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首页> 外文期刊>Marine ecology >Anthropogenic impacts on nitrogen fixation rates between restored and natural Mediterranean salt marshes
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Anthropogenic impacts on nitrogen fixation rates between restored and natural Mediterranean salt marshes

机译：人为因素对恢复的和天然的地中海盐沼之间固氮率的影响

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摘要

To test the effects of site and successional stage on nitrogen fixation rates in salt marshes of the Venice Lagoon, Italy, acetylene reduction assays were performed with Salicornia veneta- and Spartina townsendii-vegetated sediments from three restored (6–14years) and two natural marshes. Average nitrogen fixation (acetylene reduction) rates ranged from 31 to 343μmolC2H4·m−2·h−1 among all marshes, with the greatest average rates being from one natural marsh (Tezze Fonde). These high rates are up to six times greater than those reported from Southern California Spartina marshes of similar Mediterranean climate, but substantially lower than those found in moister climates of the Atlantic US coast. Nitrogen fixation rates did not consistently vary between natural and restored marshes within a site (Fossei Est, Tezze Fonde, Cenesa) but were negatively related to assayed plant biomass within the acetylene reduction samples collected among all marshes. Highest nitrogen fixation rates were found at Tezze Fonde, the location closest to the city of Venice, in both natural and restored marshes, suggesting possible site-specific impacts of anthropogenic stress on marsh succession.
机译：为了测试站点和演替阶段对意大利威尼斯泻湖盐沼中固氮率的影响，对来自三个恢复期（6-14年）和两个自然沼地的Salicornia veneta和Spartina townsendii植被沉积物进行了乙炔还原测定。在所有沼泽中，平均固氮（乙炔还原）速率范围为31至343μmolC2H4·m-2·h-1，其中最大的平均速率来自一种天然沼泽（Tezze Fonde）。这些高比率比类似地中海气候的南加州斯巴蒂纳沼泽报道的高六倍，但远低于美国大西洋沿岸潮湿气候中发现的高比率。某个地点（Fossei Est，Tezze Fonde，Cenesa）内的自然沼泽和恢复的沼泽之间的固氮率并不一致，但与所有沼泽中收集的乙炔还原样品中测定的植物生物量负相关。在自然和恢复的沼泽地中，最靠近威尼斯市的特兹峰丰德发现固氮率最高，这表明人为胁迫对沼泽演替的特定场所影响。

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