Interaction between kaolinite and amino acid components of soil organic matter

1978 ◽  
Vol 141 (1) ◽  
pp. 3-10 ◽  
Author(s):  
A. Stefani ◽  
P. Sequi
Keyword(s):  
Organic Matter ◽  
Amino Acid ◽  
Soil Organic Matter

The effects of organic fertiliser, arginine, on the chemical composition of soil organic matter in a boreal forest

2021 ◽  
Author(s):  
Shun Hasegawa ◽  
Torgny Näsholm ◽  
Mark Bonner
Keyword(s):  
Organic Matter ◽  
Amino Acid ◽  
Chemical Composition ◽  
Soil Organic Matter ◽  
Boreal Forest ◽  
Ammonium Nitrate ◽  
Inorganic Nitrogen ◽  
Organic Fertiliser ◽  
Soil C ◽  
Inorganic Fertiliser

<p>There is a growing body of evidence that plants uptake a monumental amount of organic forms of nitrogen (N) like amino acids in addition to those in inorganic forms. An amino acid-based fertiliser has been shown to improve seedling development and commercialised. Boreal forests store a substantial amount of carbon (C) in the soil and this is widely known to be further enhanced by the addition of inorganic nitrogen fertiliser via hampered decomposition. However, very little is known about how amino acid-based fertiliser influences C/N cycling in the boreal soils. The organic forms of N supply not only nitrogen but also carbon. If the previously demonstrated suppression of SOM decomposition is owing to altered C:N ratios in substrates, the amino acid-based fertiliser may not have as pronounced effects on the soil as the inorganic fertiliser. </p><p> We have examined the impacts of the organic fertiliser (100 kg N and 130 kg C ha<sup>-1</sup> year<sup>-1</sup>)—arginine—on the chemical composition of soil organic matter in a boreal forest in comparison to non-fertilised, inorganic fertilised (ammonium-nitrate) and C-controlled inorganic fertilised (sucrose + ammonium-nitrate) conditions. The soil organic matter was characterised using two metrics: pyrolysis GC/MS and 13C solid-state nuclear magnetic resonance (NMR), combined with enzymological and metagenomic analysis.</p><p>We will be presenting the results following 4-year of the fertiliser treatments. Preliminary results have shown that there is limited evidence that the fertiliser treatments alter soil C/N cycing in four years. Nevertheless, the chemical composition in SOM under the organic fertiliser condition was similar to that under C-controlled compared to inorganic fertiliser treatment. </p>

ACTION OF PROTEOLYTIC ENZYMES ON SOIL ORGANIC MATTER

1970 ◽  
Vol 50 (2) ◽  
pp. 233-241 ◽  
Author(s):  
F. J. SOWDEN
Keyword(s):  
Amino Acids ◽  
Organic Matter ◽  
Amino Acid ◽  
Soil Organic Matter ◽  
Acid Hydrolysis ◽  
Leucine Aminopeptidase ◽  
Proteolytic Enzymes ◽  
Complexing Agent ◽  
Organic Matter Fractions ◽  
Hydrolysis Of

The amino acids set free by proteolytic enzymes were determined with an amino acid analyzer. Soil and enzyme blanks were subtracted. Pronase released 2 to 10% of the aspartic acid + asparagine, threonine, serine, glutamic acid + glutamine, glycine, lysine and histidine in some fractions of soil organic matter along with 15–35% of the alanine, valine, isoleucine, leucine, tyrosine, phenylalanine and arginine. There was no release of proline, ornithine or ammonia. When the pronase hydrolysate was treated with leucine amino-peptidase, 15% of the proline was released, the yield of glycine was raised from 2 to 14% and the amount of the acidic amino acids was also higher. Acid hydrolysis of the pronase hydrolysate also released more amino acid material but the blanks were much higher than with leucine aminopeptidase. The results suggested that more than half of the aspartic and glutamic acids found on acid hydrolysis were present in the soil organic matter fractions as asparagine and glutamine. The action of pronase on the organic matter of the intact soil was slight, even in the presence of a complexing agent. Papain released very little amino acid material from organic matter fractions, but leucine aminopeptidase or HCl hydrolysis of the papain hydrolysate released about 10% of the amino acid of the fraction, indicating that significant amounts of peptides were formed on papain treatment.

Amino acid composition of soil organic matter

1998 ◽  
Vol 26 (3) ◽  
pp. 235-242 ◽  
Author(s):  
Z. N. Senwo ◽  
M. A. Tabatabai
Keyword(s):  
Organic Matter ◽  
Amino Acid ◽  
Soil Organic Matter ◽  
Amino Acid Composition ◽  
Acid Composition

scholarly journals Turnover of the Soil Organic Matter Amino Acid Fraction Investigated by 13C and 14C Signatures of Carboxyl Carbon

Radiocarbon ◽  
2016 ◽  
Vol 59 (2) ◽  
pp. 473-481 ◽  
Author(s):  
Christine Hatté ◽  
Claude Noury ◽  
Louay Kheirbeik ◽  
Jérôme Balesdent
Keyword(s):  
Organic Matter ◽  
Amino Acid ◽  
Soil Organic Matter ◽  
Specific Method ◽  
Food Protein ◽  
Acid Fraction ◽  
Nitrogenous Compounds ◽  
Microbial Utilization ◽  
Effect Theory ◽  
Carboxyl Carbon

AbstractNitrogenous compounds of soil organic matter constitute a major N reservoir on Earth. Both the world food protein supply produced by agriculture and the global contamination by reactive nitrogen species rely on the dynamics of these compounds. To investigate their dynamics, we used both natural 13C labeling and accelerator mass spectrometry (AMS) 14C dating of the α-carboxyl amino carbon, which is specific of the amino acid fraction that was extracted from bulk soil organic matter by ninhydrin hydrolysis. We applied this isotopic approach to investigate the age of carboxyl carbon in a maize-cultivated Cambisol chronosequence. Based on a few measurements, we demonstrate the feasibility of this new compound-specific method of investigation of soil carbon dynamics. We show that soil organic matter amino acids can be split into two very distinct dynamic compartments: the majority having a mean age of a few years and a minority having a mean carbon age of several millennia. The latter fraction can be either strongly stabilized in soils, or can arise from microbial utilization of old carbon resources, as predicted by the priming effect theory.

Sign in / Sign up

Export Citation Format

Share Document