نتایج جستجو برای: soil dynamics

تعداد نتایج: 612820  

2014
H. Vereecken H. Bogena L. Weihermüller G. Martinez J. Vanderborght

In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: On the spatio-temporal dynamics of soil moisture at the field scale s u m m a r y In this paper, we review the state of the ...

2010
Salvatore Manfreda Todd M. Scanlon Kelly K. Caylor

The description of soil moisture dynamics is a challenging problem for the hydrological community, as it is governed by complex interactions between climate, soil and vegetation. Recent research has achieved significant advances in the description of temporal dynamics of soil water balance through the use of a stochastic differential equation proposed by Laio et al. (2001). The assumptions of t...

2006
R. K. Misra

An understanding of soil fragmentation during aggregate breakdown is useful in studies of erosion, tillage and traffic. Modelling efforts in soil fragmentation has largely focussed on characterisation of the size and mass distribution of aggregates using fractal approach and less on the nature and magnitude of the applied energy that produces fragmentation. In this paper, we report a model of s...

Journal: :Ecology 2006
Brandon T Bestelmeyer Judy P Ward Kris M Havstad

Soil properties are well known to affect vegetation, but the role of soil heterogeneity in the patterning of vegetation dynamics is poorly documented. We asked whether the location of an ecotone separating grass-dominated and sparsely vegetated areas reflected only historical variation in degradation or was related to variation in inherent soil properties. We then asked whether changes in the c...

Journal: :The American naturalist 2004
Amilcare Porporato Edoardo Daly Ignacio Rodriguez-Iturbe

Some essential features of the terrestrial hydrologic cycle and ecosystem response are singled out by confronting empirical observations of the soil water balance of different ecosystems with the results of a stochastic model of soil moisture dynamics. The simplified framework analytically describes how hydroclimatic variability (especially the frequency and amount of rainfall events) concurs w...

2018
Khairudin Nurulhuda Donald S Gaydon Qi Jing Mohamad P Zakaria Paul C Struik Karel J Keesman

Extensive modelling studies on nitrogen (N) dynamics in flooded soil systems have been published. Consequently, many N dynamics models are available for users to select from. With the current research trend, inclined towards multidisciplinary research, and with substantial progress in understanding of N dynamics in flooded soil systems, the objective of this paper is to provide an overview of t...

2014
Evgenia Blagodatskaya Sergey Blagodatsky Traute-Heidi Anderson Yakov Kuzyakov

Plant-microbial interactions alter C and N balance in the rhizosphere and affect the microbial carbon use efficiency (CUE)-the fundamental characteristic of microbial metabolism. Estimation of CUE in microbial hotspots with high dynamics of activity and changes of microbial physiological state from dormancy to activity is a challenge in soil microbiology. We analyzed respiratory activity, micro...

Journal: :Remote Sensing 2015
Khan Zaib Jadoon Lutz Weihermüller Matthew F. McCabe Davood Moghadas Harry Vereecken Sébastien Lambot

We tested an off-ground ground-penetrating radar (GPR) system at a fixed location over a bare agricultural field to monitor the soil freeze-thaw cycles over a snow-covered surface. The GPR system consisted of a monostatic horn antenna combined with a vector network analyzer, providing an ultra-wideband stepped-frequency continuous-wave radar. An antenna calibration experiment was performed to f...

2013
William Smith Daniel Melanz Carmine Senatore Karl Iagnemma Huei Peng

A simulation study was conducted to evaluate three terramechanics methods used for predicting single wheel performance of small vehicles on granular terrain. Traditional Bekker-type terramechanics methods do not consider the soil profile, the soil dynamics, or the transient wheel dynamics, which can be important factors in vehicle performance. The ‘dynamic Bekker’ method used to overcome these ...

2002
Q. Zhuang A. D. McGuire K. P. O’Neill J. W. Harden V. E. Romanovsky J. Yarie

[1] In this study, the dynamics of soil thermal, hydrologic, and ecosystem processes were coupled to project how the carbon budgets of boreal forests will respond to changes in atmospheric CO2, climate, and fire disturbance. The ability of the model to simulate gross primary production and ecosystem respiration was verified for a mature black spruce ecosystem in Canada, the age-dependent patter...

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