Soil greenhouse gas emissions and grazing management in northern temperate grasslands

Ma, Zilong; Shrestha, Bharat M.; Bork, Edward W.; Chang, Scott X.; Carlyle, Cameron N.; Döbert, Timm F.; Sobrinho, Laio Silva; Boyce, Mark S.

doi:10.1016/j.scitotenv.2021.148975

Cited by 17 publications

(7 citation statements)

References 61 publications

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“…In this sense, it is especially important to apply management practices that mitigate this type of emission [73], which are mainly related to managing the stocking rate and feeding supplementation. In the first case, it is suggested to maintain relatively low stocking rates [74,75]. In this study, even though the conventional system showed a higher stocking rate of cattle, the difference was not significant, which explains why there were no significant differences in emissions related to cattle raising (Table 3).…”

Section: Greenhouse Gas Balance Of Different Types Of Agriculturementioning

confidence: 64%

Historical Changes in Agricultural Systems and the Current Greenhouse Gas Emissions in Southern Chile

et al. 2023

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Agricultural activities are important contributors to greenhouse gas (GHG) emissions in southern Chile. Three types of agricultural systems coexist within this region: traditional, conventional and agroecological. Historical changes in agricultural practices were identified from bibliographic sources and field surveys of 10 farms of each system type. A similarity analysis between systems was carried out using the survey data, which were also input to the Cool Farm Tool software to estimate GHG emissions of carbon dioxide, methane and nitrous oxide. The main historical changes identified were: (i) replacement of organic inputs by chemical products, (ii) replacement of workforce by agricultural machinery, (iii) decrease in crop diversity and (iv) decrease in total agricultural area. A multivariate analysis showed that agroecological systems are different from the traditional and conventional systems mainly because of the land use and the amount of organic fertiliser applied. However, no significant differences were found in the GHG emissions, which on average were 2999 ± 1521, 3443 ± 2376 and 3746 ± 1837 kg CO2-eq ha−1 year−1 (traditional, conventional and agroecological, respectively). Enteric fermentation was the main source of emissions in all agricultural systems, therefore methane was the most important GHG. Identifying the sources and practices that produce more emissions should help to improve management to reduce GHG emissions.

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Section: Greenhouse Gas Balance Of Different Types Of Agriculturementioning

confidence: 64%

Historical Changes in Agricultural Systems and the Current Greenhouse Gas Emissions in Southern Chile

et al. 2023

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“…Grazing events (foraging, trampling and excrements) could change soil water content, soil temperature, and the substrates supply from plant part to soil biota and microorganism that mediate the progress of GHG emissions production (Dowhower et al, 2020). Recent studies also showed that GHG emissions were affected by stocking rate rather than grazing system in grassland ecosystem (Ma et al, 2021; Wang et al, 2019). For example, increased yak excrement decomposition under high stocking rate may promote CO 2 emission by microbes through stimulating soil organic matter mineralization (Tang et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Recent studies also showed that GHG emissions were affected by stocking rate rather than grazing system in grassland ecosystem (Ma et al, 2021;Wang et al, 2019). For example, increased yak excrement decomposition under high stocking rate may promote CO 2 emission by microbes through stimulating soil organic matter mineralization (Tang et al, 2021).…”

Section: Responses Of Ghg Emissions To Pika Burrowing and Yak Grazingmentioning

confidence: 99%

Plateau pika burrowing and yak grazing jointly determine ecosystem greenhouse gas emissions of alpine meadow

