Iron and nitrogen cycling, bacterioplankton community composition and mineral transformations involving phosphorus stabilisation in the ferruginous hypolimnion of a post-mining lake

2018 ◽  
Vol 20 (10) ◽  
pp. 1414-1426
Author(s):  
Daniel A. Petrash ◽  
Jiří Jan ◽  
Dagmara Sirová ◽  
Nana O.-A. Osafo ◽  
Jakub Borovec
Keyword(s):  
Nitrogen Cycling ◽  
Community Composition ◽  
N Cycling ◽  
Oligotrophic Lake ◽  
Bacterioplankton Community ◽  
Mining Lake ◽  
Bottom Waters ◽  
C And N ◽  
C And N Cycling ◽  
Mineral Transformations

In the ferruginous and sulfate-rich bottom waters of the oligotrophic Lake Medard, P is bound to mineral clusters dominated by FeOOH polymorphs. Below the hypolimnion, Fe, C and N cycling seems largely controlled by Proteobacteria.

scholarly journals Nutrient recovery from anaerobic digestion of food waste: impacts of digestate on plant growth and rhizosphere bacterial community composition and potential function in ryegrass

2020 ◽  
Vol 56 (7) ◽  
pp. 973-989
Author(s):  
Ai-Tian Ren ◽  
Lynette K. Abbott ◽  
Yinglong Chen ◽  
You-Cai Xiong ◽  
Bede S. Mickan
Keyword(s):  
Bacterial Community ◽  
Ammonium Nitrate ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
N Cycling ◽  
Fungal Hyphae ◽  
Urea Ammonium Nitrate ◽  
C And N ◽  
Rhizosphere Bacterial Community ◽  
C And N Cycling

Abstract Global food wastage equates to about 1.3 billion tons per year, which causes serious environmental impacts. The objective of this study was to evaluate the influences of addition of digestate from food waste in comparison to a synthetic liquid urea ammonium nitrate solution on plant growth, rhizosphere bacterial community composition and diversity, and hyphal abundance of arbuscular mycorrhizal (AM) fungi. Plant and soil samples were collected at 25, 50, and 75 days after seedling emergence. Annual ryegrass growth was significantly increased by both liquid urea ammonium nitrate and digestate, and digestate was just as effective as liquid urea ammonium nitrate. Additionally, digestate (50 kg N ha−1) significantly increased AM fungal hyphae density. Liquid urea ammonium nitrate (50 kg N ha−1) significantly decreased AM fungal hyphae density compared with liquid urea ammonium nitrate (25 kg N ha−1) at DAE 75. Digestate and liquid urea ammonium nitrate applications significantly shifted the bacterial community composition and OTU richness and changed the abundance of microbial C and N-cycling genes, while application rates had no significant effect. Structural equation modeling showed that digestate and UAN addition both directly and indirectly affected bacterial, C and N cycling genes community composition; the indirect effects were related to increased soil NO3− content and reduced pH. This study showed that the use of digestate as a soil amendment can be environmentally effective and can provide a sustainable supply of nutrients that increases soil organic C. Moreover, the use of digestate can readily be incorporated into agricultural practices with potentially less impact on soil microflora diversity and function than conventional fertilizers.

scholarly journals Decelerated carbon cycling by ectomycorrhizal fungi is controlled by substrate quality and community composition

2019 ◽  
Author(s):  
Christopher W. Fernandez ◽  
Craig R. See ◽  
Peter G. Kennedy
Keyword(s):  
Leaf Litter ◽  
Community Composition ◽  
Litter Decomposition ◽  
Fungal Community ◽  
Decay Rates ◽  
N Cycling ◽  
Substrate Quality ◽  
Litter Decay ◽  
C And N ◽  
C And N Cycling

