Effects of nitrogen fertilization on soil respiration in temperate grassland in Inner Mongolia, China

Peng, Qunjia; Dong, Yu; Qi, Yu; Xiao, Suguang; He, Yongtao; Ma, Tao

doi:10.1007/s12665-010-0605-4

Cited by 95 publications

(49 citation statements)

References 55 publications

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“…Keeping LAI constant at < 1 (Fig. 7) revealed a still highly significant effect of T a on soil CO 2 fluxes, supporting the notion that management impacts on soil flux magnitudes of CO 2 are rather small compared to environmental drivers (Peng et al, 2011).…”

Section: Co 2 Fluxessupporting

confidence: 64%

Temporal and spatial variations of soil CO2, CH4 and N2O fluxes at three differently managed grasslands

et al. 2013

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Abstract. A profound understanding of temporal and spatial variabilities of soil carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) fluxes between terrestrial ecosystems and the atmosphere is needed to reliably quantify these fluxes and to develop future mitigation strategies. For managed grassland ecosystems, temporal and spatial variabilities of these three soil greenhouse gas (GHG) fluxes occur due to changes in environmental drivers as well as fertilizer applications, harvests and grazing. To assess how such changes affect soil GHG fluxes at Swiss grassland sites, we studied three sites along an altitudinal gradient that corresponds to a management gradient: from 400 m a.s.l. (intensively managed) to 1000 m a.s.l. (moderately intensive managed) to 2000 m a.s.l. (extensively managed). The alpine grassland was included to study both effects of extensive management on CH4 and N2O fluxes and the different climate regime occurring at this altitude. Temporal and spatial variabilities of soil GHG fluxes and environmental drivers on various timescales were determined along transects of 16 static soil chambers at each site. All three grasslands were N2O sources, with mean annual soil fluxes ranging from 0.15 to 1.28 nmol m−2 s−1. Contrastingly, all sites were weak CH4 sinks, with soil uptake rates ranging from −0.56 to −0.15 nmol m−2 s−1. Mean annual soil and plant respiration losses of CO2, measured with opaque chambers, ranged from 5.2 to 6.5 μmol m−2 s−1. While the environmental drivers and their respective explanatory power for soil N2O emissions differed considerably among the three grasslands (adjusted r2 ranging from 0.19 to 0.42), CH4 and CO2 soil fluxes were much better constrained (adjusted r2 ranging from 0.46 to 0.80) by soil water content and air temperature, respectively. Throughout the year, spatial heterogeneity was particularly high for soil N2O and CH4 fluxes. We found permanent hot spots for soil N2O emissions as well as locations of permanently lower soil CH4 uptake rates at the extensively managed alpine site. Including hot spots was essential to obtain a representative mean soil flux for the respective ecosystem. At the intensively managed grassland, management effects clearly dominated over effects of environmental drivers on soil N2O fluxes. For CO2 and CH4, the importance of management effects did depend on the status of the vegetation (LAI).

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Section: Co 2 Fluxessupporting

confidence: 64%

Temporal and spatial variations of soil CO2, CH4 and N2O fluxes at three differently managed grasslands

et al. 2013

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“…The lack of N effect on SR in 2014 may be attributed to the counteractive responses of soil microbial respiration and root respiration to N addition. In the first year, N addition ameliorated the nutrient limitation for microbes; thus, soil microbial activity and biomass increased in the short term (Treseder, 2008) and subsequently stimulated microbial respiration (Peng et al, 2011). On the other hand, N addition could reduce belowground biomass allocation (Haynes and Gower, 1995), leading to a decrease in root respiration.…”

Section: Diverse Responses Of C Flux Components To the N Addition Gramentioning

confidence: 99%

Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes

et al. 2017

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Abstract. Increases in nitrogen (N) deposition can greatly stimulate ecosystem net carbon (C) sequestration through positive N-induced effects on plant productivity. However, how net ecosystem CO 2 exchange (NEE) and its components respond to different N addition rates remains unclear. Using an N addition gradient experiment (six levels: 0, 2, 4, 8, 16, 32 gN m −2 yr −1 ) in an alpine meadow on the Qinghai-Tibetan Plateau, we explored the responses of different ecosystem C fluxes to an N addition gradient and revealed mechanisms underlying the dynamic responses. Results showed that NEE, ecosystem respiration (ER), and gross ecosystem production (GEP) all increased linearly with N addition rates in the first year of treatment but shifted to N saturation responses in the second year with the highest NEE (−7.77 ± 0.48 µmol m −2 s −1 ) occurring under an N addition rate of 8 gN m −2 yr −1 . The saturation responses of NEE and GEP were caused by N-induced accumulation of standing litter, which limited light availability for plant growth under high N addition. The saturation response of ER was mainly due to an N-induced saturation response of aboveground plant respiration and decreasing soil microbial respiration along the N addition gradient, while decreases in soil microbial respiration under high N addition were caused by N-induced reductions in soil pH. We also found that various components of ER, including aboveground plant respiration, soil respiration, root respiration, and microbial respiration, responded differentially to the N addition gradient. These results reveal temporal dynamics of N impacts and the rapid shift in ecosystem C fluxes from N limitation to N saturation. Our findings bring evidence of short-term initial shifts in responses of ecosystem C fluxes to increases in N deposition, which should be considered when predicting long-term changes in ecosystem net C sequestration.

