Carbon dioxide efflux from long-term grazing management systems in a semiarid region

Liebig, Mark A.; Kronberg, Scott L.; Hendrickson, John; Dong, Xuejun; Gross, Jason

doi:10.1016/j.agee.2012.09.015

Cited by 47 publications

(44 citation statements)

References 43 publications

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“…Our results show that grazing exclusion (long-term or shortterm) led to no significant change in mean R e despite detection of increasing trends in plant cover and above-and below-ground biomass, which were consistent with analogous studies in a short grass prairie of Colorado (LeCain et al, 2002), an alpine meadow on the Tibetan plateau (Lin et al, 2011) and the semiarid northern Great Plains of North America (Liebig et al, 2013), but were inconsistent with studies in temperate grasslands and alpine meadows in China (Cao et al, 2004;Jia et al, 2005). Three factors may explain this.…”

Section: Effects Of Grazing Exclusion On Co 2 Fluxsupporting

confidence: 91%

“…In the present study R h accounted for 78.5 % of R e under short-term grazing exclusion and 93.2 % of R e under long-term grazing exclusion, and both were higher than in an alpine meadow on the Tibetan plateau (52.6 %) (Lin et al, 2011). The range in CO 2 efflux of 20.0-76.9 mg m −2 h −1 in our study was lower than the range of 81.1-100.1 mg m −2 h −1 in the semiarid northern Great Plains of North America (Liebig et al, 2013) and the range of 174.7-232.9 mg m −2 h −1 in an alpine meadow on the Tibetan plateau (Cao et al, 2004). We conclude that R h reached its maximum at a value of 305.3 mg m −2 h −1 , which was much lower than the maximum of 695.8 mg m −2 h −1 in an alpine meadow (Cao et al, 2004), and the minimum R h (5.0 mg m −2 h −1 ) accounted for about 12 % of that in the alpine meadow on the Tibetan plateau (41.7 mg m −2 h −1 ) (Cao et al, 2004).…”

Section: Effects Of Grazing Exclusion On Co 2 Fluxcontrasting

confidence: 67%

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Response of carbon dioxide emissions to sheep grazing and N application in an alpine grassland – Part 1: Effect of sheep grazing

et al. 2014

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Abstract. Previous work has failed to address fully the response of (autotrophic and heterotrophic) respiration to grazing in different ecosystems, particularly in alpine grasslands outside the growing season. From 2010 to 2011 a field experiment combined two methods (static closed chambers and a closed dynamic soil CO 2 flux system) in alpine grasslands located in the Tianshan Mountains. We examined the effects of grazing regime on ecosystem respiration (R e ) both outside (NGS) and during (GS) the growing season and determined the pattern of R e in relation to climate change. There was no significant change in CO 2 emissions under grazing. Heterotrophic respiration (R h ) accounted for 78.5 % of R e with short-term grazing exclusion and 93.2 % of R e with longterm grazing exclusion. R e , R h and autotrophic respiration (R a ) fluxes outside the growing season were equivalent to 12.9 %, 14.1 % and 11.4 % of the respective CO 2 fluxes during the growing season. In addition, our results indicate that soil water content played a critical role in R a in the cold and arid environment. Both R h and R e were sensitive to soil temperature. Moreover, our results suggest that grazing exerted no significant effect on CO 2 emissions in these alpine grasslands.

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Section: Effects Of Grazing Exclusion On Co 2 Fluxsupporting

confidence: 91%

Section: Effects Of Grazing Exclusion On Co 2 Fluxcontrasting

confidence: 67%

Response of carbon dioxide emissions to sheep grazing and N application in an alpine grassland – Part 1: Effect of sheep grazing

et al. 2014

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“…The primary challenges in maximizing the potential of rangeland GHG mitigation are to create a complete account of GHG balances across many rangeland ecosystems and to quantify the magnitude and direction of GHG changes, due to interactions between management and environment [119]. Long-term monitoring is needed to thoroughly document mechanisms contributing to C dynamics in semi-arid rangelands in order to fully understand their role as CO 2 sinks, given the anticipated trajectory of future climate change [57,124].…”

