Impact of elevated CO2 and temperature on soil C and N dynamics in relation to CH4 and N2O emissions from tropical flooded rice (Oryza sativa L.)

Bhattacharyya, Pratap; Roy, K.S.; Neogi, S.; Dash, P.K.; Nayak, A. K.; Mohanty, SK; Baig, M. J.; Sarkar, Ramani Kumar; Rao, K. S.

doi:10.1016/j.scitotenv.2013.05.035

Cited by 112 publications

(35 citation statements)

References 66 publications

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“…This explanation is supported by the positive correlation between warming effects on ligninase activity and soil C:N, while no clear relationship is found for the responses of cellulase activity (Supporting information Figure S6). At last, warming‐induced changes in soil microclimate (Domínguez, Holthof, Smith, Koller, & Emmett, ; Zhou et al., ), fresh C input (Bhattacharyya, Roy, Neogi, Dash et al., ; Xue et al., ; Yin et al., ), and plant community composition (Kardol, Cregger, Campany, & Classen, ; Steinauer et al., ) can all cause substantial changes in microbial communities as well.…”

Section: Discussionmentioning

confidence: 99%

Differential responses of carbon‐degrading enzyme activities to warming: Implications for soil respiration

Chen

Luo

García‐Palacios

et al. 2018

Global Change Biology

156

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Extracellular enzymes catalyze rate-limiting steps in soil organic matter decomposition, and their activities (EEAs) play a key role in determining soil respiration (SR). Both EEAs and SR are highly sensitive to temperature, but their responses to climate warming remain poorly understood. Here, we present a meta-analysis on the response of soil cellulase and ligninase activities and SR to warming, synthesizing data from 56 studies. We found that warming significantly enhanced ligninase activity by 21.4% but had no effect on cellulase activity. Increases in ligninase activity were positively correlated with changes in SR, while no such relationship was found for cellulase. The warming response of ligninase activity was more closely related to the responses of SR than a wide range of environmental and experimental methodological factors. Furthermore, warming effects on ligninase activity increased with experiment duration. These results suggest that soil microorganisms sustain long-term increases in SR with warming by gradually increasing the degradation of the recalcitrant carbon pool.

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Section: Discussionmentioning

confidence: 99%

Differential responses of carbon‐degrading enzyme activities to warming: Implications for soil respiration

Chen

Luo

García‐Palacios

et al. 2018

Global Change Biology

156

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“…Soil labile C pools serve as readily available energy sources for soil microorganisms, thereby contributing to enhanced nutrient cycling in soils. In the present study, pool sizes of labile C were estimated from: (a) active C pools with short residence time, determined by soil incubations and inverse modeling (Carrillo, Pendall, Dijkstra, Morgan, & Newcomb, 2011;Feng et al, 2017); (b) readily hydrolysable or oxidizable C or dissolved organic C or water-or K 2 SO 4 -extractable C (Bhattacharyya et al, 2013) and (c) light fraction C, determined by physical soil fractionation (Song et al, 2012;von Lützow et al, 2007). Detailed information on the measurements and proxies of labile C pools can be found in the online supplementary materials and methods in Supporting Information S1.…”

Section: Soil Carbon Poolsmentioning

confidence: 99%

Soil carbon loss with warming: New evidence from carbon‐degrading enzymes

Chen

Elsgaard

Groenigen

et al. 2020

Global Change Biology

175

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Climate warming affects soil carbon (C) dynamics, with possible serious consequences for soil C stocks and atmospheric CO2 concentrations. However, the mechanisms underlying changes in soil C storage are not well understood, hampering long‐term predictions of climate C‐feedbacks. The activity of the extracellular enzymes ligninase and cellulase can be used to track changes in the predominant C sources of soil microbes and can thus provide mechanistic insights into soil C loss pathways. Here we show, using meta‐analysis, that reductions in soil C stocks with warming are associated with increased ratios of ligninase to cellulase activity. Furthermore, whereas long‐term (≥5 years) warming reduced the soil recalcitrant C pool by 14%, short‐term warming had no significant effect. Together, these results suggest that warming stimulates microbial utilization of recalcitrant C pools, possibly exacerbating long‐term climate‐C feedbacks.

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“…The dynamics of carbon and nitrogen in converted orchard fields significantly differed from those in paddy fields in which anaerobic decomposition process was dominant. It has been reported that CH 4 was actively produced in the anaerobic soil conditions with the preference of methanogens and emitted to the atmosphere through the rice plants (Bhattacharyya et al 2013;Nazaries et al 2013). Conversely, anaerobic conditions in the paddy plots limited nitrate availability, and anaerobiosis favored denitrification to N 2 (Zou et al 2007), thus leading to the lower N 2 O emissions.…”

Section: Effects Of Land Use Conversion On Soil Ch 4 and N 2 O Fluxesmentioning

confidence: 99%

Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

Liu

et al. 2016

Environ Sci Pollut Res

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Land use conversion and fertilization have been widely reported to be important managements affecting the exchanges of greenhouse gases between soil and atmosphere. For comprehensive assessment of methane (CH 4 ) and nitrous oxide (N 2 O) fluxes from hilly red soil induced by land use conversion and fertilization, a 14-month continuous field measurement was conducted on the newly converted citrus orchard plots with fertilization (OF) and without fertilization (ONF) and the conventional paddy plots with fertilization (PF) and without fertilization (PNF). Our results showed that land use conversion from paddy to orchard reduced the CH 4 fluxes at the expense of increasing the N 2 O fluxes. Furthermore, fertilization significantly decreased the CH 4 fluxes from paddy soils in the second stage after conversion, but it failed to affect the CH 4 fluxes from orchard soils, whereas fertilizer applied to orchard and paddy increased soil N 2 O emissions by 68 and 113.9 %, respectively. Thus, cumulative CH 4 emissions from the OF were 100 % lower, and N 2 O emissions were 421 % higher than those from the PF. Although cumulative N 2 O emissions were stimulated in the newly converted orchard, the strong reduction of CH 4 led to lower global warming potentials (GWPs) as compared to the paddy. Besides, fertilization in orchard increased GWPs but decreased GWPs of paddy soils. In addition, measurement of soil moisture, temperature, dissolved carbon contents (DOCs), and ammonia (NH 4 + -N) and nitrate (NO 3 − -N) contents indicated a significant variation in soil properties and contributed to variations in soil CH 4 and N 2 O fluxes. Results of this study suggest that land use conversion from paddy to orchard would benefit for reconciling greenhouse gas mitigation and citrus orchard cultivation would be a better agricultural system in the hilly red soils in terms of greenhouse gas emission. Moreover, selected fertilizer rate applied to paddy would lead to lower GWPs of CH 4 and N 2 O. Nevertheless, more field measurements from newly converted orchard are highly needed to gain an insight into national and global accounting of CH 4 and N 2 O emissions.

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Impact of elevated CO2 and temperature on soil C and N dynamics in relation to CH4 and N2O emissions from tropical flooded rice (Oryza sativa L.)

Cited by 112 publications

References 66 publications

Differential responses of carbon‐degrading enzyme activities to warming: Implications for soil respiration

Differential responses of carbon‐degrading enzyme activities to warming: Implications for soil respiration

Soil carbon loss with warming: New evidence from carbon‐degrading enzymes

Effects of land use conversion and fertilization on CH4 and N2O fluxes from typical hilly red soil

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