Libmonster ID: BY-1573

Nature often demonstrates the following regularity: products, synthesized by some microbes, are consumed by others with an "appetite". Here is a typical example: bacteria, residing in benthic sediments of bogs and rice-fields or in the intestines of ruminants, constantly excrete methane (CH4) into the atmosphere. But this gas has "consumers"-it is oxidized by metanotrophic bacteria of forest soils. However, if in the latter case we observe large concentrations of nitrogen compounds, they suppress an oxidizing activity of the given metanotrophs. Therefore, of great interest is a work of a group of scientists from Russia and Germany, who, for the first time, proved that both the efficiency of bacterial oxidation of methane and an extent of nitrogen influence on the corresponding process depend on the species of trees growing in the forest. The journalist Nataliya Reznik told about these studies with

стр. 22

reference to a publication in the journal Doklady RAN (RAS Reports), No. 1, Vol. 447, 2012, on the pages of electronic edition of Science and Technologies of Russia-STRF.ru.

Methane is second in significance gas, participating in creation of hothouse effect, and that is why scientists are searching for methods of minimizing its influence. Specialists from the Institute of Forest named after V. Suka-chev, RAS SB, the Siberian Federal University (Krasnoyarsk), Lomonosov Moscow State University and Max Planck Institute for Terrestrial Microbiology (Marburg, Germany) are carrying out experiments for a number of years, trying to elucidate a role of some natural factors in fixation of methane. The work has been supported by the RFFR, RF Ministry of Education and Science, US Civilian Research and Development Foundation (CRDF) and Alexander von Humboldt Foundation (Germany).

In the focus of attention of international community are soil microorganisms, which annually remove from the atmosphere approximately 30 mln t of hothouse gases, which makes up 6-10 percent of its annual outflow (disappearance). Methane easily penetrates into the struc-turized forest soil, to places, inhabited by methano-trophs. As was mentioned above, CH4 consumption by these organisms depends on the nitrogen content: in case of its abundance, bacterial activity decreases. Meanwhile, contamination by compounds of this element, caused by industrial discharges and climate warming, becomes more and more evident. And so, specialists are constantly worried by the problem of nitrogen influence on methane fixation in different forest soils.

In 1971-1972, staff members of the laboratory of soil science under the Institute of Forest, RAS SB, laid an experimental plot, 50 km away from the north-west of Krasnoyarsk. Without mixing different species, they compactly planted spruce, pine, cedar, aspen, birch and larch, i.e. practically all main forest-forming species of Siberia, and already for four decades are studying processes of excretion and fixation of hothouse gases. In 2006, the senior research assistant of this institute Oleg Menyailo, Dr. Sc. (Biol.), in cooperation with colleagues from Germany, demonstrated: different arboreal species differently affect CH4 oxidation activity in soil-the highest level was observed under arboreal species, the lowest-in fir-groves.

Russian and German scientists verified how atmospheric methane oxidation activity is affected by different concentrations of nitrate and ammonia salts under trees of four species. They took samples of grey forest soils from under common spruce, larch, aspen and birch. The samples were incubated in the presence of CH4 and ammonia sulphate or potassium nitrate. Three days later, the developers determined the methane oxidation level. As a result, it was for the first time established: ammonia salts suppress CH4 consumption speed stronger than nitrates, which in low concentrations even stimulate the activity of methanotrophs. The most interesting thing is that an inhibiting effect of nitrogen compounds depends on tree species, from under which is taken the soil. The lowest is observed under spruce, and the highest-under birch. Thus, in case of 50 mg/kg concentration of ammonia salts, CH4 oxidation activity in birch-groves decreases by two thirds.

Earlier Oleg Menyailo with coauthors established that specific composition of methanotrophs on all experimental plots was identical. But arboreal species affect a lot of soil processes, especially nitrogen fixation and mineralization. Microorganisms, residing under conifers, seize this element very rapidly, hence, their compounds do not accumulate in the soil. "Perhaps, differences in immobilization speed of nitrogen mineral forms under different arboreal species cause a dissimilar effect of nitrogen addition on the activity of methanotrophs", presupposes Menyailo.

It should be exphasized that by suppressing the capacity of soil microorganisms to fix methane, nitric contamination strengthens the hothouse effect. However, assessing the consequences of such contamination of the soil, it is necessary to take into account predominant arboreal species and the main form of nitrous compound.

