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Measuring Plant Diversity in the Tall Threetip Sagebrush Steppe: Influence of Previous Grazing Management Practices

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Measuring Plant Diversity in the Tall Threetip Sagebrush Steppe: Influence of Previous Grazing Management Practices DOI: 10.1007/s00267-003-0073-7 Measuring Plant Diversity in the Tall Threetip Sagebrush Steppe: Influence of Previous Grazing Management Practices STEVEN S. SEEFELDT* by confining our discussion to the sample area only. There SCOTT D. MCCOY were a total of 84 species in the sampled areas with 69 in the United States Department of Agriculture–Agriculture spring-grazed area and 70 each in the fall- and ungrazed ar- Research Service eas. Vegetation within plots was equally rich and even with United States Sheep Experiment Station similar numbers of abundant species. The spring-grazed HC 62 Box 2010 plots, however, had half as much plant cover as the fall- and Dubois, Idaho 83423, USA ungrazed plots and the spring-grazed plots had the largest proportion of plant cover composed of introduced (27%) and ABSTRACT / In July 2000, a 490-ha wildfire burned a portion annual (34%) plants. The fall-grazed plots had the highest pro- of a long-term grazing study that had been established in portion of native perennial grasses (43%) and the lowest pro- 1924 at the US Sheep Experiment Station north of Dubois, portion of native annual forbs (1%). The ungrazed plots had Idaho, USA. Earlier vegetation measurements in this tall the lowest proportion of introduced plants (4%) and the high- threetip sagebrush (Artemisia tripartita spp. tripartita) bunch- est proportion of native perennial forbs (66%). The vegetation grass plant community documented significant changes in of spring-grazed plots is in a degraded condition for the envi- vegetation due to grazing and the timing of grazing by sheep. ronment and further degradation may continue, with or with- A study was initiated in May 2001 using 12 multiscale modi- out continued grazing or some other disturbance. If ecosys- fied Whittaker plots to determine the consequences of previ- tem condition was based solely on plant diversity and only a ous grazing practices on postfire vegetation composition. Be- count of species numbers was used to determine plant diver- cause there was only one wildfire and it did not burn all of the sity, this research would have falsely concluded that grazing original plots, the treatments are not replicated in time or and timing of grazing did not impact the condition of the space. We reduce the potential effects of psuedoreplication ecosystem. In the summer of 2000, wildfire burned a portion of intensity history (over 70 years of studies) and because a long-term grazing study. The grazing study had been tall threetip sagebrush will occasionally resprout after established in 1924 at the US Sheep Experiment Sta- fire (Blaisdell and others 1982), this site lent itself well tion (USSES) north of Dubois, Idaho, USA (Craddock to a study of post-fire vegetation recovery in the sage- and Forsling 1938) in a tall threetip sagebrush (Artemi- brush steppe. sia tripartita spp. tripatita) bunchgrass community. Ear- Although wildfire is a natural part of the sagebrush lier vegetation studies (Mueggler 1950, Laycock 1967, steppe ecosystem (Blaisdell and others 1982), landown- Bork and others 1998) at this location documented ers and federal agencies have actively suppressed it significant changes in vegetation due to sheep grazing while encouraging prescribed fire to increase grazable and the timing of grazing. These studies concluded that forage. The resultant changes in fuel loads, combined spring grazing reduced perennial herbs and increased with fragmentation of the native vegetation by roads, annual herbs and sagebrush cover compared to fall and farms, and urban areas, utilization of the remaining no grazing. In addition, fall grazing decreased sage- range by livestock, and invasion by introduced plants, brush cover compared to spring grazing and no graz- has impacted the overall function of this ecosystem in ing. Given its well-documented vegetation and grazing ways largely unknown. Some research has been conducted to determine successional changes following fire in the sagebrush KEY WORDS: Biodiversity; Seasonal grazing; Wildfire; Modified Whit- taker plots; Sagebrush steppe; Tall threetip sagebrush steppe. In west-central Utah, with a Clementsian model, Barney and Frischknecht (1974), using data collected Published online September 29, 2003. from sites that had burned at different times, con- *Author to whom correspondence should be addressed, email: cluded that an annual weedy stage was followed by a [email protected] perennial grass/forb stage 3 or 4 years after a fire. Environmental Management Vol. 32, No. 2, pp. 234–245 © 2003 Springer-Verlag New York Inc. Plant Diversity in Sagebrush Steppe 235 These sites were next dominated by big sagebrush (Ar- history, and (2) determine the usefulness of diversity in- temisia tridentata) about 35 years after fire, Utah juniper dices in measuring