Humic substances of soils and general theory of humification by D. S. Orlov Download PDF EPUB FB2
A probable structure of humic acids - the most important component of humus - has been proposed and the general theory of humification discussed. Recommendations have been made for forecasting change of the humus state of soils in the course of their agricultural exploitation and for improving the humus state of cultivated by: Book Description This work contains results of the latest studies on the composition, structure and properties of humic substances, which are the largest and most important component of organic matter of different types of soils.
It should be useful for soil. The text of this English language version of the author's book 'Humic acids of soils and general theory of humification' has been significantly revised. Results of the latest studies on the composition, structure and properties of humic substances are summarized.
The group and fractional composition of the humus of the main soil types of Russia and other countries are by: Humic substances of soils and general theory of humification Orlov, Dmitriĭ Sergeevich This work contains results of the latest studies on the composition, structure and properties of humic substances, which are the largest and most important component of organic matter of different types of soils.
Presenting the best and most recent research in this important area, this book focuses on the molecular and chemical aspects of humic substances, with sophisticated analytical, chemical and 4/5(1).
The book then presents concepts of humic matter, referred to as humic acid, covering a range of ideas from traditional views of biopolymers to the latest concepts based on micellar, supramolecular, and nanotube chemistry.
The author presents the major pathways of humification. A search of the literature reveals that this model is identical to several similar conceptualizations proposed about 15 years ago, and that it corresponds closely with the description of humic substances given in Waksman's () remarkably thorough book on the topic, which also emphasized the intimate connections existing between humic substances and soil microorganisms.
Humic substances, a family of closely related compounds, are considered to be a major product of this process. In recent years, several articles have questioned the role and even existence of soil humic substances as a distinct entity in soil organic matter. Humic substances (HS) are complex and heterogeneous mixtures of polydispersed materials formed in soils, sediments, and natural waters by biochemical and chemical reactions during the decay and transformation of plant and microbial remains (a process called humification).
Humic substances are the other, unidentifiable components, which are formed by the microbial degradation of dead plant matter (humification process) and are very resistant to further biodegradation. Humic substances in soils and sediments can be divided into three main fractions: humin, humic acids and fulvic acids.
The field of humic matter research has undergone drastic changes in concepts and principles since the first edition of Humic Matter in Soil and the Environment: Principles and Controversies was published more than a decade ago.
Still the only book of its kind specifically addressing humic acid principles and controversies, the Second Edition presents the newest advances in humic acid : Kim H. Tan. Humic Substances of Soils and General Theory of Humification 1st Edition by D.S.
Orlov and Publisher CRC Press. Save up to 80% by choosing the eTextbook option for ISBN:The print version of this textbook is ISBN: Humus composition and the structural characteristics of humic substances in soils under different land uses in Leyte, Philippines.
Ian A. NAVARRETE. The HAs were still in the early stage of humification as indicated by the Type Rp in most soils, the higher contents of elemental H and N, and the high H/C and O/C ratios. This listing is a new book, a title currently in-print which we order directly and immediately from the publisher.
Humic Substances of Soils and General Theory of Humification. A [+] RICHIEDI UN'IMMAGINE. Libreria: Herb Tandree Philosophy Books (Regno Unito) Anno pubblicazione: ;Released on: The only book to completely define and explore the genesis, extraction, properties, and impact of humic matter on agriculture, industry, and the environment, Humic Matter in Soil and the Environment delves into the issues and controversies associated with produced and natural humic compounds.
It assesses the role of humic substances in medicines, f. Humic substances in soils and sediments can be divided into three main fractions: humic acids, fulvic acids, and humin. Their presence and relative abundance is inferred by lab extraction, a process which alters their original form beyond recognition.
Abstract Humic acids (HAs) make up to 30–50% of the soil organic matter, which is the main reservoir of organic carbon in the biosphere.
The common isolation protocol for HAs implies alkaline extraction from soils followed by acidification of the extract with HCl to pH 2.
