Soil Carbon Dioxide Fluxes from Three Forest Types of the Tropical Montane Rainforest on Hainan Island, China

Jiang, Xinhua; Chen, Huai; Peng, Changhui; Li, Yide; He, Yixin; Chen, Dexiang; Mu, Lin; Jian, Hu; Ma, Ting; Liu, Liangfeng; Li, Xinwei; Miao, Xiangshui; Liu, Yinggao

doi:10.1007/s11270-016-2904-1

Cited by 6 publications

(4 citation statements)

References 64 publications

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“…The GHG flux rates were calculated using linear regression of gas concentrations versus chamber closure time and corrected for temperature and moisture, using Eq. 2 outlined in Jiang et al [44]. where F is the flux rate in mg C m −2 h −1 for CO 2 , μg C m −2 h −1 for CH 4 and μg N m −2 h −1 for N 2 O; P is the atmospheric pressure of the sampling site (Pa); M is the gas mass (g mol −1 ); dc / dt is the rate of concentration change; T is the absolute chamber temperature at sampling time (°C); Vo , Po , and To are the molar volume, atmospheric pressure, and absolute chamber temperature, respectively (ml, Pa, and °C), under standard conditions; and H is the chamber height over the soil surface (cm).…”

Section: Methodsmentioning

confidence: 99%

Pasture enclosures increase soil carbon dioxide flux rate in Semiarid Rangeland, Kenya

Oduor

Karanja

Onwonga

et al. 2018

Carbon Balance Manage

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BackgroundPasture enclosures play an important role in rehabilitating the degraded soils and vegetation, and may also influence the emission of key greenhouse gasses (GHGs) from the soil. However, no study in East Africa and in Kenya has conducted direct measurements of GHG fluxes following the restoration of degraded communal grazing lands through the establishment of pasture enclosures. A field experiment was conducted in northwestern Kenya to measure the emission of CO2, CH4 and N2O from soil under two pasture restoration systems; grazing dominated enclosure (GDE) and contractual grazing enclosure (CGE), and in the adjacent open grazing rangeland (OGR) as control. Herbaceous vegetation cover, biomass production, and surface (0–10 cm) soil organic carbon (SOC) were also assessed to determine their relationship with the GHG flux rate.ResultsVegetation cover was higher enclosure systems and ranged from 20.7% in OGR to 40.2% in GDE while aboveground biomass increased from 72.0 kg DM ha−1 in OGR to 483.1 and 560.4 kg DM ha−1 in CGE and GDE respectively. The SOC concentration in GDE and CGE increased by an average of 27% relative to OGR and ranged between 4.4 g kg−1 and 6.6 g kg−1. The mean emission rates across the grazing systems were 18.6 μg N m−2 h−1, 50.1 μg C m−2 h−1 and 199.7 mg C m−2 h−1 for N2O, CH4, and CO2, respectively. Soil CO2 emission was considerably higher in GDE and CGE systems than in OGR (P < 0.001). However, non-significantly higher CH4 and N2O emissions were observed in GDE and CGE compared to OGR (P = 0.33 and 0.53 for CH4 and N2O, respectively). Soil moisture exhibited a significant positive relationship with CO2, CH4, and N2O, implying that it is the key factor influencing the flux rate of GHGs in the area.ConclusionsThe results demonstrated that the establishment of enclosures in tropical rangelands is a valuable intervention for improving pasture production and restoration of surface soil properties. However, a long-term study is required to evaluate the patterns in annual CO2, N2O, CH4 fluxes from soils and determine the ecosystem carbon balance across the pastoral landscape.

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Section: Methodsmentioning

confidence: 99%

Pasture enclosures increase soil carbon dioxide flux rate in Semiarid Rangeland, Kenya

Oduor

Karanja

Onwonga

et al. 2018

Carbon Balance Manage

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“…Tropical forest soils play an important role in the Earth's radiative balance by sequestering and releasing significant amounts of carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O; Mosier et al, 2004). It is estimated that tropical forest soils emit about 1.3 ± 0.3 Tg N 2 O yr −1 (Butterbach-Bahl et al, 2004), capture 6.4 Tg CH 4 yr −1 (Dutaur and Verchot, 2007), sequester about 10 % of the total atmospheric CO 2 via photosynthesis, and account for about 30 % of the world's soil C stocks (Jobbágy and Jackson, 2000;Malhi and Phillips, 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Yet, P deficiency typical of tropical soils can have direct impacts on ecosystem biomass production if the limitation is lifted (John et al, 2007). Furthermore, nearly all the studies conducted in (sub-)tropical forest ecosystems were, so far, concentrated in China (Jiang et al 2016;Yan et al, 2008;Zheng et al, 2016), Central America (Corre et al, 2014;Koehler et al, 2009a;Matson et al, 2014), and South America (Martinson et al, 2013;Müller et al, 2015;Wolf et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Nutrient limitations regulate soil greenhouse gas fluxes from tropical forests: evidence from an ecosystem-scale nutrient manipulation experiment in Uganda