N. Reznik, Russian Scientists Have Learned What Happens With Methane Under Trees.- Electronic Edition of "Science and Technologies of Russia-STRF.ru", December 24, 2012

Illustrations from STRF.ru site

Prepared by Sergei MAKAROV


© biblioteka.by

Permanent link to this publication:

https://biblioteka.by/m/articles/view/METHANE-UNDER-TREES

Similar publications: LBelarus LWorld Y G


Publisher:

Беларусь АнлайнContacts and other materials (articles, photo, files etc)

Author's official page at Libmonster: https://biblioteka.by/Libmonster

Find other author's materials at: Libmonster (all the World)GoogleYandex

Permanent link for scientific papers (for citations):

METHANE... UNDER TREES // Minsk: Belarusian Electronic Library (BIBLIOTEKA.BY). Updated: 02.11.2021. URL: https://biblioteka.by/m/articles/view/METHANE-UNDER-TREES (date of access: 27.02.2024).

Found source (search robot):


Comments:



Reviews of professional authors
Order by: 
Per page: 
 
  • There are no comments yet
Related topics
Publisher
Беларусь Анлайн
Минск, Belarus
170 views rating
02.11.2021 (847 days ago)
0 subscribers
Rating
0 votes
Related Articles
THE COLLAPSE OF LIBYA AS A FACTOR OF TENSION IN AFRICA AND THE MEDITERRANEAN
Catalog: География 
2 days ago · From Ales Teodorovich
AN IMMIGRANT
3 days ago · From Yanina Selouk
APEC COUNTRIES: TECHNOLOGY TRANSFER AS A DEVELOPMENT FACTOR
Catalog: Разное 
3 days ago · From Yanina Selouk
КНР И ФРГ: НОВОЕ НАПОЛНЕНИЕ ВСЕОБЪЕМЛЮЩЕГО СТРАТЕГИЧЕСКОГО ПАРТНЕРСТВА?
Catalog: Экономика 
3 days ago · From Yanina Selouk
АФРИКАНСКИЕ САММИТЫ АЗИАТСКИХ ДЕРЖАВ: ОБЩЕЕ И ОСОБЕННОЕ
8 days ago · From Yanina Selouk
ВОСХОДЯЩЕЕ СОЛНЦЕ КОНСЕРВАТИЗМА
Catalog: Разное 
9 days ago · From Yanina Selouk
РОЛЬ ТРАДИЦИЙ В ЯПОНСКОМ МЕНЕДЖМЕНТЕ И ИХ ТРАНСФОРМИРОВАНИЕ В XXI ВЕКЕ
Catalog: Экономика 
11 days ago · From Yanina Selouk
"ПЛАЧУЩАЯ ВДОВА" ПОКОРИВШАЯ МИР
Catalog: История 
11 days ago · From Yanina Selouk
CANCELLATION OF THE "ONE FAMILY, ONE CHILD" POLICY IN CHINA
Catalog: Лайфстайл 
11 days ago · From Yanina Selouk
Israel: A WAR ON TWO FRONTS
11 days ago · From Yanina Selouk

New publications:

Popular with readers:

News from other countries:

BIBLIOTEKA.BY - Belarusian digital library, repository, and archive

Create your author's collection of articles, books, author's works, biographies, photographic documents, files. Save forever your author's legacy in digital form. Click here to register as an author.
Library Partners

METHANE... UNDER TREES
 

Editorial Contacts
Chat for Authors: BY LIVE: We are in social networks:

About · News · For Advertisers

Biblioteka.by - Belarusian digital library, repository, and archive ® All rights reserved.
2006-2024, BIBLIOTEKA.BY is a part of Libmonster, international library network (open map)
Keeping the heritage of Belarus


LIBMONSTER NETWORK ONE WORLD - ONE LIBRARY

US-Great Britain Sweden Serbia
Russia Belarus Ukraine Kazakhstan Moldova Tajikistan Estonia Russia-2 Belarus-2

Create and store your author's collection at Libmonster: articles, books, studies. Libmonster will spread your heritage all over the world (through a network of affiliates, partner libraries, search engines, social networks). You will be able to share a link to your profile with colleagues, students, readers and other interested parties, in order to acquaint them with your copyright heritage. Once you register, you have more than 100 tools at your disposal to build your own author collection. It's free: it was, it is, and it always will be.

Download app for Android