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 Rhizosphere bacterial community composition responds to arbuscular mycorrhiza, but not to reductions in microbial activity induced by foliar cutting

2008 ◽  
Vol 64 (1) ◽  
pp. 78-89 ◽  
Author(s):  
Mette VestergÃ¥rd ◽  
Frédéric Henry ◽  
Juan Ignacio Rangel-Castro ◽  
Anders Michelsen ◽  
James I. Prosser ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Arbuscular Mycorrhiza ◽  
Microbial Activity ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
Rhizosphere Bacterial Community

scholarly journals Agricultural Management Affects the Active Rhizosphere Bacterial Community Composition and Nitrification

mSystems ◽  
2021 ◽  
Author(s):  
Guillaume Bay ◽  
Conard Lee ◽  
Chiliang Chen ◽  
Navreet K. Mahal ◽  
Michael J. Castellano ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Bacterial Community ◽  
Community Composition ◽  
Inorganic Nitrogen ◽  
Bacterial Community Composition ◽  
Agricultural Management ◽  
N Fertilizer ◽  
Low Diversity ◽  
Rhizosphere Bacterial Community

Crops in simplified, low-diversity agroecosystems assimilate only a fraction of the inorganic nitrogen (N) fertilizer inputs. Much of this N fertilizer is lost to the environment as N oxides, which degrade water quality and contribute to climate change and loss of biodiversity.

scholarly journals Comparison of soil bacterial community and functional characteristics following afforestation in the semi-arid areas

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7141 ◽  
Author(s):  
Jiaojiao Deng ◽  
Yan Zhang ◽  
You Yin ◽  
Xu Zhu ◽  
Wenxu Zhu ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Soil Characteristics ◽  
N Cycling ◽  
Soil Bacterial Community ◽  
Arid Areas ◽  
Plantation Forests ◽  
C And N ◽  
Soil Bacterial ◽  
C And N Cycling ◽  
Semi Arid

Changes in soil bacterial communities, which are crucial for the assessment of ecological restoration in Chinese plantations, have never been studied in the “Three North Shelterbelt” project in the semi-arid areas. We used high-throughput sequencing of the 16S rDNA gene to investigate the soil bacterial community diversity, structure, and functional characteristics in three plantation forests, including Populus × canadensis Moench (PC), Pinus sylvestris var. mongolica (PS), and Pinus tabuliformis (PT). In addition, soil environment factors were measured. There were distinct differences in soil characteristics among different plantation forests. Compared to PS and PT, PC had a higher soil pH, dissolved organic carbon (DOC), and available P, as well as a lower C/N ratio. Furthermore, afforestation with different tree species significantly altered the abundance of Proteobacteria, and Chloroflexi in the soil, and its influence on the bacterial diversity indices. The bacterial community compositions and functional groups related to C and N cycling from PS, and PT were grouped tightly, indicating that the soil bacterial phylogenetic distance of PS and PT were closer than that between PS plus PT and PC. Our results implied that the soil characteristics, as well as the diversity, compositions and functions related to C and N cycling of soil bacterial community obviously differed from the following afforestation, especially between PC and PS plus PT, which in turn enormously established the correlation between the soil microbial community characteristics and the afforestation tree species.

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.

Rhizosphere bacterial community composition in natural stands of Carex arenaria (sand sedge) is determined by bulk soil community composition

2005 ◽  
Vol 37 (2) ◽  
pp. 349-357 ◽  
Author(s):  
Annelies S. de Ridder-Duine ◽  
George A. Kowalchuk ◽  
Paulien J.A. Klein Gunnewiek ◽  
Wiecher Smant ◽  
Johannes A. van Veen ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Community Composition ◽  
Bacterial Community Composition ◽  
Bulk Soil ◽  
Soil Community ◽  
Carex Arenaria ◽  
Rhizosphere Bacterial Community ◽  
Natural Stands
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