Shifts in microbial trophic strategy explain different temperature sensitivity of CO2 flux under constant and diurnally varying temperature regimes

Zhen Bai; Hongtu Xie; Jenny Kao-Kniffin; Baodong Chen; Pengshuai Shao; Chao Liang

doi:10.1093/femsec/fix063

Earliness per se×temperature interaction: consequences on leaf, spikelet, and floret development in wheat

Journal of Experimental Botany ◽

10.1093/jxb/erz568 ◽

2019 ◽

Vol 71 (6) ◽

pp. 1956-1968 ◽

Cited By ~ 1

Author(s):

Paula Prieto ◽

Helga Ochagavía ◽

Simon Griffiths ◽

Gustavo A Slafer

Keyword(s):

Temperature Sensitivity ◽

Flag Leaf ◽

Near Isogenic Lines ◽

Earliness Per Se ◽

Temperature Regimes ◽

Significant Difference ◽

Number Of Leaves ◽

Per Se ◽

Temperature Interaction ◽

Leaf Appearance

Abstract Wheat adaptation can be fine-tuned by earliness per se (Eps) genes. Although the effects of Eps genes are often assumed to act independently of the environment, previous studies have shown that they exhibit temperature sensitivity. The number of leaves and phyllochron are considered determinants of flowering time and the numerical components of yield include spikelets per spike and fertile floret number within spikelets. We studied the dynamics of leaf, spikelet, and floret development in near isogenic lines with either late or early alleles of Eps-D1 under seven temperature regimes. Leaf appearance dynamics were modulated by temperature, and Eps alleles had a greater effect on the period from flag leaf to heading than phyllochron. In addition, the effects of the Eps alleles on spikelets per spike were minor, and more related to spikelet plastochron than the duration of the early reproductive phase. However, fertile floret number was affected by the interaction between Eps alleles and temperature. So, at 9 °C, Eps-early alleles had more fertile florets than Eps-late alleles, at intermediate temperatures there was no significant difference, and at 18 °C (the highest temperature) the effect was reversed, with lines carrying the late allele producing more fertile florets. These effects were mediated through changes in floret survival; there were no clear effects on the maximum number of floret primordia.

Download Full-text

The Effect of Temperature Preconditioning on the Temperature Sensitivity of Net CO2 Flux in Geographically Diverse Populations of the Moss Polytrichum Commune

Ecology ◽

10.2307/1937820 ◽

1983 ◽

Vol 64 (5) ◽

pp. 1100-1108 ◽

Cited By ~ 15

Author(s):

Bjartmar Sveinbjornsson ◽

Walter C. Oechel

Keyword(s):

Temperature Sensitivity ◽

Co2 Flux ◽

Effect Of Temperature ◽

Diverse Populations ◽

Polytrichum Commune

Download Full-text

Temperature sensitivity of a PLFA-distinguishable microbial community differs between varying and constant temperature regimes

Geoderma ◽

10.1016/j.geoderma.2017.08.026 ◽

2017 ◽

Vol 308 ◽

pp. 54-59 ◽

Cited By ~ 6

Author(s):

Zhen Bai ◽

Qiang Ma ◽

Xin Wu ◽

Yulan Zhang ◽

Wantai Yu

Keyword(s):

Microbial Community ◽

Constant Temperature ◽

Temperature Sensitivity ◽

Temperature Regimes

Download Full-text

Environmental correlates of peatland carbon fluxes in a thawing landscape: do transitional thaw stages matter?

Biogeosciences Discussions ◽

10.5194/bgd-12-445-2015 ◽

2015 ◽

Vol 12 (1) ◽

pp. 445-480 ◽

Cited By ~ 1

Author(s):

A. Malhotra ◽

N. T. Roulet

Keyword(s):

Temperature Sensitivity ◽

Structural Changes ◽

Co2 Flux ◽

Apparent Temperature ◽

Ecosystem Structure ◽

Environmental Correlates ◽

C Storage ◽

Discontinuous Permafrost ◽

Significant Area ◽

And Function

Abstract. Peatlands in discontinuous permafrost regions occur as a mosaic of wetland types, each with variable sensitivity to climate change. Permafrost thaw further increases the spatial heterogeneity in ecosystem structure and function in peatlands. Carbon (C) fluxes are well characterized in end-member thaw stages such as fully intact or fully thawed permafrost but remain unconstrained for transitional stages that cover a significant area of thawing peatlands. Furthermore, changes in the environmental correlates of C fluxes, due to thaw are not well described: a requirement for modeling future changes to C storage of permafrost peatlands. We investigated C fluxes and their correlates in end-member and a number of transitional thaw stages in a sub-arctic peatland. Across peatland lumped CH4 and CO2 flux data had significant correlations with expected correlates such as water table depth, thaw depth, temperature, photosynthetically active radiation and vascular green area. Within individual thaw states, bivariate correlations as well as multiple regressions between C flux and environmental factors changed variably with increasing thaw. The variability in directions and magnitudes of correlates reflects the range of structural conditions that could be present along a thaw gradient. These structural changes correspond to changes in C flux controls, such as temperature and moisture, and their interactions. Temperature sensitivity of CH4 increased with increasing thaw in bivariate analyses, but lack of this trend in multiple regression analyses suggested cofounding effects of substrate or water limitation on the apparent temperature sensitivity. Our results emphasize the importance of incorporating transitional stages of thaw in landscape level C budgets and highlight that end-member or adjacent thaw stages do not adequately describe the variability in structure-function relationships present along a thaw gradient.

Download Full-text

Environmental correlates of peatland carbon fluxes in a thawing landscape: do transitional thaw stages matter?

