نتایج جستجو برای: soil parameters

تعداد نتایج: 747097  

1985
K. Seki

Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Papers published in Hydrology and Earth System Sciences Discussions are under open-access review for the journal Hydrology and Earth System Sciences Abstract Introduction Conclusions References Tables Figures ◭ ◮ ◭ ◮ Back Close Full Screen / Esc Abstract The soil hydraulic parameters for analyzing soil water...

2016
Silvia Pajares Ana E. Escalante Ana M. Noguez Felipe García-Oliva Celeste Martínez-Piedragil Silke S. Cram Luis Enrique Eguiarte Valeria Souza

Arid ecosystems are characterized by high spatial heterogeneity, and the variation among vegetation patches is a clear example. Soil biotic and abiotic factors associated with these patches have also been well documented as highly heterogeneous in space. Given the low vegetation cover and little precipitation in arid ecosystems, soil microorganisms are the main drivers of nutrient cycling. None...

2000
Y. Pons

In clayey, swelling and more or less sodic soils, cultivation and seasonal climatic cycles induce variations in soil moisture which in turn cause variations in the soil structure. In particular, when the soil profile is saturated, some soils become impermeable because the soil porosity value does not remain sufficiently high throughout the drainage period to be effective for water movement. In ...

Journal: :مرتع و آبخیزداری 0
روح الله تقی زاده مهرجردی استادیار دانشکدة کشاورزی و منابع طبیعی دانشگاه اردکان فریدون سرمدیان استاد گروه مهندسی علوم خاک، دانشکده مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران غلامرضا ثواقبی استاد گروه مهندسی علوم خاک، دانشکده مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران محمود امید استاد گروه مهندسی ماشین¬آلات کشاورزی، دانشکده مهندسی و فناوری کشاورزی، پردیس کشاورزی و منابع طبیعی، دانشگاه تهران نورایر تومانیان استادیار پژوهشی، مرکز تحقیقات کشاورزی و منابع طبیعی اصفهان محمد جواد روستا عضو هیئت علمی مرکز ملی تحقیقات شوری محمدحسن رحیمیان

in recent years, alternative methods have been used for estimation of soil salinity. therefore, at present research, 600 soil samples collected from ardakan in central iran. then em38 and terrain parameters such as wetness index, land index and curvature as readily measured properties and soil salinity (0-30 and 0-100) as predicted variables were measured. after that, the data set was divided i...

H. Shakib and M. SadrNeshin,

In this study, the effective parameters on the inelastic response of asymmetric buildings is evaluated for an ensemble of real Iranian earthquake records by considering soil-structure interaction. Then, the design eccentricity obtained from the inelastic dynamic soil-structure analysis is compared with the design eccentricity of seisimic codes of Iran, ATC-3, New Zeland, Canada, Mexico, Austral...

Journal: :آب و خاک 0
حجت امامی امیر لکزیان مهدی مهاجرپور

abstract different definitions have been proposed for soil quality. various soil properties have been suggetsted as soil quality indices by researchers. this research was conducted to study the relationship between slope of retention curve at its inflection point (s index) and other soil physical quality indices, because the reserches between s index and soil physical properties are little. thi...

2016
Jarmo Mäkelä Jouni Susiluoto Tiina Markkanen Mika Aurela Heikki Järvinen Ivan Mammarella Stefan Hagemann Tuula Aalto

We examined parameter optimization in JSBACH ecosystem model, applied for two boreal forest sites (Hyytiälä and Sodankylä) in Finland. We identified and tested key parameters in soil hydrology and forest water and carbon exchange related formulations and optimized them using the Adaptive Metropolis algorithm (AM) for Hyytiälä with a five year calibration period (2000–2004) followed by a four ye...

2003
Guo-Yue Niu Zong-Liang Yang

Three different schemes of topography-based runoff production [versatile integrator of surface atmospheric processes (VISA)-TOP1, VISA-TOP2, and VISA-TOP3] are described for a land-surface model (LSM) developed for use with a general circulation model (GCM). The schemes’ sensitivities to some key parameters are assessed for two catchments using data sets developed for the Project for Intercompa...

2004
S. M. RÍOS N. S. NUDELMAN O. KATUSICH

The distribution coefficient of oil residuals between water and the soil under equilibrium conditions is, in the case of Patagonian soils, strongly dependent on the clay contents and humidity of the soil. Other variables such as, the soil salinity and the environmental exposure conditions, also affect the interactions between the phases. The oil residuals are generally accompanied by water spil...

2009
M. J. Escorihuela A. Chanzy

a r t i c l e i n f o The aim of this study is to analyze the influence of the soil moisture sampling depth in the parameterization of soil emission in microwave radiometry at L-band. The analysis is based on brightness temperature, soil moisture and temperature measurements acquired over a bare soil during the SMOSREX experiment. A more detailed profile of surface soil moisture was obtained wi...

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