气候变化领域集成服务门户(CCPortal): Effect of simulated emerald ash borer infestation on nitrogen cycling in black ash (Fraxinus nigra) wetlands in northern Minnesota, USA

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DOI	10.1016/j.foreco.2019.117769
	Effect of simulated emerald ash borer infestation on nitrogen cycling in black ash (Fraxinus nigra) wetlands in northern Minnesota, USA
	Toczydlowski A.J.Z.; Slesak R.A.; Kolka R.K.; Venterea R.T.; D'Amato A.W.; Palik B.J.
发表日期	2020
ISSN	0378-1127
卷号	458
英文摘要	Black ash (Fraxinus nigra) wetlands are an important economic, cultural, and ecological resource in the northern Great Lake States, USA, and are threatened by the invasive insect, emerald ash borer (Agrilus planipennis Fairmmaire [EAB]). EAB-induced ash mortality can increase air temperatures, alter understory vegetation communities, and modify wetland hydrology by elevating the water table following canopy dieback, which may, in turn, alter nitrogen cycling in wetland soils and affect plant N uptake, N export to watersheds, and N emissions to the atmosphere. We sampled soils in replicated 1.6-ha plots six years after the following treatments were applied: girdling all ash greater than six cm diameter to simulate EAB-induced mortality, clearcutting with removal of all trees, and an unharvested control. In situ samples were collected from soil cores and from adjacent bulk areas influenced by vegetation to measure the concentration and rates of accumulation of inorganic nitrogen over the 2017 growing season. In the soil cores, the greatest nitrogen accumulation occurred in the unharvested control treatment and nitrate/nitrite were the dominant species of inorganic N. In contrast, in bulk soils, the clearcut treatment had greater overall nitrogen mineralization than both the control and girdle treatments, and ammonium had a greater relative abundance than nitrite/nitrate. Potential N mineralization (assessed with a lab incubation) was not affected by treatment, indicating that treatment effects observed in the field were likely due to changes in the microenvironment. Overall, the effect of simulated EAB on net nitrogen mineralization rates was minimal as mineralization was greatly constrained by ecosystem conditions compared to suitable, laboratory conditions, under which potential N mineralization was an order of magnitude greater than measured in the field. However, canopy treatment influenced water table levels, soil temperature, and vegetation communities, all of which influenced the relative abundance of inorganic N species. Our findings indicate limited indirect effects of EAB on net N mineralization in black ash wetlands. © 2019 Elsevier B.V.
关键词	Forestry Groundwater Hydrology Mineralogy Nitrogen Soils Vegetation Water treatment Wetlands Ecological resources Field lab comparison Forested wetlands Laboratory conditions Nitrogen accumulation Nitrogen mineralization Understory vegetation Vegetation community Soil pollution air temperature ammonium clearcutting emerald inorganic nitrogen mineralization nitrogen cycle relative abundance removal experiment stem borer water table watershed Forestry Hydrology Nitrogen Plants Water Treatment Wetlands Minnesota United States Agrilus planipennis Fraxinus nigra Hexapoda
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133088
推荐引用方式 GB/T 7714	Toczydlowski A.J.Z.,Slesak R.A.,Kolka R.K.,et al. Effect of simulated emerald ash borer infestation on nitrogen cycling in black ash (Fraxinus nigra) wetlands in northern Minnesota, USA[J]. Forest Ecology and Management,2020,458.
APA	Toczydlowski A.J.Z.,Slesak R.A.,Kolka R.K.,Venterea R.T.,D'Amato A.W.,&Palik B.J..(2020).Effect of simulated emerald ash borer infestation on nitrogen cycling in black ash (Fraxinus nigra) wetlands in northern Minnesota, USA.,458.
MLA	Toczydlowski A.J.Z.,et al."Effect of simulated emerald ash borer infestation on nitrogen cycling in black ash (Fraxinus nigra) wetlands in northern Minnesota, USA".458(2020).