Section: Grazingmentioning

confidence: 99%

Drought and Carbon Cycling of Grassland Ecosystems under Global Change: A Review

Lei

Pang

Xing-yong

et al. 2016

Water

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Abstract:In recent years, the increased intensity and duration of droughts have dramatically altered the structure and function of grassland ecosystems, which have been forced to adapt to this change in climate. Combinations of global change drivers such as elevated atmospheric CO 2 concentration, warming, nitrogen (N) deposition, grazing, and land-use change have influenced the impact that droughts have on grassland C cycling. This influence, to some extent, can modify the relationship between droughts and grassland carbon (C) cycling in the multi-factor world. Unfortunately, prior reviews have been primarily anecdotal from the 1930s to the 2010s. We investigated the current state of the study on the interactive impacts of multiple factors under drought scenarios in grassland C cycling and provided scientific advice for dealing with droughts and managing grassland C cycling in a multi-factor world. Currently, adequate information is not available on the interaction between droughts and global change drivers, which would advance our understanding of grassland C cycling responses. It was determined that future experiments and models should specifically test how droughts regulate grassland C cycling under global changes. Previous multi-factor experiments of current and future global change conditions have studied various drought scenarios poorly, including changes in precipitation frequency and amplitude, timing, and interactions with other global change drivers. Multi-factor experiments have contributed to quantifying these potential changes and have provided important information on how water affects ecosystem processes under global change. There is an urgent need to establish a systematic framework that can assess ecosystem dynamic responses to droughts under current and future global change and human activity, with a focus on the combined effects of droughts, global change drivers, and the corresponding hierarchical responses of an ecosystem.

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“…Measurement protocols for assessment of CO 2 , CH 4 , and N 2 O fluxes have been thoroughly described elsewhere (Liebig et al 2010b(Liebig et al , 2013. Briefly, gas fluxes were measured in the grazing treatments from 21 October 2003 to 24 October 2006 using static chamber methodology (Hutchinson and Mosier 1981).…”

Section: Soil and Gas Sample Collection And Analysesmentioning

confidence: 99%

“…Evaluations were conducted three times during the growing season over three consecutive years. To leverage information emanating from the concurrent assessment of soil-atmosphere greenhouse gas fluxes for the same treatments (Liebig et al 2010a(Liebig et al , 2013, potential associations between soil properties and carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O) fluxes were investigated. We hypothesized 1) intra-and interannual variation in soil properties would increase with nitrogen (N) application and/or increasing stocking rate, and 2) soilatmosphere greenhouse gas fluxes would be most frequently associated with plant-available soil N.…”

Section: Introductionmentioning

confidence: 99%

Grazing Management, Season, and Drought Contributions to Near-Surface Soil Property Dynamics in Semiarid Rangeland

Liebig

Kronberg

Hendrickson

et al. 2014

Rangeland Ecology & Management

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Grazing management effects on soil property dynamics are poorly understood. A study was conducted to assess effects of grazing management and season on soil property dynamics and greenhouse gas flux within semiarid rangeland. Grazing management treatments evaluated in the study included two permanent pastures differing in stocking rate (moderately and heavily grazed pastures) and a fertilized, heavily grazed crested wheatgrass (Agropyron desertorum [Fisch. ex. Link] Schult.) pasture near Mandan, North Dakota. Over a period of 3 yr, soil properties were measured in the spring, summer, and fall at 0-5 cm and 5-10 cm. Concurrent to soil-based measurements, fluxes of carbon dioxide, methane, and nitrous oxide were measured on 1-wk to 2-wk intervals and related to soil properties via stepwise regression. High stocking rate and fertilizer nitrogen (N) application within the crested wheatgrass pasture contributed to increased soil bulk density and extractable N, and decreased soil pH and microbial biomass compared to permanent pastures. Soil nitrate nitrogen tended to be greatest at peak aboveground biomass, whereas soil ammonium nitrogen was greatest in early spring. Drought conditions during the third year of the study contributed to nearly two-fold increases in extractable N under the crested wheatgrass pasture and the heavily grazed permanent pasture, but not the moderately grazed permanent pasture. Stepwise regression found select soil properties to be modestly related to soil-atmosphere greenhouse gas fluxes, with model r 2 ranging from 0.09 to 0.76. Electrical conductivity was included most frequently in stepwise regressions and, accordingly, may serve as a useful screening indicator for greenhouse gas ''hot spots'' in grazing land.

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Carbon dioxide efflux from long-term grazing management systems in a semiarid region

Cited by 47 publications

References 43 publications

Response of carbon dioxide emissions to sheep grazing and N application in an alpine grassland – Part 1: Effect of sheep grazing

Response of carbon dioxide emissions to sheep grazing and N application in an alpine grassland – Part 1: Effect of sheep grazing

Drought and Carbon Cycling of Grassland Ecosystems under Global Change: A Review

Grazing Management, Season, and Drought Contributions to Near-Surface Soil Property Dynamics in Semiarid Rangeland

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