Soil carbon dioxide and methane fluxes from forests and other land use types in an African tropical montane region

Wanyama, Ibrahim; Pelster, David E.; Butterbach‐Bahl, Klaus; Verchot, Louis V.; Martius, Christopher; Rufino, Mariana C.

doi:10.1007/s10533-019-00555-8

Cited by 49 publications

(68 citation statements)

References 71 publications

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“…Furthermore, this can even cause a shift from net uptake to net release of soil CH 4 in some areas of tropics where studies reported net emission of CH 4 from soils within converted ecosystems (Keller et al, ; Simona et al, ). Our results confirmed that the conversion of tropical forest served as an important contributor to atmospheric CH 4 enrichment at large scale (Pendall et al, ; Tate, ; Wanyama et al, ).…”

Section: Discussionsupporting

confidence: 89%

Changes in soil greenhouse gas fluxes by land use change from primary forest

Han

Zhu

2020

Global Change Biology

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Primary forest conversion is a worldwide serious problem associated with human disturbance and climate change. Land use change from primary forest to plantation, grassland or agricultural land may lead to profound alteration in the emission of soil greenhouse gases (GHG). Here, we conducted a global meta‐analysis concerning the effects of primary forest conversion on soil GHG emissions and explored the potential mechanisms from 101 studies. Our results showed that conversion of primary forest significantly decreased soil CO2 efflux and increased soil CH4 efflux, but had no effect on soil N2O efflux. However, the effect of primary forest conversion on soil GHG emissions was not consistent across different types of land use change. For example, soil CO2 efflux did not respond to the conversion from primary forest to grassland. Soil N2O efflux showed a prominent increase within the initial stage after conversion of primary forest and then decreased over time while the responses of soil CO2 and CH4 effluxes were consistently negative or positive across different elapsed time intervals. Moreover, either within or across all types of primary forest conversion, the response of soil CO2 efflux was mainly moderated by changes in soil microbial biomass carbon and root biomass while the responses of soil N2O and CH4 effluxes were related to the changes in soil nitrate and soil aeration‐related factors (soil water content and bulk density), respectively. Collectively, our findings highlight the significant effects of primary forest conversion on soil GHG emissions, enhance our knowledge on the potential mechanisms driving these effects and improve future models of soil GHG emissions after land use change from primary forest.

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Section: Discussionsupporting

confidence: 89%

Changes in soil greenhouse gas fluxes by land use change from primary forest

Han

Zhu

2020

Global Change Biology

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“…As expected, SOC increased with the C/N ratio (Fig 4A), which is an indicator of the difficulty of soil organic matter decomposition by soil microbes, decreasing decomposition rates of SOC with increasing soil C/N (Wanyama et al, 2019;Xu et al, 2016b). Conversely, total soil N conditioned livestock type effect on SOC in a surprising way.…”

Section: Geophysical Predictors Driving Socsupporting

confidence: 69%

Interactions between biogeochemical and management factors explain soil organic carbon in Pyrenean grasslands

Rodrı́guez¹,

Canals²,

Plaixats³

et al. 2020

Preprint

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Abstract. Grasslands are one of the major sinks of terrestrial soil organic carbon (SOC). Understanding how environmental and management factors drive SOC is challenging because they are scale-dependent, with large scale drivers affecting SOC both directly and through drivers working at detailed spatial scales. Here we addressed how regional, landscape and grazing management, soil properties and nutrients and herbage quality factors affect SOC in mountain grasslands in the Pyrenees. Taking advantage of the high variety of environmental heterogeneity in the Pyrenees, we fit a set of models with explicative purposes using data that comprise a wide range of environmental and management conditions. We found that temperature seasonality (MMT) was the most important geophysical driver of SOC in our study. MMT was positively related to SOC but only under certain local conditions: exposed hillsides, steep slopes and relatively highly grazed areas. High MMT conditions probably are more favourable for plant biomass production, but landscape and grazing management factors buffer the accumulation of this biomass into SOC. Concerning biochemical SOC predictors, we obtained some surprising, interactive effects between grazer type, soil nutrients and herbage quality. Soil N was a crucial factor modulating effects of livestock species and neutral detergent fibre content of plant biomass and herbage recalcitrance effects varied depending on grazer species. These results highlight the gaps in the knowledge about SOC drivers in grassland under different environmental and management conditions, and they may serve to generate testable hypothesis in latter studies directed to climate change mitigation policies.