et al. 2022

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Domestic yak (Bos grunniens) have coexisted with plateau pika (Ochotona curzoniae) for thousands of and they play irreplaceable roles in shaping the structure and function of alpine meadow ecosystem. However, the mechanisms whereby the greenhouse gas (GHG) emissions change in response to the interactive effects between yak grazing and plateau pika burrowing remain unclear. In this study, we examined the response of ecosystem GHG emissions (CO 2 , CH 4 , and N 2 O flux) to yak grazing and pika burrowing in alpine meadow in Zoige County, China. The GHG emissions was measured with a static opaque chamber method. Our results revealed that CO 2 , CH 4 , N 2 O flux and CO 2 -eq were significantly influenced by yak grazing and pika burrowing independently, and in conjunction. Crucially, the relative importance of pika burrowing was higher than yak grazing on a pastoral scale. Specifically, high pika burrowing led to an increase of 440.29%, and 110.72% for CO 2 -eq relative to low pika burrowing under moderate and heavy yak grazing situations, respectively. The value of CO 2 -eq with low pika burrowing was negative, especially under light yak grazing conditions. Furthermore, we found that GHG emissions were sensitive to plant species richness, soil temperature, soil moisture, soil organic carbon, and soil microbial factors. Structural equation modeling indicated that pika burrowing can affect CO 2 -eq though altering soil temperature and belowground biomass under heavy yak grazing conditions and changing soil moisture and soil microbe under light yak grazing. The results of this study enrich our understanding of the role of small burrowing mammals in the carbon sequestration of alpine meadow. In the context of the carbon neutrality of alpine grassland ecosystem, small mammals' activities and their interactions with domestic livestock-induced changes in microtopography on GHG emissions should not be neglected.

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“…In short, PV arrays have the potential to alter the soil temperature and soil moisture during the operation period in grassland ecosystems. Previous studies in grassland ecosystems have demonstrated that soil temperature and soil moisture can influence GHG emissions by regulating soil organic matter mineralization, chemical reaction rates, , and gas diffusion in the soil, stimulating the growth and activity of grass roots and microorganisms, and altering microbial nitrification and denitrification processes. , Therefore, PV arrays are expected to have the potential to influence GHG emissions in grassland ecosystems. However, few studies have been conducted to investigate the driving factors of PV arrays that affect GHG emissions from their host grassland ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Ignoring the Effects of Photovoltaic Array Deployment on Greenhouse Gas Emissions May Lead to Overestimation of the Contribution of Photovoltaic Power Generation to Greenhouse Gas Reduction

Zhang

et al. 2023

Environ. Sci. Technol.

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Photovoltaic (PV) power generation is one of the world's most promising options for carbon emission reduction. However, whether the operation period of solar parks can increase greenhouse gas (GHG) emissions in hosting natural ecosystems has not been fully considered. Here, we conducted a field experiment to compensate for the lack of evaluation of the effects of PV array deployment on GHG emissions. Our results show that the PV arrays caused significant differences in air microclimate, soil properties, and vegetation characteristics. Simultaneously, PV arrays had more significant effects on CO 2 and N 2 O emissions but a minor impact on CH 4 uptake in the growing season. Of all the environmental variables included, soil temperature and moisture were the main drivers of GHG flux variation. The sustained flux global warming potential from the PV arrays significantly increased by 8.14% compared to the ambient grassland. Our evaluation models identified that the GHG footprint of PV arrays during the operation period on grasslands was 20.62 g CO 2 -eq kW h −1 . Compared with our model estimates, GHG footprint estimates reported in previous studies were generally less by 25.46−50.76%. The contribution of PV power generation to GHG reduction may be overestimated without considering the impact of PV arrays on hosting ecosystems.

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Soil greenhouse gas emissions and grazing management in northern temperate grasslands

Cited by 17 publications

References 61 publications

Historical Changes in Agricultural Systems and the Current Greenhouse Gas Emissions in Southern Chile

Historical Changes in Agricultural Systems and the Current Greenhouse Gas Emissions in Southern Chile

Plateau pika burrowing and yak grazing jointly determine ecosystem greenhouse gas emissions of alpine meadow

Ignoring the Effects of Photovoltaic Array Deployment on Greenhouse Gas Emissions May Lead to Overestimation of the Contribution of Photovoltaic Power Generation to Greenhouse Gas Reduction

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