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• W2749318049 abstract "Abstract Streams and rivers can be highly reactive sites for nitrogen (N) transformation and removal. Empirical and model‐based research show how location in a stream network affects rates of N removal. Because the structure of stream networks can vary widely and N cycling in headwater streams may affect N cycling in downstream reaches, we hypothesised that network structure may affect whole stream network processing of N. We generated three stream networks with the same catchment area but differing shapes, based on optimal channel network theory. We applied a model of nitrate ( ) transport and denitrification, and implemented model scenarios to examine how network shape affects removal with (1) increased loading from the catchment, (2) altered spatial distributions of loading and (3) decreased drainage density (i.e. loss of headwater streams). For all stream networks, the fraction of total removed decreased with increasing loading from the catchment. Stream networks in narrow catchments removed a higher fraction of , particularly at intermediate loading rates. Network shape also controlled the distribution of removal in small versus large streams, with larger streams removing a higher fraction of the total load in narrower networks. The effects of network shape on removal when the spatial distribution of loading was altered varied with the magnitude of loading. At low loads, was entirely removed when added to distal parts of the stream network, and about 50% removed when added near the outlet; there was no effect of network shape. At intermediate and high loads, the fraction of total load removed by the narrow stream network was 1.5× higher than the rectangular and square networks when was added to distal parts of the networks. Network shape did not have an effect when load occurred near the outlet, regardless of the magnitude of the load. The fraction of total removed by the stream network was up to 5% lower when drainage density was reduced from 1.0 to 0.74 km −1 , with the least change for the narrow network. Reducing the drainage density also altered the role of small relative to large streams, with the net effect of moving the location of removal downstream. Overall, effects of network shape contributed up to 20% of the variation in the fraction of removed by stream networks. Network shape was most important at intermediate to high loads and when was loaded to distal parts of the catchment. The narrow network removed more across model scenarios, with elevated removal in larger streams explaining most of the difference. We suggest the shape of the catchment may modulate the degree to which large streams contribute to whole network removal." @default.
• W2749318049 created "2017-08-31" @default.
• W2749318049 creator A5067941959 @default.
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• W2749318049 date "2017-08-22" @default.
• W2749318049 modified "2023-09-30" @default.
• W2749318049 title "How network structure can affect nitrogen removal by streams" @default.
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• W2749318049 doi "https://doi.org/10.1111/fwb.12990" @default.
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