Datum
2023-09-15Autor
Sourav, Suman KumarSubbarayappa, Chickadibburahalli ThimmappaChowdappa, Hanumanthappa DimbaMudalagiriyappaVazhacharickal, Prem JoseMock, AndreaIngold, MarikoBürkert, AndreasSchlagwort
500 Naturwissenschaften 570 Biowissenschaften, Biologie IndienBangalorePhysikochemische BodeneigenschaftBodenatmungKohlendioxidemissionIntensivierungLineares ModellGemischtes ModellMetadata
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Aufsatz![](/themes/Mirage2/images/Open_Access_logo_PLoS_transparent.svg)
Deutsche Forschungsgemeinschaft (Grant Number 279374797), Department of Biotechnology, Ministry of Science and Technology, India (Grant Number FOR2432)
Soil respiration under different N fertilization and irrigation regimes in Bengaluru, S-India
Zusammenfassung
Rapid urbanization in many countries of the Global South has led to intensification of urban and peri-urban agriculture (UPA) whose effects on the soils’ physical, chemical, and microbial properties have been hardly studied. We therefore investigated the effects of different intensity levels, exemplified by three rates of mineral nitrogen (N) addition and irrigation on CO₂ emissions in typical crops during the wet (Kharif) and dry (Rabi) season on a Nitisol in Bengaluru, S-India. Respiration data were collected from 2017 to 2021 in two two-factorial split-plot experiments conducted under rainfed and irrigated conditions. Test crops were maize (Zea mays L.), finger millet (Eleusine coracana Gaertn.), and lablab (Lablab purpureus L. Sweet) under rainfed and irrigated conditions, as well as the vegetables cabbage (Brassica oleracea var. capitata), eggplant (Solanum melongena L.), and tomato (Solanum lycopersicum L.) or chili (Capsicum annuum L.). Carbon dioxide (CO₂) emissions were determined using a Los Gatos Research (LGR) multi-gas analyzer whereby under our study conditions CH₄, NH₃ and N₂O were negligible. Measurements were conducted from 7:00 am to 11:30 am and repeated from 12:30 pm to 6:00 pm. Irrespective of irrigation, season, crops and N fertilizer level, CO₂ emission rates during afternoon hours were significantly higher (2–128%) than during morning hours. In the irrigated field diurnal emission differences between afternoon and morning hours ranged from 0.04 to 1.61 kg CO₂-C ha−¹ h−¹ while in the rainfed field they averaged 0.20–1.78 kg CO₂-C ha−¹ h−¹. Irrespective of crops, in the rainfed field CO₂ emissions in high N plots were 56.4% larger than in low N plots whereas in the irrigated field they were only 12.1% larger. The results of a linear mixed model analysis indicated that N fertilization enhanced CO₂ emissions whereby these effects were highest in rainfed crops. Soil moisture enhanced emissions in rainfed crops but decreased them under irrigation where crop-specific CO₂ emissions within a season were independent of N application. Soil temperature at 5 cm depth enhanced CO₂ emissions in both fields. Overall, higher N and soil temperature enhanced CO₂ fluxes whereas effects of soil moisture depended on irrigation.
Zitierform
In: Nutrient Cycling in Agroecosystems Volume 127 / Issue 3 (2023-09-15) , S. 333-345 ; eissn:1573-0867Förderhinweis
Gefördert im Rahmen des Projekts DEALDeutsche Forschungsgemeinschaft (Grant Number 279374797), Department of Biotechnology, Ministry of Science and Technology, India (Grant Number FOR2432)
Zitieren
@article{doi:10.17170/kobra-202311309138,
author={Sourav, Suman Kumar and Subbarayappa, Chickadibburahalli Thimmappa and Chowdappa, Hanumanthappa Dimba and Mudalagiriyappa and Vazhacharickal, Prem Jose and Mock, Andrea and Ingold, Mariko and Bürkert, Andreas},
title={Soil respiration under different N fertilization and irrigation regimes in Bengaluru, S-India},
journal={Nutrient Cycling in Agroecosystems},
year={2023}
}
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2023-12-01T13:24:43Z 2023-12-01T13:24:43Z 2023-09-15 doi:10.17170/kobra-202311309138 http://hdl.handle.net/123456789/15253 Gefördert im Rahmen des Projekts DEAL Deutsche Forschungsgemeinschaft (Grant Number 279374797), Department of Biotechnology, Ministry of Science and Technology, India (Grant Number FOR2432) eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ CO₂ emission intensification linear mixed model seasonal soil respiration 500 570 Soil respiration under different N fertilization and irrigation regimes in Bengaluru, S-India Aufsatz Rapid urbanization in many countries of the Global South has led to intensification of urban and peri-urban agriculture (UPA) whose effects on the soils’ physical, chemical, and microbial properties have been hardly studied. We therefore investigated the effects of different intensity levels, exemplified by three rates of mineral nitrogen (N) addition and irrigation on CO₂ emissions in typical crops during the wet (Kharif) and dry (Rabi) season on a Nitisol in Bengaluru, S-India. Respiration data were collected from 2017 to 2021 in two two-factorial split-plot experiments conducted under rainfed and irrigated conditions. Test crops were maize (Zea mays L.), finger millet (Eleusine coracana Gaertn.), and lablab (Lablab purpureus L. Sweet) under rainfed and irrigated conditions, as well as the vegetables cabbage (Brassica oleracea var. capitata), eggplant (Solanum melongena L.), and tomato (Solanum lycopersicum L.) or chili (Capsicum annuum L.). Carbon dioxide (CO₂) emissions were determined using a Los Gatos Research (LGR) multi-gas analyzer whereby under our study conditions CH₄, NH₃ and N₂O were negligible. Measurements were conducted from 7:00 am to 11:30 am and repeated from 12:30 pm to 6:00 pm. Irrespective of irrigation, season, crops and N fertilizer level, CO₂ emission rates during afternoon hours were significantly higher (2–128%) than during morning hours. In the irrigated field diurnal emission differences between afternoon and morning hours ranged from 0.04 to 1.61 kg CO₂-C ha−¹ h−¹ while in the rainfed field they averaged 0.20–1.78 kg CO₂-C ha−¹ h−¹. Irrespective of crops, in the rainfed field CO₂ emissions in high N plots were 56.4% larger than in low N plots whereas in the irrigated field they were only 12.1% larger. The results of a linear mixed model analysis indicated that N fertilization enhanced CO₂ emissions whereby these effects were highest in rainfed crops. Soil moisture enhanced emissions in rainfed crops but decreased them under irrigation where crop-specific CO₂ emissions within a season were independent of N application. Soil temperature at 5 cm depth enhanced CO₂ emissions in both fields. Overall, higher N and soil temperature enhanced CO₂ fluxes whereas effects of soil moisture depended on irrigation. open access Sourav, Suman Kumar Subbarayappa, Chickadibburahalli Thimmappa Chowdappa, Hanumanthappa Dimba Mudalagiriyappa Vazhacharickal, Prem Jose Mock, Andrea Ingold, Mariko Bürkert, Andreas doi:10.1007/s10705-023-10311-y Grant Number 279374797, Grant Number FOR2432 Indien Bangalore Physikochemische Bodeneigenschaft Bodenatmung Kohlendioxidemission Intensivierung Lineares Modell Gemischtes Modell publishedVersion eissn:1573-0867 Issue 3 Nutrient Cycling in Agroecosystems 333-345 Volume 127 false
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