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Effects of western juniper (Juniperus occidentalis) control on ecosystem nitrogen stocks in central Oregon, USA
Journal of Plant Ecology ( IF 2.7 ) Pub Date : 2021-05-21 , DOI: 10.1093/jpe/rtab052
Mohamed A B Abdallah 1 , Ricardo Mata-González 1 , Jay S Noller 2 , Carlos G Ochoa 1
Affiliation  

Abstract
Aims
In the Oregon of USA, the control of western juniper (Juniperus occidentalis) is an accepted rangeland management practice to restore sagebrush steppe habitats of importance to wildlife and livestock. The effects of juniper cutting on ecosystem nitrogen, however, have not been well addressed although woody plant control has important implications for local watershed management and regional nitrogen pools.
Methods
We quantified ecosystem nitrogen stocks in two adjacent watersheds, comprised of a treated watershed (most juniper removed) and an untreated watershed (juniper not removed). Thirteen years after juniper removal, we measured aboveground nitrogen stocks for juniper trees, shrubs, grasses and litter in both watersheds. We also measured belowground nitrogen stocks (roots and soil) in both watersheds at two soil depths (0–25 and 25–50 cm).
Important Findings
Aboveground nitrogen stocks were 6.9 times greater in the untreated than in the treated watershed considering the much larger aboveground biomass. However, root nitrogen stocks were 3.1 times greater in the treated one due to the gain of understory root biomass associated with juniper cutting. Soil nitrogen stocks at both 0–25 and 25–50 cm depths were not affected by juniper removal. Overall, total ecosystem nitrogen stocks did not differ between the treated (9536 kg N ha−1) and untreated (9456 kg N ha−1) watersheds. The greatest ecosystem nitrogen accumulation (at least 95% total ecosystem nitrogen) resided belowground (soil 0–50 cm and roots) in both watersheds. This study provides evidence that the benefits of juniper removal can be attained without significantly affecting the capacity of ecosystem nitrogen storage.


中文翻译:

西部杜松 (Juniperus occidentalis) 控制对美国俄勒冈州中部生态系统氮储量的影响

摘要
目标
在美国俄勒冈州,控制西部杜松 ( Juniperus occidentalis ) 是一种公认​​的牧场管理实践,以恢复对野生动物和牲畜具有重要意义的山艾树草原栖息地。然而,杜松切割对生态系统氮的影响尚未得到很好的解决,尽管木本植物控制对当地流域管理和区域氮库具有重要意义。
方法
我们量化了两个相邻流域的生态系统氮储量,包括一个经过处理的流域(大部分杜松被移除)和一个未经处理的流域(杜松未被移除)。杜松移除 13 年后,我们测量了两个流域中杜松树、灌木、草和枯枝落叶的地上氮储量。我们还在两个土壤深度(0-25 和 25-50 cm)测量了两个流域的地下氮储量(根和土壤)。
重要发现
考虑到更大的地上生物量,未处理流域的地上氮储量是处理流域的 6.9 倍。然而,由于与杜松切割相关的林下根系生物量的增加,处理后的根系氮储量增加了 3.1 倍。0-25 厘米和 25-50 厘米深度的土壤氮储量不受杜松去除的影响。总体而言,经处理的(9536 kg N ha -1)和未经处理的(9456 kg N ha -1 )的生态系统总氮储量没有差异) 流域。最大的生态系统氮积累(至少 95% 的总生态系统氮)位于两个流域的地下(土壤 0-50 厘米和根部)。这项研究提供的证据表明,可以在不显着影响生态系统氮储存能力的情况下获得去除杜松的好处。
更新日期:2021-05-21
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