitat Preference Montane Site

Results – Cattle Habitat Use Montane Site

Results – Drivers of Habitat Use Montane Site

´ At the local patch scale:

´ Cattle foraging behavior was influenced primarily by forage biomass ´ Distance to water and roads, forage quality, slope and aspect had a relatively small influence on cattle foraging behavior ´ Forage use was positively associated with greater forage biomass and quality and distance to roads ´ Forage use was negatively associated with greater distance to water, slope and aspect (representing less forage use on north-facing slopes)

´ At the larger landscape scale:

´ Slope, distance to water and distance to roads were the main parameters influencing cattle selection

´ Specifically within cut blocks, topography (primarily elevation) had the greatest influence on cattle presence ´ Forage quality played a greater role in regulating cattle presence within cut blocks than forage biomass ´ Distance to water was also a key factor explaining cattle use of cut blocks

Results – Cattle Use of Cut Blocks Montane Site

Results – Tree Regeneration and Damage Montane Site

Conclusions and Management Implications

´ Application of cattle stocking rates mandated by AEP promote successful integration of grazing and forestry ´ Cattle are unlikely to spend much time in recently harvested cut blocks provided they have access to more preferred habitats ´ Understanding cattle foraging behavior is imperative to preventing negative impacts ´ Timing of grazing needs to be considered – a single mid summer grazing allows time for stem lignification and improved strength ´ Forestry and cattle grazing were found to be compatible land uses in this study based on sustainable management ´ Provincial regeneration standards were met or surpassed for the most part. Regeneration inadequacies were not associated with cattle activity

Questions?