Water Potential in Conditions of Soil Solution Phase Change and During the Year

The dynamics of the soil water potential and soil temperature at different depths during the year was studied. As the object of the investigation we took soddy-podzolic clay loamy weakly gleyed soils of Zelenogradskiy base of Soil Science Institute. The data of soil water and temperature were derived from the automated meteorologic station “VantagePro2”. In conditions of the sustainable state of the other components of the environment, we discovered sharp spasmodic increase of the soil water potential at the passing of temperature values to the range below zero, i.e., in conditions of the phase overpass of the soil solution. All of the types of soil water potential changes (slow and rapid, significant and insignificant) occur due to the changes (decrease or increase) of the water content and soil temperature. For the first time in our country the thermohydrophysical phenomenon of (thermodynamic process) of sharp (at 5-6 times) and rapid (practically immediate) increase of the water potential after the overpass of the temperature over zero from the area of positive values to the negative values is discovered and described. The knowledge of specificities of the dynamics of soil water potential due to the temperature will allow us to plan the terms and norms of watering.

атмосферные осадки, суммарное испарение, потенциал влаги, температура почвы, влагообмен, зона аэрации, наименьшая влагоемкость, диффузия влаги, precipitation, evapotranspiration, water potential, soil temperature, water exchange, aeration zone, minimum moisture-holding capacity, water diffusion

1. Глобус А.М. Неизотермический внутрипочвенный влагоперенос. Автореф. дис. … докт. с.-х. н. Л., 1977. 48 с.

2. Корякин Н.В. Основы химической термодинамики. М.: Академия, 2003. 463 с.

3. Муромцев Н.А., Коваленко П.И., Семенов Н.А., Мажайский Ю.А., Яцык Н.В., Шуравилин А.В., Воропай Г.В., Анисимов К.Б., Коломиец С.С. Внутрипочвенный влагообмен, водопотребление и водообеспеченность многолетних культурных травостоев. Рязань, 2013. 300 с.

4. Муромцев Н.А., Семенов Н.А., Мажайский Ю.А., Анисимов К.Б. Закономерности накопления, потерь и возврата влаги и химических веществ при внутрипочвенном влагообмене // Бюл. Почв. ин-та им. В.В. Докучаева. 2014. № 76. С. 111-125.

5. Муромцев Н.А., Анисимов К.Б. Некоторые особенности формирования водного режима дерново-подзолистой почвы на различных элементах геоморфологической катены // Бюл. Почв. ин-та. 2014. № 77. С. 78-93.

6. Нерпин С.В., Чудновский А.Ф. Энергомассообмен в системе растение-почва-приземный воздух. Л.: Гидрометеоиздат, 1975. 358 с.

7. Руководство по монтажу и использованию автоматической метеостанции. Гавард, 2009. 63 с.

8. Durner W., Or. D. Soil Water Potential Measurement // Encyclopedia of Hydrological Sciences. 2006. Apr. P. 1-14.

9. Durner W., Jansen U., Iden S. C. Effective hydraulic properties of layered soils at the lysimeter scale determined by inverse modelling // European J. Soil Science. 2008. V. 59 (1). P. 114-124. doi: 10.1111/Дж.1365-2389.2007.00972.х

10. Nolz R., Cepuder P., Balas J., Loiskandl W. Soil water monitoring in a vineyard and assessment of unsaturated hydraulic parameters as thresholds for irrigation management // Agricultural Water Management. 2016. V. 164. Part 2. P. 235-242.