Limits...
Nematodes enhance plant growth and nutrient uptake under C and N-rich conditions

View Article: PubMed Central - PubMed

ABSTRACT

The role of soil fauna in crucial ecosystem services such as nutrient cycling remains poorly quantified, mainly because of the overly reductionistic approach adopted in most experimental studies. Given that increasing nitrogen inputs in various ecosystems influence the structure and functioning of soil microbes and the activity of fauna, we aimed to quantify the role of the entire soil nematode community in nutrient mineralization in an experimental set-up emulating nutrient-rich field conditions and accounting for crucial interactions amongst the soil microbial communities and plants. To this end, we reconstructed a complex soil foodweb in mesocosms that comprised largely undisturbed native microflora and the entire nematode community added into defaunated soil, planted with Lolium perenne as a model plant, and amended with fresh grass-clover residues. We determined N and P availability and plant uptake, plant biomass and abundance and structure of the microbial and nematode communities during a three-month incubation. The presence of nematodes significantly increased plant biomass production (+9%), net N (+25%) and net P (+23%) availability compared to their absence, demonstrating that nematodes link below- and above-ground processes, primarily through increasing nutrient availability. The experimental set-up presented allows to realistically quantify the crucial ecosystem services provided by the soil biota.

No MeSH data available.


Related in: MedlinePlus

The evolution of dry biomass which is the sum of both the shoot and root biomass (a), and total nutrient mineralization (sum of available nutrients in the soil and plant uptake at each sampling occasion) for Nitrogen (μg N g−1 soil), (b) and Phosphorus (μg P g−1 soil), (c) in +Nem and −Nem treatments.The error bars indicate the standard error of the mean (n = 4).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5015107&req=5

f3: The evolution of dry biomass which is the sum of both the shoot and root biomass (a), and total nutrient mineralization (sum of available nutrients in the soil and plant uptake at each sampling occasion) for Nitrogen (μg N g−1 soil), (b) and Phosphorus (μg P g−1 soil), (c) in +Nem and −Nem treatments.The error bars indicate the standard error of the mean (n = 4).

Mentions: Total dry biomass (root and shoot dry weight) was higher in +Nem than −Nem samples throughout the incubation (Fig. 3a) with significantly higher differences on day 47 (+21%, p = 0.002) and day 105 (+15%, p = 0.000). Nitrogen and phosphorus uptake was significantly higher in +Nem than in −Nem treatment with overall mean differences of +6% (p = 0.003) and +10% (p = 0.002), respectively (Table 1).


Nematodes enhance plant growth and nutrient uptake under C and N-rich conditions
The evolution of dry biomass which is the sum of both the shoot and root biomass (a), and total nutrient mineralization (sum of available nutrients in the soil and plant uptake at each sampling occasion) for Nitrogen (μg N g−1 soil), (b) and Phosphorus (μg P g−1 soil), (c) in +Nem and −Nem treatments.The error bars indicate the standard error of the mean (n = 4).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5015107&req=5

f3: The evolution of dry biomass which is the sum of both the shoot and root biomass (a), and total nutrient mineralization (sum of available nutrients in the soil and plant uptake at each sampling occasion) for Nitrogen (μg N g−1 soil), (b) and Phosphorus (μg P g−1 soil), (c) in +Nem and −Nem treatments.The error bars indicate the standard error of the mean (n = 4).
Mentions: Total dry biomass (root and shoot dry weight) was higher in +Nem than −Nem samples throughout the incubation (Fig. 3a) with significantly higher differences on day 47 (+21%, p = 0.002) and day 105 (+15%, p = 0.000). Nitrogen and phosphorus uptake was significantly higher in +Nem than in −Nem treatment with overall mean differences of +6% (p = 0.003) and +10% (p = 0.002), respectively (Table 1).

View Article: PubMed Central - PubMed

ABSTRACT

The role of soil fauna in crucial ecosystem services such as nutrient cycling remains poorly quantified, mainly because of the overly reductionistic approach adopted in most experimental studies. Given that increasing nitrogen inputs in various ecosystems influence the structure and functioning of soil microbes and the activity of fauna, we aimed to quantify the role of the entire soil nematode community in nutrient mineralization in an experimental set-up emulating nutrient-rich field conditions and accounting for crucial interactions amongst the soil microbial communities and plants. To this end, we reconstructed a complex soil foodweb in mesocosms that comprised largely undisturbed native microflora and the entire nematode community added into defaunated soil, planted with Lolium perenne as a model plant, and amended with fresh grass-clover residues. We determined N and P availability and plant uptake, plant biomass and abundance and structure of the microbial and nematode communities during a three-month incubation. The presence of nematodes significantly increased plant biomass production (+9%), net N (+25%) and net P (+23%) availability compared to their absence, demonstrating that nematodes link below- and above-ground processes, primarily through increasing nutrient availability. The experimental set-up presented allows to realistically quantify the crucial ecosystem services provided by the soil biota.

No MeSH data available.


Related in: MedlinePlus