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“…It was reported that specific root-derived respiration is higher during early vegetative growth and decline thereafter during reproductive and senescence stages (Fu et al 2002, Sey et al 2010, Jans et al 2010. Further, soil CO 2 emissions have found to be regulated by soil temperature and moisture (Peng et al 2011, Allaire et al 2012, Dhadli et al 2015. Soil moisture coupled with soil temperature and other soil-atmospheric interactions had been found to greatly affect soil CO 2 emissions, and an increase for shorter period after N application was also recorded (Dhadli et al 2015, Mbonimpa et al 2015.…”

mentioning

confidence: 98%

“…Further, cropping systems can influence CO 2 emission by affecting the quality and quantity of C returned to the soil as root biomass or as straw incorporation or mulching (Mapanda et al 2011, Gong et al 2012, Ding et al 2014). Additionally, due to variations in management practices in different cropping systems, soil temperature and water content which directly control CO 2 emission are also influenced (Peng et al 2011, Allaire et al 2012, Zhang et al 2013, Dhadli et al 2015.…”

mentioning

confidence: 99%

Effect of long-term differential application of inorganic fertilizers and manure on soil CO2 emissions

Dhadli¹,

Brar²

2016

Plant Soil Environ.

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Carbon dioxide (CO 2 ) fluxes from agricultural soils have been considered as one of the important environmental impact issue, due to their role in global warming and also its mitigation by carbon (C) sequestration in soils. Substantial scope of C sequestration with the application of inorganic fertilizers and manures has been reported, but the long-term effects of continuous application need to be critically examined. To study the effect of continuous differential application of NPK fertilizers and farmyard manure (FYM) in maize-wheat cropping system, CO 2 fluxes were measured via closed chambers and gas chromatography in a long-term experiment in progress for the past 42 years. The average daily CO 2 fluxes differed significantly amongst various treatments and were 55, 26 and 92% higher in NPK, N and NPK + FYM treatments over the control in the maize crop season and 43, 8 and 83% in the wheat crop season. Highly significant correlation of CO 2 emissions was found with soil organic carbon and total nitrogen in the maize and the wheat crop seasons. Although, CO 2 emissions were higher from long-term inorganic fertilizers and FYM treatments, still they are environmentally sustainable management practices, as they increased soil fertility and crop yields which consequently resulted in higher atmospheric CO 2 capture by plants and carbon sequestration in soils.

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Effects of nitrogen fertilization on soil respiration in temperate grassland in Inner Mongolia, China

Cited by 95 publications

References 55 publications

Temporal and spatial variations of soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O fluxes at three differently managed grasslands

Temporal and spatial variations of soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O fluxes at three differently managed grasslands

Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes

Effect of long-term differential application of inorganic fertilizers and manure on soil CO<sub>2</sub> emissions

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Effects of nitrogen fertilization on soil respiration in temperate grassland in Inner Mongolia, China

Cited by 95 publications

References 55 publications

Temporal and spatial variations of soil CO&lt;sub&gt;2&lt;/sub&gt;, CH&lt;sub&gt;4&lt;/sub&gt; and N&lt;sub&gt;2&lt;/sub&gt;O fluxes at three differently managed grasslands

Temporal and spatial variations of soil CO&lt;sub&gt;2&lt;/sub&gt;, CH&lt;sub&gt;4&lt;/sub&gt; and N&lt;sub&gt;2&lt;/sub&gt;O fluxes at three differently managed grasslands

Initial shifts in nitrogen impact on ecosystem carbon fluxes in an alpine meadow: patterns and causes

Effect of long-term differential application of inorganic fertilizers and manure on soil CO<sub>2</sub> emissions

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Product

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Temporal and spatial variations of soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O fluxes at three differently managed grasslands

Temporal and spatial variations of soil CO<sub>2</sub>, CH<sub>4</sub> and N<sub>2</sub>O fluxes at three differently managed grasslands