Mining of Deep Nitrogen Facilitates Phragmites australis Invasion in Coastal Saltmarshes
Mining of Deep Nitrogen Facilitates Phragmites australis Invasion in Coastal Saltmarshes
复制标题
深氮开采促进芦苇入侵沿海盐沼
DOI:
10.1007/s12237-022-01146-x
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发表时间:
2023
影响因子:
2.7
通讯作者:
Megonigal, J. Patrick
中科院分区:
文献类型:
--
作者:
Mozdzer, Thomas J.;Meschter, Justin;Baldwin, Andrew H.;Caplan, Joshua S.;Megonigal, J. Patrick
Phragmites australis(or common reed), one of the most widespread invasive species in wetlands of North America, has a high nitrogen (N) demand compared to native species. However, it is unclear howP. australisis able to meet this N demand, especially in systems with low soil N and limited N inputs. We evaluated whether deep rooting could be a mechanism by whichP. australisaccesses otherwise unused N pools, allowing it to circumvent nutrient competition and acquire the “missing N” needed to meet its N demand. We examined above and belowground N pools, as well as depth profiles of belowground biomass (to 3 m), in native andP. australis-dominated plant communities in two brackish marshes of the Chesapeake Bay. To evaluate whether deep roots contribute toP. australismeeting its high N demand, we amended soil porewater with15N at four soil depths (10, 20, 40, and 80 cm) and measured the rate of15N assimilation into plant biomass. We found thatP. australishad 6–8 × the aboveground standing stock N, 2–3 × the total belowground biomass, and roots up to 3 × deeper than native plant communities (some exceeding 3 m). Our15N tracer study demonstrated thatP. australisacquired N from all measured soil depths, whereas N uptake by native plants was minimal below 20 cm. Our results demonstrate that deep rooting is a mechanism by whichP. australiscan access previously buried N pools, helping to satisfy its high N demand and thus fuel its invasion. Moreover, these results fundamentally challenge our understanding of biogeochemical processes deep within the soil profile given the presence of active roots at depths where they were previously thought to be largely inert.
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DOI:
10.1007/bf02823716
发表时间:
2003-04-01
期刊:
ESTUARIES
影响因子:
--
作者:
Chambers, RM;Osgood, DT;Montalto, F
通讯作者:
Montalto, F
影响因子:
4.9
作者:
C. Saunders;J. Megonigal;J. Reynolds
通讯作者:
J. Reynolds
DOI:
--
发表时间:
1973
期刊:
影响因子:
--
作者:
I. Valiela;J. Teal;Warren J. Sass
通讯作者:
Warren J. Sass
DOI:
--
发表时间:
2018
期刊:
影响因子:
--
作者:
Thomas J. Mozdzer;J. Caplan
通讯作者:
J. Caplan
影响因子:
1.8
作者:
Armstrong, J;Armstrong, W;Sinclair, A
通讯作者:
Sinclair, A