Elevated temperatures drive abiotic and biotic degradation of organic matter in a peat bog under oxic conditions

AminiTabrizi, Roya; Dontsova, Katerina; Grachet, Nathalia Graf; Tfaily, Malak M.

doi:10.1016/j.scitotenv.2021.150045

Cited by 21 publications

(11 citation statements)

References 91 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After comparing the effects of temperature, moisture, and photosynthetically active radiation on RE and GEE, we found that temperature was the main influencing factor, which is consistent with many studies [ 49 , 50 ]. However, in some plant photosynthesis and respiration models [ 51 , 52 , 53 , 54 ], GEE is mainly calculated based on light and RE is mainly calculated based on temperature, which is different from the results of this paper.…”

Section: Discussionsupporting

confidence: 89%

“…An analysis of the relationship between various temperature indicators and CO 2 flux revealed that with the increase in Tave , Tmax , Tmin , and AcT , RE and GEE increased in the three climate zones. This indicates that the increase in temperature may increase the decomposition of SOM, change the activity of extracellular enzymes, thereby changing the strategy of the microbial community to obtain nutrients, control the biogeochemical cycle of soil nutrients, and lead to an increase in CO 2 emissions [ 49 , 50 ]; at the same time, the nutrients released by SOM decomposition and microbial activities are beneficial to plant growth, leading to enhanced photosynthesis and respiration. However, Tef is negatively correlated with RE and GEE, which indicates that the increase in extreme weather will increase the mortality of vegetation [ 56 , 57 , 58 ] and reduce photosynthesis and respiration [ 59 ].…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Climate Change on CO2 Flux in Temperate Grassland, Subtropical Artificial Coniferous Forest and Tropical Rain Forest Ecosystems

Man

Che

Xie

et al. 2021

IJERPH

View full text Add to dashboard Cite

The interactions between CO2 flux, an important component of ecosystem carbon flux, and climate change vary significantly among different ecosystems. In this research, the inter-annual variation characteristics of ecosystem respiration (RE), gross ecosystem exchange (GEE), and net ecosystem exchange (NEE) were explored in the temperate grassland (TG) of Xilinhot (2004–2010), the subtropical artificial coniferous forest (SACF) of Qianyanzhou (2003–2010), and the tropical rain forest (TRF) of Xishuangbanna (2003–2010). The main factors of climate change affecting ecosystem CO2 flux were identified by redundancy analysis, and exponential models and temperature indicators were constructed to consider the relationship between climate change and CO2 flux. Every year from 2003 to 2010, RE and GEE first increased and then decreased, and NEE showed no significant change pattern. TG was a carbon source, whereas SACF and TRF were carbon sinks. The influence of air temperature on RE and GEE was greater than that of soil temperature, but the influence of soil moisture on RE and GEE was greater than that of air moisture. Compared with moisture and photosynthetically active radiation, temperature had the greatest impact on CO2 flux and the exponential model had the best fitting effect. In TG and SACF, the average temperature was the most influential factor, and in TRF, the accumulated temperature was the most influential factor. These results provide theoretical support for mitigating and managing climate change and provide references for achieving carbon neutrality.

show abstract

Section: Discussionsupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Effect of Climate Change on CO2 Flux in Temperate Grassland, Subtropical Artificial Coniferous Forest and Tropical Rain Forest Ecosystems

Man

Che

Xie

et al. 2021

IJERPH

View full text Add to dashboard Cite

show abstract

“…An increased temperature can alter the nutrient acquisition strategies of microbial communities. This is achieved by changing extracellular enzyme activities through the priming of decomposition of SOM, which leads to increased emissions of CO 2 from peatlands ( AminiTabrizi et al, 2022 ). NAG participates in N conversion and plays a significant part in the decomposition of nitrogenous substances in soil as it facilitates the degradation of chitin ( Liu et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Soil CO2 and N2O emissions and microbial abundances altered by temperature rise and nitrogen addition in active-layer soils of permafrost peatland

