Soil Respiration in Alder Swamp (Alnus glutinosa) in Southern Taiga of European Russia Depending on Microreliefстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 21 июля 2021 г.
Аннотация:In comparison with thoroughly examined carbon pools and greenhouse gas fluxes of peat bogs, swamp forests have been yet insufficiently studied. This is partly due to forming there physicochemical and hydrological (periodic flooding and drying of the soil) conditions that are extremely heterogeneous in space and time. This significantly complicates their study, producing ambiguous results, especially in short-term field research. From June to October 2013-2016, we measured soil respiration (Rsoil) in an alder swamp using the static chamber method at five microsites: depression (DEP), flat surface (FL), elevation (EL), tussocks (TUS) and near-stem tussocks (STUS). Based on Rsoil measurements, monitoring of ground water level (GWL) and soil temperature, we carried out a computer simulation of the total soil respiration for the season. In 2013-2016, the average Rsoil values (mgC m-2 h-1±σ) on DEP, FL, EL, TUS and STUS comprised 54±50, 94±72, 146±89, 193±96 and 326±183, respectively, whereas the total Rsoil values for the season (tC ha-1 season-1±σ) comprised 2.4±0.6, 4.1±0.6, 6.4±1.9, 8.7±4.3 and 15.1±3.8. According to the results of observations, for most of the season GWL was at the level of several cm below the soil surface. In 2014 and 2015, there were extra dry periods that led to a drop in GWL to a mark of 30-40 cm below the soil surface. Despite their short duration (2-3 weeks), these dry periods can lead to an increase in the total Rsoil for the season from 7 to 41% in the TUS-EL-STUS-FL-DEP sequence.