IMPACT OF AN INVASIVE EXOTIC SPECIES ON STREAM NITROGEN LEVELS IN SOUTHERN ILLINOIS

Christine L. Goldstein; Karl W.J. Williard; Jon E. Schoonover

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IMPACT OF AN INVASIVE EXOTIC SPECIES ON STREAM NITROGEN LEVELS IN SOUTHERN ILLINOIS

机译：外来入侵物种对伊利诺斯州南部流态氮水平的影响

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Autumn-olive (Elaeagnus umbellata Thunb.) is an invasive, exotic shrub that has become naturalized in the eastern United States. Autumn-olive fixes nitrogen (N) via a symbiotic relationship with the actino-mycete Frankia. At the plot scale, the presence of autumn-olive has been related to elevated soil water nitrate-N (NO_3~--N) concentrations. This study examined the relationship between autumn-olive cover in a watershed and stream water quality. Stream water nitrate-N (NO_3~--N) and ammonium-N (NH_4~+-N) concentrations were measured in 12 first order ephemeral streams draining watersheds with mixed forest cover and a range of 0-35% autumn-olive cover. Percent autumn-olive cover was positively correlated with mean stream NO_3~--N concentrations, but was not correlated with mean stream NH_4~+-N concentrations. While other studies have demonstrated a significant relationship between native N-fixers and stream NO_3~--N, this is the first study to document a relationship for an invasive, exotic N-fixing species. Results suggest that this exotic species can be an additional source of NO_3~- in local and regional water bodies and demonstrates an additional negative ecosystem consequence of invasion beyond losses in biodiversity.

机译：秋色橄榄（Elaeagnus umbellata Thunb。）是一种侵入性的奇异灌木丛，已在美国东部归化。秋季橄榄通过与放线菌-真菌类Frankia的共生关系固定氮（N）。在样地尺度上，秋橄榄的存在与土壤水硝酸盐氮（NO_3〜--N）浓度升高有关。这项研究研究了流域秋季橄榄覆盖与溪流水质之间的关系。在12个一阶临时河中，测量流域硝酸盐氮（NO_3〜--N）和铵态氮（NH_4〜+ -N）的浓度，这些小河排水的分水岭带混合的森林覆盖率和0-35％的秋季橄榄覆盖率。秋季橄榄覆盖率与平均水流NO_3-〜N浓度呈正相关，但与平均水流NH_4〜+ -N浓度不相关。虽然其他研究已经证明了天然N固定剂与NO_3〜--N流之间存在显着的关系，但这是第一个证明与入侵的外来N固定物种之间的关系的研究。结果表明，该外来物种可能是局部和区域水体中NO_3〜-的额外来源，并显示了生物多样性丧失以外的入侵所带来的其他负面生态系统后果。

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《Journal of the American Water Resources Association》 |2009年第3期|664-672|共9页
作者
Christine L. Goldstein; Karl W.J. Williard; Jon E. Schoonover;
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作者单位

Department of Forestry, Southern Illinois University Carbondale, 1205 Lincoln Drive, MC 4411, Carbondale, Illinois 62901;

Department of Forestry, Southern Illinois University Carbondale, 1205 Lincoln Drive, MC 4411, Carbondale, Illinois 62901;

Department of Forestry, Southern Illinois University Carbondale, 1205 Lincoln Drive, MC 4411, Carbondale, Illinois 62901;

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正文语种 eng
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关键词
biogeochemistry; forests; invasive species; nitrate; nitrogen fixation; nonpoint source pollution; nutrients; watersheds;

机译：生物地球化学森林;入侵物种;硝酸盐固氮面源污染;营养素分水岭;

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IMPACT OF AN INVASIVE EXOTIC SPECIES ON STREAM NITROGEN LEVELS IN SOUTHERN ILLINOIS

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