نتایج جستجو برای: top soil

تعداد نتایج: 304166  

ژورنال: علوم آب و خاک 2009
ادهمی, ابراهیم, باقرنژاد, مجید, مولوی, رویا,

Fire is widely used to clear farms in Iran, while there is little information regarding the effects of fire on the characteristics, especially mineralogy of soils. The objectives of the present study were to 1) compare some physico-chemical properties of burned and unburned soils and 2) evaluate minerals transformation in top soil layer resulting from increasing temperature. Soil samples were t...

2013
Binayak P. Mohanty

A review of recent developments related to soil hydraulic property estimation using remote sensing is presented. Several soil hydraulic parameter estimation techniques using proximal-, air-, or satellite-based remotely sensed soil moisture, land surface temperature, and/ or evapotranspiration time series have evolved over the past decades. In particular, microwave remote sensing of near-surface...

2015
Xiumin Yan Zhen Ni Liang Chang Kehong Wang Donghui Wu Marc A. Rosen

The effect of soil warming and precipitation control in the context of soil warming on Collembola community was studied in Songnen grassland, China. Treatments included (1) control; (2) soil warming; (3) soil warming with low precipitation; and (4) soil warming with high precipitation. The open top chambers were used to increase the soil temperature, and the low and high precipitation were crea...

Journal: :Journal of environmental quality 2007
Joon Ki Yoon Xinde Cao Lena Q Ma

Phosphate rock (PR) and phosphoric acid (PA) are an effective combination of P sources for immobilizing Pb in contaminated soils. This column experiment examined the effectiveness of different application methods on Pb immobilization in a contaminated soil. Phosphate was applied at a P/Pb molar ratio of 4 with half as PR and half PA. While PR was mixed with the soil or placed as a layer, aqueou...

2015
Xuan Yu Xu Liu Zhong Zhao Jinliang Liu Shunxiang Zhang

This study aims to evaluate the effect of different afforestation models on soil microbial composition in the Loess Plateau in China. In particular, we determined soil physicochemical properties, enzyme activities, and microbial community structures in the top 0 cm to 10 cm soil underneath a pure Hippophae rhamnoides (SS) stand and three mixed stands, namely, H. rhamnoides and Robinia pseucdoac...

Ayesha S Ali, Iram Khan, Sharique A. Ali,

Introduction: Among soil species earthworms are ubiquitous, abundant and important for soil processes, constituting the largest terrestrial faunal biomass and are also impacted by soil pollutants. The primary purpose of this study was to determine whether changes in earthworm biomass and behavior could serve as a good indicator for copper toxicity in soil systems. Another aim of the study was t...

Journal: :Journal of environmental management 2009
Dirk Goossens Brenda Buck

Soil analyses and measurements with the Portable In Situ Wind Erosion Laboratory (PI-SWERL) were conducted on 16 soil types in an area heavily affected by off-road vehicle (ORV) driving. Measurements were performed in ORV trails as well as on undisturbed terrain to investigate how ORV driving affects the vulnerability of a soil to emit PM10 (particles<10microm), during the driving as well as du...

2000
B. J. Radford B. J. Bridge R. J. Davis D. McGarry U. P. Pillai J. F. Rickman P. A. Walsh D. F. Yule

Soil compaction has been recognised as the greatest problem in terms of damage to Australia's soil resource. Compaction by tractor and harvester tyres, related to traf®cking of wet soil, is one source of the problem. In this paper an array of soil properties was measured before and immediately after the application of a known compaction force to a wet Vertisol. A local grain harvester was used ...

2013
David A. N. Ussiri Rattan Lal

Reclaimed mined soils (RMSs) could restore soil quality and ecosystem productivity while sequestering C and off-setting some of C emissions associated with coal utilization. The study was conducted to evaluate the effects of tillage and pasture management on soil physical properties, soil organic carbon (SOC) and microbial biomass carbon (MBC) in RMSs managed for agricultural use in eastern Ohi...

2010
Elsy A. Escobar Paul Dahlen Paul C. Johnson

The diffusive transport of volatile organic compounds (VOCs) in the subsurface at petroleum spill sites can significantly affect vapor migration from sources to buildings and ground surface. Thus, knowledge of compound-specific vapor transport and bio-attenuation is of great interests to those who must identify risks and make corrective action decisions for petroleum spill sites. In this work, ...

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