نتایج جستجو برای: 100 cm depths physical

تعداد نتایج: 1181848  

Journal: :Journal of environmental quality 2004
Peter J A Kleinman Andrew N Sharpley Tamie L Veith Rory O Maguire Peter A Vadas

Evaluation of phosphorus (P) management strategies to protect water quality has largely relied on research using simulated rainfall to generate runoff from either field plots or shallow boxes packed with soil. Runoff from unmanured, grassed field plots (1 m wide x 2 m long, 3-8% slope) and bare soil boxes (0.2 m wide and 1 m long, 3% slope) was compared using rainfall simulation (75 mm h(-1)) s...

2013
Jixin Cao Xiaoping Wang Xiangyang Sun Lin Zhang Yun Tian

Grazing can cause changes in soil carbon (C) level. This study aimed to elucidate the response of soil labile organic carbon (SLOC) under four different grazing intensities: non grazing (NG), 0 sheep·ha(-1); light grazing (LG), 0.91 sheep·ha(-1); moderate grazing (MG), 1.82 sheep·ha(-1), and heavy grazing (HG), 2.73 sheep·ha(-1). Results showed that there was no significant difference in total ...

fatemeh zakerhosseini, Kazem Hemmadi

In arid and semi-arid regions, soil surface warming is a considerable phenomenon causing a high thermal gradient which makes water flow intensely. The degree of soil temperature is effective on crop production, plant growth and soil microorganisms. In recent years, the ascending trend of temperature has been substantially noticed by researchers in the issues of pointwise climate change and at w...

Journal: :Frontiers in Environmental Science 2022

Forests ecosystem plays a significant role in supplying multiple services given the unique properties of forest soils, which elements C, N, and P are essential to support soil fertility site productivity. However, at different depths between plantation forests (PF) natural (NF) have not been well quantified. Therefore, current study was carried out Qilian Mountains northwest China determine dif...

Journal: :Frontiers in Ecology and Evolution 2023

Under the combined effects of topography and vegetation, hydrological connectivity characteristics riverbank slopes become complex unclear, which limit utilization protection riparian zones. To quantify in root–soil composites, we conducted dyeing tracing experiments a high elevation plot low on bank Fenhe River. Soil root properties indexes plots were measured analyzed. The results showed that...

Journal: :Journal of nematology 2003
S Pen-Mouratov M Rakhimbaev Y Steinberger

Seasonal and spatial variation in soil nematode communities was investigated in a field study conducted on a loessial plain in the northern Negev Desert, Israel. Soil samples from 0- to 50-cm depths were collected seasonally during 2001 under the canopy of Atriplex halimus and Hammada scoparia, and between shrubs (control). Total population abundance ranged from 8 to 887 individuals per 100 g s...

Rangelands cover approximately 85% of Kenya’s land mass and is a major resource for livestock farming with a considerable potential to mitigate climate change, yet these lands are stressed differently by various management. Our study aimed at determining the influence of grazing management systems (rotational, continuous and ungrazed) on soil organic carbon stocks in Yoani ranch located in the ...

Journal: :Injury prevention : journal of the International Society for Child and Adolescent Injury Prevention 2004
A H Gunatilaka S Sherker J Ozanne-Smith

OBJECTIVE A recent case series study found that only 4.7% of 402 playgrounds in which arm fractures occurred in Victorian schools complied with the recommended 20 cm depth of tanbark. Tanbark depths at fall sites varied between 0-27 cm and the mean was 11.1 (5.0) cm. The purposes of the present study were to (1) measure impact attenuation properties of shallow and compacted depths of tanbark; (...

ژورنال: علوم آب و خاک 2015
افیونی, مجید , حاج عباسی, محمدعلی, چاوشی, الهام ,

The sorption and desorption of fluoride by soil can play an important role in the transport of fluoride in soil. The study was conducted on the soil from Isfahan University of Technology research station site (two depths of 0-30 and 30- 60 cm). Fluoride sorption reactions were examined by equilibrating 0, 2.5, 5, 10, 25, 50 and 100 mg L-1 NaF solution with soils for 23 hr. The desorption experi...

ژورنال: علوم آب و خاک 2001
افیونی, مجید , مصدقی, محمدرضا ,

Tillage system effect, Conventional (CT) vs. No-Till (NT), on soil physical properties and Br transport was studied at two locations in North Carolina. The soil types were a Typic Paleudults at Coastal Plain (site 1) and a Typic Kanhapludults at Piedmont (site 2). Bulk density (BD), total porosity (TP), macroporosity (MP), and saturated hydraulic conductivity (Ks) .were measured in plant row (R...

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