AbstractInteractions between symbiotic ectomycorrhizal (EM) and free-living saprotrophs can result in significant deceleration of leaf litter decomposition. While this phenomenon is widely cited, its generality remains unclear, as both the direction and magnitude of EM fungal effects on leaf litter decomposition have been shown to vary among studies. Here we explicitly examine how contrasting leaf litter types and EM fungal communities may lead to differential effects on C and N cycling. Specifically, we measured the response of soil nutrient cycling, litter decay rates, litter chemistry and fungal community structure to the reduction of EM fungi (via trenching) with a reciprocal litter transplant experiment in adjacent Pinus- or Quercus-dominated sites. We found clear evidence of EM fungal suppression of C and N cycling in the Pinus-dominated site, but no suppression in the Quercus-dominated site. Additionally, in the Pinus-dominated site, only the Pinus litter decay rates were decelerated by EM fungi and were associated with decoupling of litter C and N cycling. Our results support the hypothesis that EM fungi can decelerate C cycling via N competition, but strongly suggest that the ‘Gadgil effect’ is dependent on both substrate quality and EM fungal community composition. We argue that understanding tree host traits as well as EM fungal functional diversity is critical to a more mechanistic understanding of how EM fungi mediate forest soil biogeochemical cycling.

Clomazone improves the interactions between soil microbes and affects C and N cycling functions

2021 ◽  
Vol 770 ◽  
pp. 144730
Author(s):  
Lili Rong ◽  
Xiaohu Wu ◽  
Jun Xu ◽  
Fengshou Dong ◽  
Xingang Liu ◽  
...  
Keyword(s):  
Soil Microbes ◽  
N Cycling ◽  
C And N ◽  
C And N Cycling

Variations of belowground C and N cycling between arbuscular mycorrhizal and ectomycorrhizal forests across China

Soil Research ◽  
2020 ◽  
Vol 58 (5) ◽  
pp. 441 ◽  
Author(s):  
Jiwei Li ◽  
Zhouping Shangguan ◽  
Lei Deng
Keyword(s):  
Soil Respiration ◽  
Forest Ecosystems ◽  
Arbuscular Mycorrhizal ◽  
N Cycling ◽  
Microbial Biomass C ◽  
N Cycle ◽  
Positive Effects ◽  
Litter Input ◽  
C And N ◽  
C And N Cycling

Forests associating with arbuscular mycorrhizal (AM) and ectomycorrhizal (ECM) fungi may have distinct belowground carbon (C) and nitrogen (N) cycle processes. However, there are little available data providing evidence for the effects of trees associating with mycorrhizal type on belowground C and N cycling in forest ecosystems in China. Here, we collected a database of 26 variables related to belowground C and N cycling from 207 studies covering 209 sampling sites in China, to better understand the variations in belowground C and N cycling between the two mycorrhizal types in forest ecosystems along a climatic gradient. The AM forests had significantly lower soil total C and N contents, and soil microbial biomass C and N, than ECM forests, probably due to differences in litter quality (N and C/N) between AM and ECM forest types. In contrast, AM forests had significantly higher litter input, litter decomposition and soil respiration than ECM forests. Temperature and precipitation had significant positive effects on litter input and decomposition, soil total C and N contents, and soil respiration in AM and ECM forests. Overall, our results indicated that mycorrhizal type strongly affected belowground C and N cycle processes in forest ecosystems. Moreover, AM forests are likely more sensitive and ECM forests have a greater ability to adapt to global climate change.

Effects of Biochar on Pulse C and N Cycling After a Short-term Drought: a Laboratory Study

2021 ◽  
Author(s):  
Nadine Citerne ◽  
Helen M. Wallace ◽  
Tom Lewis ◽  
Frédérique Reverchon ◽  
Negar Omidvar ◽  
...  
Keyword(s):  
Laboratory Study ◽  
N Cycling ◽  
Short Term ◽  
C And N ◽  
C And N Cycling

Isotopic evidence for seasonal and long-term C and N cycling in a subtropical basin of southern China

2019 ◽  
Vol 577 ◽  
pp. 123926 ◽  
Author(s):  
Yingxue Xuan ◽  
Changyuan Tang ◽  
Yingjie Cao ◽  
Rui Li ◽  
Tao Jiang
Keyword(s):  
Southern China ◽  
N Cycling ◽  
Isotopic Evidence ◽  
C And N ◽  
C And N Cycling
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