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Zhang Y, Zhu G, Zhang K, Huang H, He L, Xu C, Chen H, Su Y, Zhang Y, Fan H, Wang B. Exploring the ecological meanings of temperature sensitivity of ecosystem respiration from different methods. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 923:171403. [PMID: 38431173 DOI: 10.1016/j.scitotenv.2024.171403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/23/2024] [Accepted: 02/28/2024] [Indexed: 03/05/2024]
Abstract
Temperature sensitivity (Q10) of ecosystem respiration (Re) is a critical parameter for predicting global terrestrial carbon dynamics and its response to climate warming. However, the determination of Q10 has been controversial. In this study, we scrutinized the underpinnings of three mainstream methods to reveal their relationships in estimating Q10 for Re in the Heihe River Basin, northwest China. Specifically, these methods are Q10 estimated from the long-term method (Q10_long), short-term method (Q10_short), and the low-frequency (Q10_lf) and high-frequency (Q10_hf) signals decomposed by the singular spectrum analysis (SSA) method. We found that: 1) Q10_lf and Q10_long are affected by the confounding effects caused by non-temperature factors, and are 1.8 ± 0.3 and 1.7 ± 0.3, respectively. 2) The high-frequency signals of the SSA method and short-term method have consistent roles in removing the confounding effects. Both Q10_short and Q10_hf reflect the actual response of respiration to temperature. 3) Overall, Q10_long has a larger variability (1.7 ± 0.3) across different biomes, whereas Q10_short and Q10_hf show convergence (1.4 ± 0.2 and 1.3 ± 0.1, respectively). These results highlight the fact that Q10 can be overestimated by the long-term method, whereas the short-term method and high-frequency signals decomposed by the SSA method can obtain closer and convergent values after removing the confounding effects driven by non-temperature factors. Therefore, it is recommended to use the Q10 value estimated by the short-term method or high-frequency signals decomposed by the SSA method to predict carbon dynamics and its response to global warming in Earth system models.
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Affiliation(s)
- Yang Zhang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Gaofeng Zhu
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China.
| | - Kun Zhang
- School of Biological Sciences and Institute for Climate and Carbon Neutrality, The University of Hong Kong, Hong Kong SAR, China.
| | - Heng Huang
- School of Ecology, Sun Yat-sen University, Shen Zhen 518107, China
| | - Liyang He
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Cong Xu
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Huiling Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China
| | - Yonghong Su
- Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Yuzhong Zhang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Haochen Fan
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
| | - Boyuan Wang
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China
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Dar AA, Chen Z, Rodríguez-Rodríguez S, Haghighat F, González-Rosales B. Assessing greenhouse gas emissions in Cuban agricultural soils: Implications for climate change and rice (Oryza sativa L.) production. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 353:120088. [PMID: 38295640 DOI: 10.1016/j.jenvman.2024.120088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 12/14/2023] [Accepted: 01/08/2024] [Indexed: 02/18/2024]
Abstract
Assessing the impact of greenhouse gas (GHG) emissions on agricultural soils is crucial for ensuring food production sustainability in the global effort to combat climate change. The present study delves to comprehensively assess GHG emissions in Cuba's agricultural soil and analyze its implications for rice production and climate change because of its rich agriculture cultivation tradition and diverse agro-ecological zones from the period of 1990-2022. In this research, based on Autoregressive Distributed Lag (ARDL) approach the empirical findings depicts that in short run, a positive and significant impact of 1.60 percent % in Cuba's rice production. The higher amount of atmospheric carbon dioxide (CO2) levels improves photosynthesis, and stimulates the growth of rice plants, resulting in greater grain yields. On the other hand, rice production index raising GHG emissions from agriculture by 0.35 % in the short run. Furthermore, a significant and positive impact on rice production is found in relation to the farm machinery i.e., 3.1 %. Conversely, an adverse and significant impact of land quality was observed on rice production i.e., -5.5 %. The reliability of models was confirmed by CUSUM and CUSUM square plot. Diagnostic tests ensure the absence of serial correlation and heteroscedasticity in the models. Additionally, the forecasting results are obtained from the three machine learning models i.e. feed forward neural network (FFNN), support vector machines (SVM) and adaptive boosting technique (Adaboost). Through the % MAPE criterion, it is evident that FFNN has achieved high precision (91 %). Based on the empirical findings, the study proposed the adoption of sustainable agricultural practices and incentives should be given to the farmers so that future generations inherit a world that is sustainable, and healthy.
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Affiliation(s)
- Afzal Ahmed Dar
- Department of Building, Civil, and Environmental Engineering, Concordia University, 1455 de Maisonneuve Blvd. W. Montreal, Quebec, Canada H3G 1M8.
| | - Zhi Chen
- Department of Building, Civil, and Environmental Engineering, Concordia University, 1455 de Maisonneuve Blvd. W. Montreal, Quebec, Canada H3G 1M8.
| | | | - Fariborz Haghighat
- Department of Building, Civil, and Environmental Engineering, Concordia University, 1455 de Maisonneuve Blvd. W. Montreal, Quebec, Canada H3G 1M8.
