نتایج جستجو برای: soil and air resources

تعداد نتایج: 16925634  

2005
Alfred E. Hartemink Henk de Bakker

Although people have always classified soils, it is only since themid 19th century that soil classification emerged as an important topic within soil science. It forced soil scientists to think systematically about soils and its genesis and developed to facilitate communication between soil scientists. It has also been the cause for much debate and confusion but two internationally accepted sys...

ژورنال: علوم آب و خاک 2018

In this study, the values of moisture and soil temperature were estimated at different depths and times under unsteady conditions by solving the Richards’ equation in an explicit finite difference method provided in Visual Studio C#. For the estimation of soil hydraulic parameters, including av and nv (coefficients of van Genuchten’s equation) and Ks (saturated hydraulic conductivit...

2014
Alexander Kokhanovsky

We live in an era of environmental deterioration through depletion and degradation of resources such as air, water, and soil; the destruction of ecosystems and the extinction of wildlife (Kondratyev, 1998; Kondratyev et al., 2004; Cracknell et al., 2009; Hansen et al., 2013; Freedman, 2014). As a matter of fact, environmental degradation is one of three main threats identified in 2004 by the Hi...

Journal: :آب و خاک 0
حسین شهاب آرخازلو حجت امامی غلامحسین حق نیا علیرضا کریمی

abstract soil quality is an essential concept for maximum agriculture production without environmental destruction. studying soil physical quality indicators, that express soil structural stability and soil air-water balance in root zone, is one of the most important aspects of soil quality. so determination of optimal range for pore volume distribution is important and this research carried ou...

2014
Mohammad Mehdi Amin Mohammad Sadegh Hatamipour Fariborz Momenbeik Heshmatollah Nourmoradi Marzieh Farhadkhani Fazel Mohammadi-Moghadam

The integration of bioventing (BV) and soil vapor extraction (SVE) appears to be an effective combination method for soil decontamination. This paper serves two main purposes: it evaluates the effects of soil water content (SWC) and air flow rate on SVE and it investigates the transition regime between BV and SVE for toluene removal from sandy soils. 96 hours after air injection, more than 97% ...

Journal: Desert 2016
A. Gandomkar M. Bagheri Bodaghabadi S. Amini

      There are various methods and models for land evaluation. These methods are classified according to the number of used resources. The best resources capabilities or potentials and land use can be found by analyzing one of the main resources, in the lands close relations to ecologic resources exist. Soil has a great potential for introducing the studied region specifications. Hence, it cha...

2014
Gunnar Jungqvist Stephen K. Oni Claudia Teutschbein Martyn N. Futter

Complex non-linear relationships exist between air and soil temperature responses to climate change. Despite its influence on hydrological and biogeochemical processes, soil temperature has received less attention in climate impact studies. Here we present and apply an empirical soil temperature model to four forest sites along a climatic gradient of Sweden. Future air and soil temperature were...

Journal: :Tree physiology 1997
P A Schwarz T J Fahey T E Dawson

Net photosynthesis and stomatal conductance were measured in ten red spruce (Picea rubens Sarg.) saplings, growing near Ithaca, New York, throughout the early spring and late-fall growing periods. Gas exchange and daily minimum and maximum soil and air temperatures were also measured. Linear regression analysis showed that rates of net photosynthesis were positively correlated with both minimum...

2015
Shou-Qin Sun Hui-Ying Cai Scott X. Chang Jagtar S. Bhatti

Effects of sample storage methods on the quantity and quality of labile soil organic carbon are not fully understood even though their effects on basic soil properties have been extensively studied. We studied the effects of air-drying and frozen storage on cold and hot water soluble organic carbon (WSOC). Cold- and hot-WSOC in air-dried and frozen-stored soils were linearly correlated with tho...

Journal: :Plant biology 2013
N Contran M S Günthardt-Goerg T M Kuster R Cerana P Crosti E Paoletti

The drought- and thermo-tolerant Quercus pubescens, a tree species growing on both acidic and calcareous soils in the sub-Mediterranean region, was exposed to soil drought (-60% to -80% soil water content) and air warming (+1.2 °C daytime temperature), singly and in combination. The experiment was conducted on two natural forest soils with similar texture but different pH (acidic and calcareous...

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