Hydrological Controls on Nutrient Exportation from Old-Growth Evergreen Rainforests and Eucalyptus nitens Plantation in Headwater Catchments at Southern Chile

现代水文学期刊(英文) Pub Date : 2015-03-27 DOI:10.4236/OJMH.2015.52003

C. Oyarzún, P. Hervé-Fernández, D. Huygens, P. Boeckx, N. Verhoest

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引用次数: 4

Abstract

Soil cover disturbances have a direct effect on biogeochemistry, potentially enhancing nutrient loss, land degradation and associated changes in ecosystem services and livelihood support. The objective of this study was to assess how canopy affected throughfall chemistry and how hydrology affected stream nutrient load responses in two watersheds dominated by native old-growth evergreen rainforest (NF) and exotic plantation of Eucalyptus nitens (EP), located at the Coastal mountain range of southern Chile (40˚S). We measured nitrogen (NO3-N, NH4-N, Organic-N, Total-N) and total phosphorus (Total-P) at catchment discharge, and δ18O in throughfall precipitation and stream discharge in both catchments, in order to separate throughfall (or new water) contributions during storm events. It was hypothesized that all nutrients showed an increase in concentration as discharge increased (or enhanced hydrological access), in EP; but not in NF. Our results indicated that Organic-N, Total-N and Total-P concentrations were positively related to discharge. However, 3 NO − -N showed a negative correlation with catchment discharge. Organic-N and Total-P

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智利南部水源集水区原始常绿雨林和桉树人工林养分输出的水文控制

土壤覆盖扰动对生物地球化学有直接影响，可能加剧养分流失、土地退化以及生态系统服务和生计支持方面的相关变化。在智利南部沿海山脉(40˚S)以原生老常绿雨林(NF)和外来桉树人工林(EP)为主的两个流域，研究了林冠对径流化学的影响以及水文对河流养分负荷响应的影响。我们测量了集水区排放的氮(NO3-N、NH4-N、有机氮、总氮)和总磷(total - p)，以及两个集水区通过降水和河流排放的δ18O，以便分离风暴事件中通过降水(或新水)的贡献。假设在EP中，所有营养物质的浓度都随着排放量的增加(或水文通道的增加)而增加;但NF中没有。结果表明，有机氮、全氮和全磷浓度与排放量呈正相关。3 NO−-N与流域流量呈负相关。有机氮和全磷

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现代水文学期刊(英文)

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