vegetation in the sagebrush steppe. (Juniperus osteosperma) about 70 years after fire, and reached a climax juniper woodland 85–90 years after Materials and Methods fire. The development time of these stages varied con- siderably depending on the size and timing of the burn, Research was conducted during June and July of weather, grazing, and seed dissemination. The weedy 2001 (one year after burn) at the US Sheep Experiment annual phase might not occur if the area had a healthy Station, approximately 10 km north of Dubois, Idaho, component of perennial grasses and forbs prior to the in the Upper Snake River plain (44°14'44Љ N latitude, burn. In a study following a controlled burn in moun- 112°12'47Љ W. Longitude). The site is at an elevation of tain big sagebrush (A. tridentata spp. vaseyana) steppe in 1650 m and is in the northeastern part of the sagebrush southeastern Idaho, the annual weedy stage was steppe region (West 1983). The vegetation is a mix of skipped, where over 33% of the prefire biomass was tall threetip sagebrush, bluebunch wheatgrass (Pseudor- perennial grasses and forbs (Harniss and Murray 1973). oegneria spicata ssp. spicata), and arrowleaf balsamroot Sagebrush levels began to increase after 12 years and (Balsamorhiza sagittata). Soils are fine-loamy, mixed, reached prefire levels 18 years later, 30 years after the frigid Calcic Argixerolls derived from wind-blown loess, fire. Wambolt and others (2001) compared 13 prescribed residuum, or alluvium on slopes ranging from 0 to 12% burn areas with adjacent unburned areas in southwestern (Natural Resources Conservation Service 1995). Cli- Montana. Sagebrush recovery was irregular with some mate is semiarid with cold winters and warm summers. areas reestablishing readily, while others had very little Annual precipitation for the last 69 years averaged 325 sagebrush cover 15 years after fire. Herbaceous response mm (Anonymous 1999). At a rain gauge less than 2 km was highly variable despite the removal of the competing from the study, precipitation was 253 mm in the 12 shrub layer. In all of the above research, plant diversity months preceding the fire and was 213 mm in the 12 before or after the fire was not measured. months following the fire. Biodiversity as a measure of ecosystem condition has The research site is contained within a long-term been readily adopted by the public (Redford and Sand- sheep grazing study area (65 ha). The study area was erson 1992). This concern for biodiversity has resulted established in 1924 to measure the effects of grazing in various types of legislation, such as the National seasonality by comparing spring and fall grazing to fall Forest Management Act of 1976 (NFMA) and the Sur- only grazing (Pechanec and Stewart 1949). Stocking face Mining Control and Reclamation Act of 1977 (SM- rates and timing of grazing varied early in the study, CRA). Biodiversity has often focused on species num- and ungrazed control pastures were not added until bers because it is easy to measure and explain, but there 1941 and 1950. For the last 50 years the fall-grazed plots are more useful ways to describe and measure biodiver- have received 150 sheep days ha of use and the spring- sity (West 1993). Among ecologists, biodiversity is often grazed plots have been stocked with 100 sheep days ha expressed as the number of species in a community and (Bork and others 1998). On 31 July 2000, a 490-ha the relative abundances of these species (Peet 1974). Sev- wildfire burned through a portion of the US Sheep eral diversity indices have been developed for character- Experiment Station, including a portion of the long- izing plant communities, but all have limitations due to term grazing study (Figure 1). The ungrazed control incorrect assumptions and the confounding of commu- plots and most of a spring-grazed and a fall-grazed plot nity structure variables (Ludwig and Reynolds 1988). As were burned. To sample plant diversity and vegetation rangeland management decisions will continue to be recovery, 12 modified Whittaker plots (Stohlgren and based on improving ecosystems and increasing biodiver- others 1998), four in each grazing treatment, were sity, it is important to determine if changes in plant diver- established in the spring of 2001 (Figure 1). Placement sity can be adequately measured in the sagebrush steppe. of plots was random in areas that had a similar soil type With a hypothesis that prefire vegetation and the (Stohlgren and others 1999) and did not contain rock resultant seed banks would influence regeneration af- outcrops or unburned vegetation. Our reasons for the ter fire (West and Hassan 1985), we believed the wild- exclusions of rock and unburned areas were that rock fire would provide us with an excellent opportunity to outcrops contain a different vegetation component and measure plant diversity in the sagebrush steppe and to occupy small areas of the site, and unburned areas were determine the consequences of previous grazing prac- not the focus of this study. The modified Whittaker plot tices on post-fire plant diversity.
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