نتایج جستجو برای: 10 cm soil depth greater than 10

تعداد نتایج: 3075502  

The study was aimed to assess of the Danish and Swiss methods of thinning in 20 years old plantations of Chestnut leaved Oak (Quercus castaneifolia C. A. Mey.) in terms of quantitative and qualitative characteristics of trees, natural regeneration, plant and soil invertebrate diversity. The study area is located in Neka forests, east of Mazandaran province in the Caspian region. This research w...

2001
J. Holden T. P. Burt N. J. Cox

Little is known about the processes of infiltration and water movement in the upper layers of blanket peat. A tension infiltrometer was used to measure hydraulic conductivity in a blanket peat in the North Pennines, England. Measurements were taken from the surface down to 20 cm in depth for peat under four different vegetation covers. It was found that macropore flow is a significant pathway f...

Journal: رستنیها 2014

During 2012–13, the presence of ascomycetous species in soil was studied in Kermanshah province (W Iran). In each location, samples were collected from 0–30 cm depth and passed through 2 mm, 40 and 60 mesh sieves. Using soil plating method, 10 g of soil samples were placed in 90 ml of 0.1% water-agar containing 100 ppm NPX, mixed and serially diluted to 10-2 to 10-5 and 1 ml of each solution fl...

2007
Stewart B. Wuest

Reduced tillage methods for field crop production result in less disruption of soil structure and often increased amounts of crop residue maintained on the soil surface. The combination of these two factors produces increased surface soil aggregation. This study was conducted in the field and within pots to determine whether surface residue by itself improves soil aggregation within a short per...

2003
Raija Laiho Timo Penttilä Jukka Laine

The within-site variability of soil characteristics on sites with different soil types remains poorly quantified, although this information is crucial for the success of research on soil properties, and especially for monitoring soil properties over time. We used coefficients of variation and multilevel variance component models to examine the within-site variation of soil (0–30 cm) mineral nut...

2013
Julien Fortier Benoit Truax Daniel Gagnon France Lambert

The objectives of this study were to compare coarse root (diameter > 2 mm) and fine root (diameter < 2 mm) biomass, as well as distribution of soil carbon stocks in 3 types of riparian land uses across 4 sites located in farmland of southern Québec, Canada: (1) hybrid poplar buffers (9th growing season); (2) herbaceous buffers; (3) natural woodlots (varying in tree species and age). For all lan...

Journal: :Arhiv za higijenu rada i toksikologiju 2013
Gordana Medunić Iva Juranović Cindrić Ivanka Lovrenčić Mikelić Nenad Tomašić Dražen Balen Višnja Oreščanin Štefica Kampić Ivana Ivković

The aim of this study was to establish the fractionation of copper and zinc in a small apple orchard using the revised (four-step) Bureau Communautaire de Référence (BCR) sequential extraction procedure and assess their potential mobility in soil. Soil samples were collected at the depth of 10 cm to 25 cm, sixteen from the orchard and five control samples from a meadow located some 200 m away f...

1999
D. M. Amatya R. W. Skaggs J. H. Hughes

Orifice-weir structures are being used to reduce peak drainage rates and to store water during the growing season in poorly drained pine plantations. Earlier studies have demonstrated their effectiveness in reducing drainage outflows while conserving water during the growing season. This study reports on criteria and preliminary guidelines for designing such structures. The guidelines were deve...

2015
Maximiliano Lopez Silva Horacio Sanguinetti Jorge Aguilar Adolfo Alvarez Alberó Norberto Bernardo

A 67-year-old male presented with left kidney stones in renal pelvis, 15 mm length. Preoperative CT showed massive splenomegaly. Retrograde intrarenal surgery approach was decided to avoid splenic injury, achieving the absence of residual stones.

Journal: :Journal of environmental quality 2009
P Emerson J Skousen P Ziemkiewicz

Surface mining in West Virginia removes the eastern deciduous forest and reclaiming the mined land to a productive forest must consider soil depth, soil physical and chemical properties, soil compaction, ground cover competition, and tree species selection. Our objective was to evaluate tree survival and growth in weathered brown sandstone and in unweathered gray sandstone. Brown and gray sands...

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