USDA-Agricultural Research Service, Eastern Oregon Agricultural Research Center (EOARC), 67826-A Hwy 205, Burns, OR 97720, USA.
Environ Manage. 2012 Sep;50(3):441-50. doi: 10.1007/s00267-012-9894-6. Epub 2012 Jul 7.
The ecological integrity of the Wyoming big sagebrush (Artemisia tridentata Nutt. ssp. wyomingensis Beetle and A. Young) alliance is being severely interrupted by post-fire invasion of non-native annual grasses. To curtail this invasion, successful post-fire revegetation of perennial grasses is required. Environmental factors impacting post-fire restoration success vary across space within the Wyoming big sagebrush alliance; however, most restorative management practices are applied uniformly. Our objectives were to define probability of revegetation success over space using relevant soil-related environmental factors, use this information to model cost of successful revegetation and compare the importance of vegetation competition and soil factors to revegetation success. We studied a burned Wyoming big sagebrush landscape in southeast Oregon that was reseeded with perennial grasses. We collected soil and vegetation data at plots spaced at 30 m intervals along a 1.5 km transect in the first two years post-burn. Plots were classified as successful (>5 seedlings/m(2)) or unsuccessful based on density of seeded species. Using logistic regression we found that abundance of competing vegetation correctly predicted revegetation success on 51 % of plots, and soil-related variables correctly predicted revegetation performance on 82.4 % of plots. Revegetation estimates varied from $167.06 to $43,033.94/ha across the 1.5 km transect based on probability of success, but were more homogenous at larger scales. Our experimental protocol provides managers with a technique to identify important environmental drivers of restoration success and this process will be of value for spatially allocating logistical and capital expenditures in a variable restoration environment.
怀俄明州大叶蒿（Artemisia tridentata Nutt. ssp. wyomingensis Beetle 和 A. Young）联盟的生态完整性正受到火灾后入侵的非本地一年生草本植物的严重干扰。为了遏制这种入侵，需要成功地对多年生草本植物进行火灾后重新造林。影响怀俄明州大叶蒿联盟内火灾后恢复成功的环境因素在空间上有所不同；然而，大多数恢复管理实践都是统一应用的。我们的目标是使用相关的土壤相关环境因素来定义空间上的重新造林成功率的概率，利用这些信息来模拟成功重新造林的成本，并比较植被竞争和土壤因素对重新造林成功的重要性。我们研究了俄勒冈州东南部一个燃烧过的怀俄明州大叶蒿景观，该景观用多年生草种重新播种。我们在燃烧后的头两年，沿着 1.5 公里长的样带每隔 30 米收集一次土壤和植被数据。根据播种物种的密度，将样方分为成功（>5 株/平方米）和不成功。使用逻辑回归，我们发现，竞争植被的丰度正确预测了 51%的样方的重新造林成功率，而土壤相关变量正确预测了 82.4%的样方的重新造林表现。根据成功率，1.5 公里长的样带内的重新造林估计值从每公顷 167.06 美元到 43,033.94 美元不等，但在较大的尺度上更为均匀。我们的实验方案为管理人员提供了一种识别恢复成功的重要环境驱动因素的技术，这一过程将有助于在可变的恢复环境中对物流和资本支出进行空间分配。