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“…In addition to climatic conditions, forest management practices/ land use change could strongly influence soil-atmosphere CO 2 exchange (Ju et al, 2016;Kooch et al, 2016;Wanyama et al, 2019).…”

Section: Effects Of Soil Properties and Microbial Communitymentioning

confidence: 99%

“…We did not find significant relationships between CH 4 fluxes and soil properties across forest types, suggesting the complex effects of factors. It has been reported that soil N availability (i.e., NH 4 + and NO 3 − ) can have positive (Hassler et al, 2015) or negative effects (Wanyama et al, 2019) on methane oxidation. The negative effects are attributed to the competition of NH 4 + and CH 4 for the methane mono-oxygenase enzyme (Wanyama et al, 2019).…”

Section: Ch 4 Fluxmentioning

confidence: 99%

“…Generally, forest regeneration patterns alter species composition, soil condition, and the microbial community; thus, it directly affects the sinks and/or sources of GHG (Tang et al, 2006;van Haren et al, 2013). To date, several studies have focused on soil GHG fluxes in forests originating from different processes (Kooch, Moghimian, Bayranvand, & Alberti, 2016;Liu, Zhang, Hu, & Tang, 2014;Sun, Zhang, & Wu, 2013;Tang et al, 2006;Ullah, Frasier, King, Picotte-Anderson, & Moore, 2008;Wanyama et al, 2019). However, the results of these studies vary greatly (Fang, Yu, Zhou, Zhou, & Dai, 2016;Tang et al, 2006).…”

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confidence: 99%

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Soil‐atmosphere exchange of greenhouse gases from typical subalpine forests on the eastern Qinghai‐Tibetan Plateau: Effects of forest regeneration patterns

et al. 2020

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Forest regeneration plays an important role in the carbon (C) and nitrogen (N) budget after clear‐cutting. Nonetheless, the effects of regeneration pattern on soil‐atmosphere exchange of greenhouse gases (GHG; CO2, CH4 and N2O) remain poorly understood on the eastern Qinghai‐Tibetan Plateau. This study reports measured field layer GHG fluxes from Picea asperata broadleaved mixed forest (MF, mixed forests with planted P. asperata and natural regeneration of broadleaved species), natural secondary forest (NF, natural without assisted regeneration), and P. asperata plantation forest (PF, artificial planting) to investigate the influence of regeneration patterns on soil GHG fluxes. The soils of the three forest types acted as CO2 and N2O sources and CH4 sinks. The seasonal variation in GHG fluxes was related to soil temperature, rather than soil moisture. Forest types originating from different regeneration processes exhibited different gaseous C fluxes (CO2 and CH4), but did not exhibit significant effect on N2O emissions. NF and MF had higher CO2 emissions than PF. The difference was related to soil C and N density, NH4+ concentration, and soil β‐glucosidase activity, rather than the soil microbial community. NF had higher CH4 uptake than the other two forest types, which is possibly related to specific individual phospholipid fatty acids. Overall, forest types differing in regeneration patterns had a significant impact on the C balance from the perspective of soil‐atmosphere exchange of gaseous C at our site. Therefore, the GHG fluxes should be considered when taking measures of forest management and regeneration practices in this region.

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Soil carbon dioxide and methane fluxes from forests and other land use types in an African tropical montane region

Cited by 49 publications

References 71 publications

Changes in soil greenhouse gas fluxes by land use change from primary forest

Changes in soil greenhouse gas fluxes by land use change from primary forest

Interactions between biogeochemical and management factors explain soil organic carbon in Pyrenean grasslands

Soil‐atmosphere exchange of greenhouse gases from typical subalpine forests on the eastern Qinghai‐Tibetan Plateau: Effects of forest regeneration patterns

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