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Challenges of Brush Management Treatment Effectiveness in Southern Great Plains, United States
Rangeland Ecology & Management ( IF 2.3 ) Pub Date : 2021-04-21 , DOI: 10.1016/j.rama.2021.03.007
Rheinhardt Scholtz , Samuel D. Fuhlendorf , Daniel R. Uden , Brady W. Allred , Matthew O. Jones , David E. Naugle , Dirac Twidwell

Woodland expansion is a global challenge documented under varying degrees of disturbance, climate, and land ownership patterns. In North American rangelands, mechanical and chemical brush management practices and prescribed fire are frequently promoted by agencies and used by private landowners to reduce woody plant cover. We assess the distribution of agency-supported cost sharing of brush management (2000−2017) in the southern Great Plains, United States, and evaluate the longevity of treatment application. We test the general expectation that the current brush management paradigm in the southern Great Plains reduces woody plants and conserves rangeland resources at broad scales. This study represents the most comprehensive assessment of treatment longevity following brush management in the southern Great Plains by linking confidential private lands management data to a national inventory program (US Department of Agriculture Natural Resources Conservation Service National Resources Inventory). We observed regional differences in the types of brush management techniques used in cost-sharing programs throughout the study area. Mechanical brush management was the most common practice cost shared in Texas, while a mixture of mechanical and chemical application was most common in Oklahoma. Prescribed fire was most common in Kansas with some areas receiving chemical treatment. Our analysis showed brush management, as implemented, did not reduce tree cover long term and minimally reduced shrub cover. Evidence to support the current brush management paradigm only existed at local site-level scales of analysis (40- to 50-acre area), but treatment effectiveness was short-lived. At regional scales, observed changes in woody plant cover showed little to no overall net reduction from 2000 to 2017. These findings bring into question the philosophy of the current brush management paradigm, its implementation as the default rangeland conservation practice, and its prioritization over alternative practices that prevent new woody plant establishment and enhance resilience of rangelands in the southern Great Plains region.



中文翻译:

美国南部大平原的刷管理治疗有效性面临的挑战

林地扩张是在不同程度的干扰,气候和土地所有权模式下记录的一项全球挑战。在北美牧场中,机构经常推广机械和化学刷管理做法以及规定的火势,并由私人土地所有者用来减少木本植物的覆盖率。我们评估了美国大平原南部地区政府支持的刷牙管理费用分摊的分布情况(2000-2017年),并评估了治疗应用的寿命。我们测试了人们的普遍期望,即大平原南部当前的灌木管理范式减少了木本植物,并大范围地保护了牧场资源。这项研究通过将机密私有土地管理数据与国家清单计划(美国农业部自然资源保护局国家资源清单)相关联,代表了大平原南部刷子管理后对治疗寿命的最全面评估。我们在整个研究区域的分摊费用计划中使用的画笔管理技术类型上观察到了地区差异。机械刷管理是得克萨斯州最常见的做法成本,而机械和化学方法的混合使用在俄克拉荷马州最常见。在堪萨斯州,规定的火灾最为普遍,有些地区接受化学处理。我们的分析表明,实施刷子管理后,长期而言并不会减少树木的覆盖率,并且灌木覆盖率的降低也很少。仅在本地站点级别的分析规模(40至50英亩面积)上存在支持当前画笔管理范式的证据,但治疗效果很短。在区域范围内,观察到的木本植物覆盖变化在2000年至2017年期间几乎没有或没有整体净减少。这些发现使人们对当前的灌木管理范式的哲学,其作为默认牧场保护实践的实施以及相对于替代方法的优先级提出质疑。防止在大平原地区南部建立新的木本植物并增强牧场恢复力的做法。

更新日期:2021-04-21
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