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首页> 外文期刊>Rangeland Ecology & Management >Vegetation Response to Juniper Reduction and Grazing Exclusion in Sagebrush-Steppe Habitat in Eastern Oregon
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Vegetation Response to Juniper Reduction and Grazing Exclusion in Sagebrush-Steppe Habitat in Eastern Oregon

机译：在俄勒冈州东部的山丘 - 草原栖息地的杜松减少和放牧排斥植被反应

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Western juniper expansion is one of the largest threats to conserving sagebrush steppe ecosystems in the northwestern United States. Juniper expansion has degraded the sagebrush steppe by altering fire regimes and outcompeting shrubs and herbaceous vegetation for limited resources. We characterized the effect of juniper removal in a severely degraded sagebrush steppe habitat for 3 yr following juniper cutting. In addition, we measured the effect of low-intensity seasonal grazing on plant community recovery through cattle exclusion treatments. We monitored plant community composition (exotic annual grasses, preferred grasses, preferred forbs, and shrubs); fuel loads; and juniper recruitment in a factorial design of juniper removal and grazing exclusion. We found that although there were significant differences between cut and uncut juniper treatments, there were no consistent trends across all 3 yr. Our results suggest that other factors, such as timing of precipitation, may also have strong short-term effects on plant community composition. We detected no significant grazing effects during the study period, suggesting the current grazing regime is appropriate for the area. The cutting of juniper increased total fuel loads and herbaceous fuel loads. Compared with open interspace, a twofold increase in juniper seedlings and saplings was detected beneath juniper piles, which will act as sources for future juniper encroachment. (C) 2017 The Society for Range Management. Published by Elsevier Inc. All rights reserved.
机译：西部瞻博网络扩张是在美国西北部保护Sagebrush Steppe生态系统的最大威胁之一。通过改变防火制度和露出的灌木和草本植物，杜松巨爪膨胀已经降低了Sagebrush Steppe，以获得有限的资源。我们在杜松切割之后，在严重降级的Sagebrush Stepitat中表征了杜松移除的效果3 YR。此外，我们测量了低强度季节性放牧对通过牛排除治疗的植物群落回收的影响。我们监测植物群落组成（异国情调的年度草，首选草，首选牙豆和灌木）;燃料载荷;和瞻博网络招募在杜松移除和放牧排斥的局势设计中。我们发现，虽然剪切和未切割的瞻博网络之间存在显着差异，但所有3年都没有一致的趋势。我们的研究结果表明，其他因素，如降水的时间，也可能对植物群落组成具有很强的短期影响。我们在研究期间没有检测到显着的放牧效果，表明目前的放牧制度适合该地区。切割杜松增加总燃料载荷和草本燃料载荷。与开放式间隙相比，在杜松桩下面检测到杜松幼苗和树苗的两倍增加，这将作为未来杜松侵占的来源。 （c）2017年范围管理协会。由elsevier Inc.保留所有权利发布。

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