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Alam MA, Khan MI, Cho SR, Lim JY, Song HJ, Kim PJ, Das S. Source partitioning and emission factor of nitrous oxide during warm and cold cropping seasons from an upland soil in South Korea. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 662:591-599. [PMID: 30699379 DOI: 10.1016/j.scitotenv.2019.01.249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 01/18/2019] [Accepted: 01/18/2019] [Indexed: 06/09/2023]
Abstract
Nitrous oxide (N2O) is a major greenhouse gas (GHG) with high global warming potential. A majority of the N2O flux comes from agricultural sources, mainly due to nitrogen (N) fertilization. The soil N2O flux, induced by N fertilization, mainly originated from two different sources, i.e., fertilizer and soil organic nitrogen (SON). It is essential to know the individual contribution of these two different sources in total N2O flux for planning necessary mitigation strategies. It is also indispensable to know the seasonal difference of emission factors (EF) for having more accurate N2O inventory. Therefore, an experiment was conducted in a South Korean upland soil during summer and winter seasons using 15N labeled urea as an artificial N source and source specific N2O emissions were distinguished under different environmental conditions. To characterize the N2O emissions from urea, 0, 50, 100 and 200% of the Korean N recommendation rate was selected for specified crops. The Korean N recommendation rate for red pepper (Capsicum annuum) and garlic (Allium sativum) was 190 and 250 kg N ha-1, respectively. Direct emissions from urea were estimated from the difference of 15N2O flux emitted from 15N-urea treated soil and the natural abundance of 15N2O. From total N2O fluxes, urea originated N2O flux was 0.87% and 0.13% of the applied N in warm and cold seasons, respectively and the rest comes from SON. Nitrous oxide EF in the warm season was 2.69% of applied N and in the cold season that was 0.25%. Nitrous oxide fluxes showed a significant exponential relationship with soil temperature. The results show the necessity of considering the different N2O EF for warm and cold cropping seasons to reduce uncertainty in N2O inventory. The findings of this research may help better understand N2O source partitioning and the emission budget from warm and cold cropping seasons.
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Affiliation(s)
- Muhammad Ashraful Alam
- Division of Applied Life Science, Gyeongsang National University, Jinju 660-701, South Korea
| | - Muhammad Israr Khan
- Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, South Korea
| | - Song Rae Cho
- Division of Applied Life Science, Gyeongsang National University, Jinju 660-701, South Korea
| | - Ji Yeon Lim
- Division of Applied Life Science, Gyeongsang National University, Jinju 660-701, South Korea
| | - Hyun Ji Song
- Division of Applied Life Science, Gyeongsang National University, Jinju 660-701, South Korea
| | - Pil Joo Kim
- Division of Applied Life Science, Gyeongsang National University, Jinju 660-701, South Korea; Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, South Korea.
| | - Suvendu Das
- Institute of Agriculture and Life Sciences, Gyeongsang National University, Jinju 660-701, South Korea.
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Günther AB, Huth V, Jurasinski G, Glatzel S. Scale-dependent temporal variation in determining the methane balance of a temperate fen. ACTA ACUST UNITED AC 2013. [DOI: 10.1080/20430779.2013.850395] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Bonnett SAF, Blackwell MSA, Leah R, Cook V, O'Connor M, Maltby E. Temperature response of denitrification rate and greenhouse gas production in agricultural river marginal wetland soils. GEOBIOLOGY 2013; 11:252-67. [PMID: 23480257 DOI: 10.1111/gbi.12032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 01/28/2013] [Indexed: 05/26/2023]
Abstract
Soils are predicted to exhibit significant feedback to global warming via the temperature response of greenhouse gas (GHG) production. However, the temperature response of hydromorphic wetland soils is complicated by confounding factors such as oxygen (O2 ), nitrate (NO3-) and soil carbon (C). We examined the effect of a temperature gradient (2-25 °C) on denitrification rates and net nitrous oxide (N2 O), methane (CH4 ) production and heterotrophic respiration in mineral (Eutric cambisol and Fluvisol) and organic (Histosol) soil types in a river marginal landscape of the Tamar catchment, Devon, UK, under non-flooded and flooded with enriched NO3- conditions. It was hypothesized that the temperature response is dependent on interactions with NO3--enriched flooding, and the physicochemical conditions of these soil types. Denitrification rate (mean, 746 ± 97.3 μg m(-2) h(-1) ), net N2 O production (mean, 180 ± 26.6 μg m(-2) h(-1) ) and net CH4 production (mean, 1065 ± 183 μg m(-2) h(-1) ) were highest in the organic Histosol, with higher organic matter, ammonium and moisture, and lower NO3- concentrations. Heterotrophic respiration (mean, 127 ± 4.6 mg m(-2) h(-1) ) was not significantly different between soil types and dominated total GHG (CO2 eq) production in all soil types. Generally, the temperature responses of denitrification rate and net N2 O production were exponential, whilst net CH4 production was unresponsive, possibly due to substrate limitation, and heterotrophic respiration was exponential but limited in summer at higher temperatures. Flooding with NO3- increased denitrification rate, net N2 O production and heterotrophic respiration, but a reduction in net CH4 production suggests inhibition of methanogenesis by NO3- or N2 O produced from denitrification. Implications for management and policy are that warming and flood events may promote microbial interactions in soil between distinct microbial communities and increase denitrification of excess NO3- with N2 O production contributing to no more than 50% of increases in total GHG production.
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Affiliation(s)
- S A F Bonnett
- Department of Crops and Environment Sciences, Harper Adams University, Newport, UK.
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