scholarly journals Response of AM fungi spore population to elevated temperature and nitrogen addition and their influence on the plant community composition and productivity

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Tao Zhang ◽  
Xue Yang ◽  
Rui Guo ◽  
Jixun Guo
Keyword(s):  
Elevated Temperature ◽  
Community Composition ◽  
Plant Community ◽  
Am Fungi ◽  
Nitrogen Addition ◽  
Plant Community Composition ◽  
Spore Population

The effect of long-term nutrient deficiency on the abundance and community composition of arbuscular mycorrhizal fungi in a mountainous grassland

2021 ◽  
Author(s):  
Kian Jenab ◽  
Stefan Gorka ◽  
Sean Darcy ◽  
Lucia Fuchslueger ◽  
Alberto Canarini ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Community Composition ◽  
Plant Community ◽  
Fungal Biomass ◽  
Nutrient Deficiency ◽  
Soil Nutrient ◽  
Am Fungi ◽  
Fungal Communities ◽  
Plant Community Composition

<p>Arbuscular mycorrhiza (AM) fungi are associated with almost all land plants and provide soil nutrients and other benefits to their plant hosts in exchange for photosynthetic products. While fertilization regimes in managed grasslands or agricultural systems are tailored for increasing plant biomass, their potential effects on AM fungi are rarely taken into account. Nutrient-driven changes in abundance and community composition of AM fungi, however, may feedback on ecosystem performance in the long term. Therefore, it is necessary to get a better understanding on how AM fungal communities respond to changes and imbalances in soil nutrient availabilities.</p><p>Here, we evaluated how long-term nutrient deficiency of phosphorus (P), nitrogen (N) and potassium (K) affects the abundance and community composition of AM fungi in a mountainous grassland. In addition, we investigated how the responses of AM fungi to those deficiencies were modulated by liming and the type of fertilizer addition (inorganic versus organic).</p><p>Our study was carried out on a long-term nutrient deficiency experimental grassland site in Admont (Styria, Austria), established in 1946. Different fertilization treatments were applied for more than 70 years in a randomized block design, including numerous combinations of inorganic (P, N, K with/without lime) and organic (solid manure and liquid slurry) fertilizers. The hay meadow at the site is cut three times per year and biomass is not returned to the system. Therefore, biomass and nutrients have been continuously removed for decades, leading to different types of soil nutrient deficiency. In this study, we collected both root and soil samples in July 2019 and quantified AM fungi and other microbial groups by measuring neutral fatty acid (NLFA) and phospholipid fatty acid (PLFA) biomarkers, respectively. Additionally, we applied DNA and RNA-based amplicon sequencing of the 18S rRNA gene to identify AM fungal community composition.</p><p>Our data shows that deficiencies of one or more elements had a major impact on both AM fungal biomass and community composition. AM fungal biomass was higher in plots that received no fertilizers compared to inorganically fertilized plots, but lower in plots which were deficient only in certain single or multiple elements, specifically in plots fertilized with inorganic N only (i.e., deficient in P and K). Conversely, liming and organic fertilizer amendments increased AM fungal biomass compared to plots containing inorganic fertilizers without lime. Across all treatments, AM fungal biomass was positively correlated with pH and soil water content, and negatively with dissolved N compounds, indicating indirect effects via responses of other soil parameters to nutrient deficiency. Long-term nutrient deficiency also altered plant community composition, which may also have indirectly affected AM fungal communities.</p><p>We conclude that long-term nutrient deficiency, and in particular the stoichiometry of available nutrients, strongly affects the abundance and community composition of AM fungi in grassland soil. This response may be linked to changes in plant community composition or soil chemistry both as a result and as a cause, emphasizing the complexity of feedbacks determining the response of grassland ecosystems to changing nutrient conditions.</p>

scholarly journals Shifts in plant community composition weaken the negative effect of nitrogen addition on community-level arbuscular mycorrhizal fungi colonization

2020 ◽  
Vol 287 (1927) ◽  
pp. 20200483
Author(s):  
Yawen Lu ◽  
Xiang Liu ◽  
Fei Chen ◽  
Shurong Zhou
Keyword(s):  
Community Composition ◽  
Plant Species ◽  
Plant Community ◽  
Direct Effect ◽  
Indirect Effect ◽  
Mycorrhizal Fungi ◽  
Nitrogen Addition ◽  
Community Level ◽  
Colonization Rate ◽  
Plant Community Composition

Nitrogen addition affects plant–arbuscular mycorrhizal fungi (AMF) association greatly. However, although the direct effect of nitrogen addition on AMF colonization has received investigation, its indirect effect through shifts in plant community composition has never been quantified. Based on a 7-year nitrogen addition experiment in an alpine meadow of Qinghai–Tibet Plateau, we investigated the effects of nitrogen addition on plant community, AMF diversity and colonization, and disentangled the direct and indirect effects of nitrogen addition on community AMF colonization. At plant species level, nitrogen addition significantly decreased root colonization rate and altered AMF community composition, but with no significant effect on AMF richness. At plant community level, plant species richness and AMF colonization rate decreased with nitrogen addition. Plant species increasing in abundance after nitrogen addition were those with higher AMF colonization rates in natural conditions, resulting in an increased indirect effect induced by alternation in plant community composition with nitrogen addition, whereas the direct effect was negative and decreased with nitrogen addition. Overall, we illustrate the effect of nitrogen addition and plant species in influencing the AMF diversity, demonstrate how shifts in plant community composition (indirect effect) weaken the negative direct effect of nitrogen addition on community-level AMF colonization rate, and emphasize the importance of plant community-mediated mechanisms in regulating ecosystem functions.

Role of soil biotic and abiotic properties in plant community composition in response to nitrogen addition

2022 ◽  
Author(s):  
Qing Qu ◽  
Minggang Wang ◽  
Hongwei Xu ◽  
Ziran Yan ◽  
Guobin Liu ◽  
...  
Keyword(s):  
Community Composition ◽  
Plant Community ◽  
Nitrogen Addition ◽  
Plant Community Composition

scholarly journals Incorporation of mineral nitrogen into the soil food web as affected by plant community composition

2021 ◽  
Author(s):  
Tanja Strecker ◽  
Annette Jesch ◽  
Dörte Bachmann ◽  
Melissa Jüds ◽  
Kevin Karbstein ◽  
...  
Keyword(s):  
Food Web ◽  
Community Composition ◽  
Plant Community ◽  
Mineral Nitrogen ◽  
Plant Community Composition ◽  
Soil Food Web
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