et al. 2022

View full text Add to dashboard Cite

Changes in soil CO2 and N2O emissions due to climate change and nitrogen input will result in increased levels of atmospheric CO2 and N2O, thereby feeding back into Earth’s climate. Understanding the responses of soil carbon and nitrogen emissions mediated by microbe from permafrost peatland to temperature rising is important for modeling the regional carbon and nitrogen balance. This study conducted a laboratory incubation experiment at 15 and 20°C to observe the impact of increasing temperature on soil CO2 and N2O emissions and soil microbial abundances in permafrost peatland. An NH4NO3 solution was added to soil at a concentration of 50 mg N kg−1 to investigate the effect of nitrogen addition. The results indicated that elevated temperature, available nitrogen, and their combined effects significantly increased CO2 and N2O emissions in permafrost peatland. However, the temperature sensitivities of soil CO2 and N2O emissions were not affected by nitrogen addition. Warming significantly increased the abundances of methanogens, methanotrophs, and nirK-type denitrifiers, and the contents of soil dissolved organic carbon (DOC) and ammonia nitrogen, whereas nirS-type denitrifiers, β-1,4-glucosidase (βG), cellobiohydrolase (CBH), and acid phosphatase (AP) activities significantly decreased. Nitrogen addition significantly increased soil nirS-type denitrifiers abundances, β-1,4-N- acetylglucosaminidase (NAG) activities, and ammonia nitrogen and nitrate nitrogen contents, but significantly reduced bacterial, methanogen abundances, CBH, and AP activities. A rising temperature and nitrogen addition had synergistic effects on soil fungal and methanotroph abundances, NAG activities, and DOC and DON contents. Soil CO2 emissions showed a significantly positive correlation with soil fungal abundances, NAG activities, and ammonia nitrogen and nitrate nitrogen contents. Soil N2O emissions showed positive correlations with soil fungal, methanotroph, and nirK-type denitrifiers abundances, and DOC, ammonia nitrogen, and nitrate contents. These results demonstrate the importance of soil microbes, labile carbon, and nitrogen for regulating soil carbon and nitrogen emissions. The results of this study can assist simulating the effects of global climate change on carbon and nitrogen cycling in permafrost peatlands.

show abstract

“…Therefore, the young seedlings, which are the most susceptible to nutrient deficiency among all other stages in the life of a tree, in the absence of mycorrhizal partners, must develop different strategies to overcome the nutrient limitation. One of these strategies is to intensify the rhizosphere processes, particularly the enzyme activities, which catalyze the nutrient release from soil organic matter ( Marschner et al., 2011 ; Dijkstra et al., 2013 ; AminiTabrizi et al., 2022 ). The rhizosphere was broadly defined as the volume of soil influenced by root activity ( Hiltner, 1904 ; Hinsinger, 1998 ).…”

Section: Introductionmentioning

confidence: 99%

Contrasting distribution of enzyme activities in the rhizosphere of European beech and Norway spruce

2022

View full text Add to dashboard Cite

Recent policies and silvicultural management call for forest regeneration that involve the selection of tree species able to cope with low soil nutrient availability in forest ecosystems. Understanding the impact of different tree species on the rhizosphere processes (e.g., enzyme activities) involved in nutrient mobilisation is critical in selecting suitable species to adapt forests to environmental change. Here, we visualised and investigated the rhizosphere distribution of enzyme activities (cellobiohydrolase, leucine-aminopeptidase, and acid phosphomonoesterase) using zymography. We related the distribution of enzyme activities to the seedling root morphological traits of European beech (Fagus sylvatica) and Norway spruce (Picea abies), the two most cultivated temperate tree species that employ contrasting strategies in soil nutrient acquisition. We found that spruce showed a higher morphological heterogeneity along the roots than beech, resulting in a more robust relationship between rhizoplane-associated enzyme activities and the longitudinal distance from the root apex. The rhizoplane enzyme activities decreased in spruce and increased in beech with the distance from the root apex over a power-law equation. Spruce revealed broader rhizosphere extents of all three enzymes, but only acid phosphomonoesterase activity was higher compared with beech. This latter result was determined by a larger root system found in beech compared with spruce that enhanced cellobiohydrolase and leucine-aminopeptidase activities. The root hair zone and hair lengths were significant variables determining the distribution of enzyme activities in the rhizosphere. Our findings indicate that spruce has a more substantial influence on rhizosphere enzyme production and diffusion than beech, enabling spruce to better mobilise nutrients from organic sources in heterogeneous forest soils.

show abstract

Elevated temperatures drive abiotic and biotic degradation of organic matter in a peat bog under oxic conditions

Cited by 21 publications

References 91 publications

Effect of Climate Change on CO2 Flux in Temperate Grassland, Subtropical Artificial Coniferous Forest and Tropical Rain Forest Ecosystems

Effect of Climate Change on CO2 Flux in Temperate Grassland, Subtropical Artificial Coniferous Forest and Tropical Rain Forest Ecosystems

Soil CO2 and N2O emissions and microbial abundances altered by temperature rise and nitrogen addition in active-layer soils of permafrost peatland

Contrasting distribution of enzyme activities in the rhizosphere of European beech and Norway spruce

Contact Info

Product

Resources

About