Tamale

Hüppi

Griepentrog

et al. 2021

SOIL

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Abstract. Soil macronutrient availability is one of the abiotic controls that alters the exchange of greenhouse gases (GHGs) between the soil and the atmosphere in tropical forests. However, evidence on the macronutrient regulation of soil GHG fluxes from central African tropical forests is still lacking, limiting our understanding of how these biomes could respond to potential future increases in nitrogen (N) and phosphorus (P) deposition. The aim of this study was to disentangle the regulation effect of soil nutrients on soil GHG fluxes from a Ugandan tropical forest reserve in the context of increasing N and P deposition. Therefore, a large-scale nutrient manipulation experiment (NME), based on 40 m×40 m plots with different nutrient addition treatments (N, P, N + P, and control), was established in the Budongo Central Forest Reserve. Soil carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) fluxes were measured monthly, using permanently installed static chambers, for 14 months. Total soil CO2 fluxes were partitioned into autotrophic and heterotrophic components through a root trenching treatment. In addition, soil temperature, soil water content, and nitrates were measured in parallel to GHG fluxes. N addition (N and N + P) resulted in significantly higher N2O fluxes in the transitory phase (0–28 d after fertilization; p<0.01) because N fertilization likely increased soil N beyond the microbial immobilization and plant nutritional demands, leaving the excess to be nitrified or denitrified. Prolonged N fertilization, however, did not elicit a significant response in background (measured more than 28 d after fertilization) N2O fluxes. P fertilization marginally and significantly increased transitory (p=0.05) and background (p=0.01) CH4 consumption, probably because it enhanced methanotrophic activity. The addition of N and P (N + P) resulted in larger CO2 fluxes in the transitory phase (p=0.01), suggesting a possible co-limitation of both N and P on soil respiration. Heterotrophic (microbial) CO2 effluxes were significantly higher than the autotrophic (root) CO2 effluxes (p<0.01) across all treatment plots, with microbes contributing about two-thirds of the total soil CO2 effluxes. However, neither heterotrophic nor autotrophic respiration significantly differed between treatments. The results from this study suggest that the feedback of tropical forests to the global soil GHG budget could be disproportionately altered by increases in N and P availability over these biomes.

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“…Yet, P deficiency typical of tropical soils can have direct impacts on ecosystem biomass production if the limitation is lifted (John et al, 2007). Furthermore, nearly all the studies so far conducted in (sub-) tropical forest ecosystems were concentrated in China (Jiang et al, 2016;Yan 85 et al, 2008;Zheng et al, 2016), Central America (Corre et al, 2014;Koehler et al, 2009a;Matson et al, 2014) and…”

mentioning

confidence: 99%

Nutrient limitations regulate soil greenhouse gas fluxes from tropical forests: evidence from an ecosystem-scale nutrient manipulation experiment in Uganda

Tamale¹,

Hüppi²,

Griepentrog³

et al. 2021

Preprint

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Abstract. Tropical forests contribute significantly to the emission and uptake of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). However, studies on the soil environmental controls of greenhouse gases (GHGs) from African tropical forest ecosystems are still rare. The aim of this study was to disentangle the regulation effect of soil nutrients on soil GHG fluxes in a tropical forest in northwestern Uganda. Therefore, a large-scale nutrient manipulation experiment (NME) based on 40 m × 40 m plots with different nutrient addition treatments (nitrogen (N), phosphorus (P), N + P, and control) was established. Soil CO2, CH4, and N2O fluxes were measured monthly using permanently installed static chambers for 14 months. Total soil CO2 fluxes were partitioned into autotrophic and heterotrophic components through a root trenching treatment. In addition, soil temperature, soil water content, and mineral N were measured in parallel to GHG fluxes. N addition (N, N + P) resulted in significantly higher N2O fluxes in the transitory phase (0–28 days after fertilization, p

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Soil Carbon Dioxide Fluxes from Three Forest Types of the Tropical Montane Rainforest on Hainan Island, China

Cited by 6 publications

References 64 publications

Pasture enclosures increase soil carbon dioxide flux rate in Semiarid Rangeland, Kenya

Pasture enclosures increase soil carbon dioxide flux rate in Semiarid Rangeland, Kenya

Nutrient limitations regulate soil greenhouse gas fluxes from tropical forests: evidence from an ecosystem-scale nutrient manipulation experiment in Uganda

Nutrient limitations regulate soil greenhouse gas fluxes from tropical forests: evidence from an ecosystem-scale nutrient manipulation experiment in Uganda

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