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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream-Downstream Continuum
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Anthropogenic Phosphorus Inputs to a River Basin and Their Impacts on Phosphorus Fluxes Along Its Upstream-Downstream Continuum

机译：对河流域的人为磷投入及其对上游的下游连续内的磷通量的影响

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摘要

The increasing trend in riverine phosphorus (P) loads resulting from anthropogenic inputs has gained wide attention because of the well-known role of P in eutrophication. So far, however, there is still limited scientific understanding of anthropogenic P inputs and their impacts on riverine flux in river reaches along the upstream-to-downstream continuum. Here we investigated P budgets in a series of nested watersheds draining into Hongze Lake of China and developed an empirical function to describe the relationship between anthropogenic inputs and riverine P fluxes. Our results indicated that there are obvious gradients regarding P budgets in response to changes in human activities. Fertilizer application and food and feed P import was always the dominant source of P inputs in all sections, followed by nonfood P. Further interpretation using the model revealed the processes of P loading to the lake. About 2%-9% of anthropogenic P inputs are transported from the various sections into the corresponding tributaries of the river systems, depending upon local precipitation rates. Of this amount, around 41%-95% is delivered to the main stem of the Huai River after in-stream attenuation in its tributaries. Ultimately, 55%-86% of the P loads delivered to different locations of the main stem are transported into the receiving lake of the downstream, due to additional losses in the main stem. An integrated P management strategy that considers the gradients of P loss along the upstream-to-downstream continuum is required to assess and optimize P management to protect the region's freshwater resource.
机译：在河流磷（P）负载从人为投入导致的增加的趋势已经深入人心，因为P在富营养化的知名角色的广泛关注。迄今为止，然而，有仍然是有限的人为P输入科学认识及其对河流通量河段沿着上游至下游的连续体的影响。在这里，我们调查了P预算在一系列嵌套流域排入中国的洪泽湖和开发经验函数来描述人为投入和沿江P通量之间的关系。我们的研究结果表明，有关于应对人类活动变化p预算明显的梯度。施肥与食品和饲料进口P总是在所有片段P的投入，其次是使用模型非食品P.进一步诠释的主要来源透露P负荷的过程湖。约2％-9人为P输入％是从各部分输送到水系的支流对应根据当地的降水率。这一数额中，约41％-95％的插播衰减及其支流后输送到淮河的主干。最终，55％-86递送至主茎的不同位置的P加载的％被输送到下游的接收湖泊，由于主茎附加损耗。一种考虑沿着上游至下游的连续磷流失的梯度一个集成的P管理的策略需要评估和优化P管理以保护该地区的淡水资源。

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