Nitrogen migration paths and source areas at different snowmelt periods in a seasonal freezing agricultural watershed

Zhao, Qiang; Guo, Chenyao; Zeng, Qiang; Zhao, Hang; Liu, Yawen; Zhang, Jifeng; Huang, Jiesheng; Wu, Jingwei

doi:10.1016/j.ejrh.2022.101083

Cited by 2 publications

(6 citation statements)

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“…The reason could be that the snowmelt water stayed longer on the GS treatments [38], and a smaller slope was not conducive to the production of the subsurface runoff when the soil was frozen. Therefore, more snowmelt water was lost through infiltration and evaporation, and less water was generated in the gentle slope treatments [5]. This can be verified by the changes in the soil water before and after the snowmelt, as shown in Table 5.…”

Section: Critical Factors Affecting Snowmelt Water Loss From Sloping ...mentioning

confidence: 62%

“…Nonpoint nitrogen losses from farmland play a vital role in the degeneration of soil and aquatic ecosystems [1][2][3]. Snowmelt is a key factor in driving nitrogen export from farmland in seasonal freezing agricultural watersheds [4,5]. Exploring the critical factors affecting water and nitrogen losses from farmland during the snowmelt process is of great value to the management of water resources and nitrogen application in these regions.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, these sloping farmlands more easily accumulate snow because of wind-drifting snow [29]. As a result, these areas always contribute most of the water and nitrogen export during the snowmelt process because of shorter access to the river and the easily occurring "flushing effect" [4,5]. Many studies have been carried out to study the factors affecting snowmelt-induced water and nitrogen export from sloping fields.…”

Section: Introductionmentioning

confidence: 99%

“…Hinckley et al [31] discovered that snowmelt events that occurred on south-facing slopes quickly transported soil nitrogen into aquatic systems compared with north-facing slopes. Zhao et al [5] conducted a watershed monitoring experiment in an agricultural watershed and found that nitrogen was mostly flushed into rivers by water from steeper areas (>6 • ) and lower slope areas (<2 • ) along the river, which consumed snowmelt water and nitrogen through depression and retention storage. However, these studies were mostly conducted at the watershed or hill scale, and the influencing factors were unmanageable [5,30,31].…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al [5] conducted a watershed monitoring experiment in an agricultural watershed and found that nitrogen was mostly flushed into rivers by water from steeper areas (>6 • ) and lower slope areas (<2 • ) along the river, which consumed snowmelt water and nitrogen through depression and retention storage. However, these studies were mostly conducted at the watershed or hill scale, and the influencing factors were unmanageable [5,30,31]. Thus, their conclusions were mostly gained from qualitative analysis, lacking quantitative and statistical results [31].…”

Section: Introductionmentioning

confidence: 99%

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Critical Factors Affecting Water and Nitrogen Losses from Sloping Farmland during the Snowmelt Process

Zhao

Zhang

et al. 2023

Agronomy

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Water and nitrogen losses from farmland during the snowmelt process play a vital role in water and nitrogen management in cold regions. To explore the mechanisms and factors contributing to water and nitrogen loss from different sloping farmlands during the snowmelt period, field experiments were conducted under two slope treatments (8° and 15°), two soil water content (SWC) treatments, and two snow water equivalent (SWE) (5 mm and 10 mm) treatments in a seasonal freezing agricultural watershed of Northeast China. The results showed that during the snowmelt process, SWE was the most important factor affecting water and nitrogen production through the surface and total runoff of the sloping farmland, followed by the slope. The water and nitrogen yield in the high snow (HS) treatments ranged from 1.76 to 8.15 and 1.65 to 12.62 times higher than those in the low snow (LS) treatments. The generation of nitrogen was advanced compared with that of water induced by the preferential production of nitrogen. A higher slope promoted this preferential production function of nitrogen. Enhanced infiltration combined with the preferential yield of nitrogen resulted in a greatly decreased yield of water and nitrogen in the gentle slope and LS (GS_LS) treatments. These findings are valuable for accurately describing the water and nitrogen cycling in seasonally freezing sloping farmland.

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Section: Critical Factors Affecting Snowmelt Water Loss From Sloping ...mentioning

confidence: 62%