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首页> 外文期刊>Journal of the American Water Resources Association >NITROGEN SUBSIDIES FROM HILLSLOPE ALDER STANDS TO STREAMSIDE WETLANDS AND HEADWATER STREAMS, KENAI PENINSULA, ALASKA
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NITROGEN SUBSIDIES FROM HILLSLOPE ALDER STANDS TO STREAMSIDE WETLANDS AND HEADWATER STREAMS, KENAI PENINSULA, ALASKA

机译：阿拉斯加基奈半岛从丘陵斜坡到陆缘湿地和源流的氮沉降

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摘要

We examined nitrogen transport and wetland primary production along hydrologic flow paths that link nitrogen-fixing alder (Alnus spp.) stands to downslope wetlands and streams in the Kenai Lowlands, Alaska. We expected that nitrate concentrations in surface water and groundwater would be higher on flow paths below alder. We further expected that nitrate concentrations would be higher in surface water and groundwater at the base of short flow paths with alder and that streamside wetlands at the base of alder-near flow paths would be less nitrogen limited than wetlands at the base of long flow paths with alder. Our results showed that groundwater nitrate-N concentrations were significantly higher at alder-near sites than at no-alder sites, but did not differ significantly between alder-far sites and no-alder sites or between alder-far sites and alder-near sites. A survey of N-15 stable isotope signatures in soils and foliage in alder-near and no-alder flow paths indicated the alder-derived nitrogen evident in soils below alder is quickly integrated downslope. Additionally, there was a significant difference in the relative increase in plant biomass after nitrogen fertilization, with the greatest increase occurring in the no-alder sites. This study demonstrates that streamside wetlands and streams are connected to the surrounding landscapes through hydrologic flow paths, and flow paths with alder stands are potential "hot spots" for nitrogen subsidies at the hillslope scale.
机译：我们研究了沿着固氮al木（Alnus spp。）站与阿拉斯加基奈低地的下坡湿地和溪流相连的水文流动路径的氮运输和湿地初级生产。我们预计在al木以下的流动路径中，地表水和地下水中的硝酸盐浓度会更高。我们进一步预计，在短流路径的底部，随着al木的存在，地表水和地下水中的硝酸盐浓度会更高，而al木近流路径的底部的河边湿地的氮含量将比长流路径的底部受到的湿地的氮更少。与al木。我们的结果表明，al木附近的地下水中硝酸盐-N的浓度显着高于无-草地，但al木之间和no木之间或or木和and木之间的地下水氮含量无明显差异。 。对al木近和无-流路中土壤和树叶中N-15稳定同位素特征的一项调查表明，al木下土壤中明显来自evident木的氮是快速整合的下坡。此外，氮肥施肥后植物生物量的相对增加存在显着差异，其中最大的增加发生在无-地。这项研究表明，溪流湿地和溪流通过水文流动路径与周围景观相连，而带有der木林的流动路径是山坡尺度上氮补贴的潜在“热点”。

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