A fundamental set biogeochemical nature of the humification process, the effects of the thermodynamics and kinetics directing the synthesis and degradation of humic substances (HS), the variability of the properties of SOM and humic substances.
The term "humification" in Russian literature has a double meaning: firstly, it is the accumulation of organic matter in the soil, and secondly, - the content of organic matter in the soil. Usually. on humification processes in fire-affected soils. Knicker, A.
Hilscher MOL () Long-term effects of wildfires on soil organic matter features: a study in Mediterranean shrublands of Eastern Spain. Rovira, B. Duguy MOL () Comparison of humic substances in burnt and unburned forest soils in central Portugal.
Humification is considered to be a global process that is implemented in soils and organic sediments and also in natural water and air. The term “suspended soils” has become increasingly common in recent years. Suspended soils are defined as the part of the organic matter that has not undergone the full decomposition process and has not turned into the humus of terrestrial soils.
The very complex structure of humic and fulvic acid makes it difficult to obtain a spectral signature for all soils in general. The humic acids of different soils have been observed to have. The traditional view of decomposition and “humification” of organic residues in soils included a loss of proteinaceous and carbohydrate materials and an accumulation of “humic” materials containing a high proportion of aromatic carbon (Haider et al., ).
Humification is a process of formation of humic substances (organic matter that has reached maturity) decomposed from plant remains. Humification results from progressive oxidation by addition of oxygen from oxygenated water and lowering of the groundwater table, pH values of the water in the peat, and heat exposure or peat temperature.
Humic substances are the most widespread organic compounds, naturally occurring from the physical, chemical, and microbiological transformation of plant and animal residues.
They are heterogeneous and complex carbon macromolecules, which can be found in soil, water, and geological organic deposits. Humic substances represent about 25% of total organic carbon on Earth and comprise up to 75% of. Humic substances (HS) are compounds with a complicated structure, present in the humus soil layer, water, lake sediments, peat, brown coal and shales.
Due to their similar physicochemical properties to DNA, they may have an adverse effect on the subsequent use of the isolated material.
Membrane-Micelle Model for Humus in Soils and Sediments and Its Relation to Humification By ROBERT L. WERSHAW U.S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER The accumulation of humic substances in soil (the so called “humification”) is, therefore, a dynamic process, by which the heterogeneous byproducts of abiotic and biotic degradation of animal and plant tissues (lipids, peptides, oligosaccharides, etc.), are no longer covalently linked in implausible branched humic macropolymers of ever growing molecular masses.
More editions of Humic Substances of Soils and General Theory of Humification (Russian Translations Series): Humic Substances of Soils and General Theory of Humification (Russian Translations Series): ISBN () Hardcover, CRC Press, Downloadable.
Soil is one of the principal substrates of human life and can serve as a reservoir of water and nutrients. Humic substances, indicators of soil fertility, are dominant in soil organic matter.
However, soil degradation has been occurring all over the world, usually by soil salinization. Sustainable soil productivity has become an urgent problem to be solved. Several pathways exist for the formation of humic substances during the decay of plantand animal remains in soil, •Classical theory, popularized by Waksman, is that humic substances represent modified lignins (pathway 1) but the majority of present-day investigators favor a mechanism involving quinones (pathway 2 and 3).Humic substances (HSs) are the natural organic polyelectrolytes formed from the biochemical weathering of plant and animal remains.
Their macromolecular structure and chemistry determine their role in biogeochemical processes. In situ spectromicroscopic evidence showed that the HS macromolecular structures (size and shape) vary as a function of HS origin (soil versus fluvial).
Humic substances (HS) are an operationally defined fraction of soil organic matter, and they represent the largest pool of recalcitrant organic carbon in the terrestrial environment.
It has traditionally been thought that extractable HS consist of novel categories of cross-linked macromolecular structures. In this study, advanced nuclear magnetic resonance approaches were used to study the.