Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering
Online ISSN : 1884-7242
Print ISSN : 1882-2789
Research Papers
Consideration of Snow Cover and Snowmelt upon the Inorganic Nitrogen Leaching Characteristics of an Apple Orchard in a Gray Lowland Soil
Akira ENDODaiyu ITOKoh KATOChihiro KATOChoichi SASAKI
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2017 Volume 85 Issue 2 Pages I_221-I_231

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Abstract

The authors estimated spatiotemporal dynamics of inorganic nitrogen concentration of pore water in Apple orchard of Gray lowland soil in Tsugaru region, Aomori prefecture by numerical analysis with FEM solver, taking snow cover and snowmelt into account. Under non-consideration condition of snow cover and snowmelt, it was indicated that the traveling velocity (Δzt) of the NO3-N concentration peak reached to a depth of 100 cm (Δzt = 20-26 cm/month) in about 4 months from late November to the early March of the following year. On the other hand, considering snow cover and snowmelt, it was indicated that the high concentration of NO3-N reached to the depth of 100 cm (Δzt = 100-130 cm/month) in just one month from early March to early April. Consequently, from the perspective of promoting environmental conservation and reducing the environmental load, the importance of soil moisture transfer during winter season was quantified by numerical analysis. Thus, it was necessary to discuss the behavior of NO3-N in soil pore water and the nitrogen budget, taking into consideration the snowmelt water from the soil surface in early spring.

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© 2017 The Japanese Society of Irrigation, Drainage and Rural Engineering
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