Biogeosciences ◽

10.5194/bg-12-3119-2015 ◽

2015 ◽

Vol 12 (10) ◽

pp. 3119-3130 ◽

Cited By ~ 14

Author(s):

A. Malhotra ◽

N. T. Roulet

Keyword(s):

Temperature Sensitivity ◽

Structural Changes ◽

Co2 Flux ◽

Apparent Temperature ◽

Ecosystem Structure ◽

Environmental Correlates ◽

C Storage ◽

Discontinuous Permafrost ◽

Significant Area ◽

And Function

Abstract. Peatlands in discontinuous permafrost regions occur as a mosaic of wetland types, each with variable sensitivity to climate change. Permafrost thaw further increases the spatial heterogeneity in ecosystem structure and function in peatlands. Carbon (C) fluxes are well characterized in end-member thaw stages such as fully intact or fully thawed permafrost but remain unconstrained for transitional stages that cover a significant area of thawing peatlands. Furthermore, changes in the environmental correlates of C fluxes, due to thaw, are not well described – a requirement for modeling future changes to C storage of permafrost peatlands. We investigated C fluxes and their correlates in end-member and a number of transitional thaw stages in a sub-arctic peatland. Across peatland-lumped CH4 and CO2 flux data had significant correlations with expected correlates such as water table depth, thaw depth, temperature, photosynthetically active radiation and vascular green area. Within individual thaw states, bivariate correlations as well as multiple regressions between C flux and environmental factors changed variably with increasing thaw. The variability in directions and magnitudes of correlates reflects the range of structural conditions that could be present along a thaw gradient. These structural changes correspond to changes in C flux controls, such as temperature and moisture, and their interactions. Temperature sensitivity of CH4 increased with increasing thaw in bivariate analyses, but lack of this trend in multiple regression analyses suggested cofounding effects of substrate or water limitation on the apparent temperature sensitivity. Our results emphasize the importance of incorporating transitional stages of thaw in landscape level C budgets and highlight that end-member or adjacent thaw stages do not adequately describe the variability in structure-function relationships present along a thaw gradient.

Download Full-text

Soil moisture influenced the interannual variation in temperature sensitivity of soil organic carbon mineralization in the Loess Plateau

Biogeosciences Discussions ◽

10.5194/bgd-12-1453-2015 ◽

2015 ◽

Vol 12 (2) ◽

pp. 1453-1474 ◽

Cited By ~ 1

Author(s):

Y. Zhang ◽

S. Guo ◽

M. Zhao ◽

L. Du ◽

R. Li ◽

...

Keyword(s):

Soil Moisture ◽

Carbon Cycle ◽

Loess Plateau ◽

Temperature Sensitivity ◽

Interannual Variation ◽

Carbon Mineralization ◽

Co2 Flux ◽

The Loess Plateau ◽

Local Soil ◽

Soc Mineralization

Abstract. Temperature sensitivity of SOC mineralization (Q10) determines how strong the feedback from global warming may be on the atmospheric CO2 concentration, thus understanding the factors influencing the interannual variation in Q10 is important to accurately estimate the local soil carbon cycle. In situ SOC mineralization was measured using an automated CO2 flux system (Li-8100) in long-term bare fallow soil in the Loess Plateau (35° 12' N, 107° 40' E) in Changwu, Shaanxi, China form 2008 to 2013. The results showed that the annual cumulative SOC mineralization ranged from 226 to 298 g C m−2 y−1 (mean =253 g C m−2 y−1; CV =13%), annual Q10 ranged from 1.48 to 1.94 (mean =1.70; CV =10%), and annual soil moisture content ranged from 38.6 to 50.7% WFPS (mean =43.8% WFPS; CV =11%), which were mainly affected by the frequency and distribution of precipitation. Annual Q10 showed a negative quadratic correlation with soil moisture. In conclusion, understanding of the relationships between interannual variation in Q10 of SOC mineralization, soil moisture and precipitation is important to accurately estimate the local carbon cycle, especially under the changing climate.

Download Full-text

Temperature Sensitivity of CO2 and CH4 Fluxes from Coarse Woody Debris in Northern Boreal Forests

Forests ◽

10.3390/f12050624 ◽

2021 ◽

Vol 12 (5) ◽

pp. 624

Author(s):

Liudmila Mukhortova ◽

Natalia Pashenova ◽

Maria Meteleva ◽

Leonid Krivobokov ◽

Georg Guggenberger

Keyword(s):

Temperature Sensitivity ◽

Coarse Woody Debris ◽

Boreal Forests ◽

Woody Debris ◽

Co2 Flux ◽

Methane Flux ◽

Main Process ◽

Strong Positive Correlation ◽

Biological Source ◽

Higher Temperature

Carbon dioxide (CO2) and methane (CH4) are recognized as the main greenhouse gases causing climate warming. In forest ecosystems, the death of trees leads to the formation of coarse woody debris (CWD) that is one of the sources of greenhouse gas emissions due to wood decomposition. We quantified the CO2 and CH4 fluxes from CWD of larch (Larix gmelinii (Rupr.)) and birch (Betula tortuosa Ledeb.) collected in the northern boreal forests of Central Siberia. The CWD samples were incubated at +5, +15 and +25 °C. The CO2 and CH4 fluxes showed strong correlations with temperature, moisture, decomposition stage and the type of wood’s rot. The temperature coefficient Q10 indicated higher temperature sensitivity of CO2 flux within the temperature interval from +5 to +15 °C than from +15 to +25 °C. Methane flux had higher temperature sensitivity within the interval from +15 to +25 °C. It was found that, in boreal forests, CWD of early decay stage can serve as a source of methane to the atmosphere when air temperatures increased above +15 °C. Strong positive correlation between CH4 production and CO2 emission indicated a biological source and supported findings on aerobic origin of the main process contributing to the CH4 flux from decomposing CWD.

Download Full-text