esoilБюллетень Почвенного института имени В.В. ДокучаеваDokuchaev Soil Bulletin0136-16942312-4202V.V. Dokuchaev Soil Science Institute10.19047/0136-1694-2018-95-71-89esoil-304Research ArticleСтатьиИЗМЕНЕНИЕ СООТНОШЕНИЯ С : N : Р В СОСТАВЕ ФИТОМАССЫ, ПОЧВЫ И БИОМАССЫ ПОЧВЕННЫХ МИКРООРГАНИЗМОВ ПРИ НАГРЕВАЮЩЕМ И ИССУШАЮЩЕМ ВОЗДЕЙСТВИИ ФАКЕЛА ПОПУТНОГО ГАЗАCHANGES IN C : N : Р RATIOS IN PLANT BIOMASS, SOIL AND SOIL MICROBIAL BIOMASS DUE TO THE WARMING AND DESSICATION EFFECT OF FLARINGДудареваД. М.DudarevaD. M.

Институт физико-химических и биологических проблем почвоведения, Россия, 142290, Пущино, ул. Институтская, 2

Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow oblast, 142290 Russia

darya_dudareva@mail.ruКвиткинаА. К.KvitkinaA. K.

Институт физико-химических и биологических проблем почвоведения, Россия, 142290, Пущино, ул. Институтская, 2

Institute of Physicochemical and Biological Problems in Soil Science, Russian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow oblast, 142290 Russia

ЮсуповИ. А.YusupovI. A.

Ботанический сад Уральского отделения РАН, Россия, 620144, Екатеринбург, ул. 8 Марта, 202а

Botanical Garden of the Ural Branch of the Russian Academy of Sciences, Russia, 620144, Yekaterinburg, st. March 8, 202a

ЕвдокимовИ. В.YevdokimovI. V.

Институт физико-химических и биологических проблем почвоведения, Россия, 142290, Пущино, ул. Институтская, 2

Institute of Physicochemical and Biological Problems in Soil Science, Rus-sian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow oblast, 142290 Russia

Институт физико-химических и биологических проблем почвоведенияРоссияInstitute of Physicochemical and Biological Problems in Soil Science, Russian Academy of SciencesRussian FederationБотанический сад Уральского отделения РАНРоссияBotanical Garden of the Ural Branch of the Russian Academy of SciencesRussian Federation2018011120180957189Copyright © Дударева Д.М., Квиткина А.К., Юсупов И.А., Евдокимов И.В., 20182018Дударева Д.М., Квиткина А.К., Юсупов И.А., Евдокимов И.В.Dudareva D.M., Kvitkina A.K., Yusupov I.A., Yevdokimov I.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://bulletin.esoil.ru/jour/article/view/304

Потепление климата приводит к существенным изменениям в структуре и функционировании наземных экосистем. Экосистемы вблизи факелов сжигания попутного газа могут выполнять роль модельных для изучения влияния потепления на почву и растительность. Если при проведении обычных манипуляционных экспериментов изменяют или контролируют какой-то экофизиологический фактор искусственно, то в рамках нашего исследования использовали антропогенно-измененные экологические условия, сложившиеся под воздействием горения факела. Целью нашего исследования было оценить эффект нагрева и иссушения на стехиометрические соотношения основных химических элементов (C : N : P) в фитомассе сосны, почве и почвенной микробной биомассе. Обнаружено, что в условиях абиотического стресса почвенное органическое вещество (ПОВ) и отмирающая биомасса почвенных микроорганизмов подвергались ускоренной минерализации, причем снижение относительного содержания С в составе устойчивых пулов ПОВ происходило параллельно с увеличением содержания С в самых лабильных пулах – водорастворимых. Значительное сужение соотношения C : N : P в составе хвои вблизи факела послужило дополнительным фактором усиления минерализации органического вещества в почве, выявленного по уменьшению C : N по отношению к фосфору в составе почвы и микробной биомассы. Таким образом, изучение изменений в стехиометрических соотношениях биофильных элементов под действием абиотических факторов представляется весьма многообещающим методологическим подходом для решения проблемы прогнозирования трансформаций в наземных экосистемах в условиях глобальных климатических изменений.

Climate warming results in significant changes in the structure and functioning of terrestrial ecosystems. The ecosystems situated near oil-well gas flares may be used as model ones for studying warming effect on soil and vegetation. By contrast to regular manipulation experiments where ecopysiological factors are modified or controlled artificially, we used anthropogenically affected condi-tions caused by the gas flaring. Our research was aimed to assess the warming and desiccation effect on the stoichiometric ratios of the principle nutrients (C : N : P) in pine phytomass, soil and soil microbial biomass. Soil organic matter (SOM) and dying microbial biomass were found to be exposed to the increased rate of mineralization under conditions of the abiotic stress. In addition, the de-crease of relative С content in sustainable SOM pools occured along with the increase of C content in the most labile water-soluble pools. Accelerated SOM mineralization decreasing C : N with respect to phosphorus ratio in soil and soil microbial biomass was sufficiently intensified by the decrease in C : N : P in pine needles. Thus, studying changes in stoichiometric ratios of biophylic ele-ments as affected by abiotic factors seems to be prospective and promising methodological approach for predicting terrestrial ecosystem transformations under global climate changes.

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The authors declare that there are no conflicts of interest present.