نتایج جستجو برای: soil chemistry

تعداد نتایج: 287163  

ژورنال: علوم آب و خاک 2002
رضا خراسانی, , غلامحسین حق نیا, ,

The presence of large amounts of calcium in the equilibrium system of calcareous soils of arid and semi-arid regions affects the chemical reactions of soluble and exchangeable phases. Exchange phenomenon is one of these chemical reactions in which calcium plays an important role. K-Ca equilibria are important equilibria in calcareous soils and may be an answer to many problems in soil chemistry...

This is the second of series on the impact of dust. It focuses on the physical, chemical and physiological effects of dust particles and aerosols. Plants of all types and classes (from algae to forest trees and everything in between) are adversely affected either directly through abrasion by airborne particles or through interference with plant physiology or indirectly through the impact on soi...

ژورنال: علوم آب و خاک 2009
رمضانپور, حسن, فرقانی, سعید, محبوب شارمی, سعید,

Surface charge of soils is measured using two different approaches: ion adsorption and potentiometric titration. Most models of surface charge chemistry of soils have been derived from the data obtained by potentiometric titration. The Uehara and Gillmanُs model was used to estimate the surface charges at some soil pH range in three forest soils of Lahidjan region. The selected soils (Typic Udor...

Journal: :Journal of environmental sciences 2010
Juanli Yun Anzhou Ma Yaoming Li Guoqiang Zhuang Yanfen Wang Hongxun Zhang

Zoige wetland is one of the most important methane emission centers in China. The oxidation of methane in the wetland affects global warming, soil ecology and atmospheric chemistry. Despite their global significance, microorganisms that consume methane in Zoige wetland remain poorly characterized. In this study, we investigated methanotrophs diversity in soil samples from both anaerobic site an...

2015
Randy Kolka Scott D. Bridgham Chien-Lu Ping

Peatlands are a subset of wetlands that have accumulated significant amounts of soil organic matter. Soils of peatlands are colloquially known as peat, with mucks referring to peats that are decomposed to the point that the original plant remains are altered beyond recognition (Chapter 6, SSSA 2008). Generally, soils with a surface organic layer >40 cm thick have been classified as Histosols in...

1999
W. Martin Luther

Technology Description: The ENSR Biovault Treatment Process is an ex-situ bioremediation technology for the treatment of organic contaminated soils. Contaminated soils placed in specially designed soil piles, referred to as biovaults, are remediated by stimulating the indigenous soil microbes to proliferate and metabolize the organic contaminants in the soil at an accelerated rate. Depending on...

2009
ZHAO MING ZHAO QINGLING TIAN DONG QIAN PING ZHANG XIAOSHUAN

With the development and popularization of Internet, The research focuses on how to get the requirement quickly and exactly from a large number of information. Using ontology provides a new intelligent searching method based on Web. In this paper, According to ontology theory of agriculture's characters and combining with the major of soil and agricultural chemistry, the retrieval system took t...

Journal: :Environmental pollution 2011
Carly J Stevens Cecilia Duprè Edu Dorland Cassandre Gaudnik David J G Gowing Albert Bleeker Martin Diekmann Didier Alard Roland Bobbink David Fowler Emmanuel Corcket J Owen Mountford Vigdis Vandvik Per Arild Aarrestad Serge Muller Nancy B Dise

A survey of 153 acid grasslands from the Atlantic biogeographic region of Europe indicates that chronic nitrogen deposition is changing plant species composition and soil and plant-tissue chemistry. Across the deposition gradient (2-44 kg N ha(-1) yr(-1)) grass richness as a proportion of total species richness increased whereas forb richness decreased. Soil C:N ratio increased, but soil extrac...

2009
ZHANG XIAOSHUAN ZHAO QINGLING TIAN DONG ZHAO MING

With the development and popularization of Internet, The research focuses on how to get the requirement quickly and exactly from a large number of information. Using ontology provides a new intelligent searching method based on Web. In this paper, According to ontology theory of agriculture's characters and combining with the major of soil and agricultural chemistry, the retrieval system took t...

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