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Type of publication: Tezės kituose recenzuojamuose leidiniuose / Theses in other peer-reviewed publications (T1e)
Field of Science: Ekologija ir aplinkotyra / Ecology and environmental sciences (N012)
Author(s): Baležentienė, Ligita;Mikša, Ovidijus
Title: Impact of soil physical parameters on respiration in ley and wheat agroecosystems
Is part of: Environment and Soil Resources Conservation: book of proceedings 10th International Soil Science Congress, 17–19 October, 2018. Almaty, 2018
Extent: p. 51
Date: 2018
Keywords: CO2 fluxes;bio-parameters;crops
Abstract: The increasing anthropogenic CO2 emissions into atmosphere force the choice of grown crops aimed at mitigate climate change. Carbon exchange in ecosystems or net ecosystem production (NEP) is defined as the difference between gross primary production and total ecosystem respiration, and represents the total amount of organic carbon in an ecosystem available for storage in biomass. These gains and losses is a fundamental property of ecosystems that are is becoming an important challenge for the agro sector. For this reason, investigations of seasonal carbon exchange were carried out in 2013–2016 at the Training Farm of A. Stulginskis University, Lithuania. The aim was to investigate and compare carbon exchange rate of different crops, viz. maize, grassland, winter wheat, spring rapeseed and barley of conventional farming. This study comprised carbon exchange rate, specifically, emitted and absorbed CO2 fluxes (µmol m-2s-1) applying closed chamber method. The biomass measurement (g m-2) and leaf area index (LAI, m2 m-2) calculation at different plant growth stages were used to evaluate carbon exchange in different agro ecosystems. The differences in photosynthetically assimilated CO2 rates were significantly impacted by leaf area index (p=0.04) during plant vegetation period. The significant (p=1.02 and 0.50) strong correlation (r=0.6-0.7) exist between soil respiration (Rs) and LAI. Soil respiration composed only 21% of agroecosystem carbon exchange. Plant respiration (Ra) ranged between 0.034 and 3.613 µmol m-2s-1 during vegetation period composing negligible ratio (mean 16%) of carbon exchange. Generally, respiration emissions were obviously recovered by crops gross primary production (GPP). Therefore the ecosystems were acting as atmospheric CO2 sink. Rapeseed accumulated the lowest mean GPP 11.46 µmol m-2s-1
Affiliation(s): Vytauto Didžiojo universitetas
Žemės ūkio akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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