Abstract
A study was conducted to quantify the effect of elevated carbon dioxide (CO2) and temperature on soil organic nitrogen (N) fractions and enzyme activities in rice rhizosphere. Rice crop was grown inside the open top chambers in the ICAR-Indian Agricultural Research Institute. The N was applied in four different doses. Grain yield and aboveground N uptake by rice significantly reduced under elevated temperature. However, elevated CO2 along with elevated temperature was able to compensate this loss. Principal component analysis clearly indicated that microbial biomass carbon, microbial biomass N, amino acid N, total hydrolysable N, ammonia N and serine–threonine N contributed significantly to rice grain yield. Combined effect of elevated CO2 and elevated temperature decreased the total hydrolysable N, especially for lower N doses. The N-acetyl-glucosaminidase and leucine aminopeptidase enzyme activities were negatively correlated with the organic N pools. Higher activities of these enzymes under limited N supply may accelerate the decomposition of organic N in soil. When N was applied in super-optimal dose, plant N demand was met thereby causing lesser depletion of total hydrolysable N. Better nitrogen management will alleviate faster depletion of native soil N under future scenario of climate change and thus might cause N sequestration in soil.
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Claims 10
Claim · model-written summary
Elevated temperature significantly reduced rice grain yield.
- Taxon
- rice
Oryza sativae0 - Treatment
- elevated temperaturee0
- Outcome
- Grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield and aboveground N uptake by rice significantly reduced under elevated temperature.”
Claim · model-written summary
Elevated temperature significantly reduced aboveground nitrogen uptake by rice.
- Taxon
- riceOryza sativae0
- Treatment
- elevated temperaturee0
- Outcome
- aboveground N uptakee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Grain yield and aboveground N uptake by rice significantly reduced under elevated temperature.”
Claim · model-written summary
Elevated CO2 with elevated temperature compensated the reported rice loss.
- Taxon
- riceOryza sativat0
- Treatment
- elevated CO2 along with elevated temperaturee0
- Outcome
- this losse0
- Direction
- compensatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, elevated CO2 along with elevated temperature was able to compensate this loss.”
t0“rice crop”
Claim · model-written summary
Microbial biomass carbon, microbial biomass nitrogen and amino acid nitrogen contributed significantly to rice grain yield in principal component analysis.
- Taxon
- riceOryza sativae0
- Outcome
- rice grain yielde0
- Qualifier
- microbial biomass carbon, microbial biomass N, amino acid Ne0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Principal component analysis clearly indicated that microbial biomass carbon, microbial biomass N, amino acid N, total hydrolysable N, ammonia N and serine–threonine N contributed significantly to rice grain yield.”
Claim · model-written summary
Total hydrolysable nitrogen, ammonia nitrogen and serine–threonine nitrogen contributed significantly to rice grain yield.
- Taxon
- riceOryza sativat0
- Outcome
- rice grain yielde0
- Qualifier
- total hydrolysable N, ammonia N and serine–threonine Ne0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“total hydrolysable N, ammonia N and serine–threonine N contributed significantly to rice grain yield”
t0“rice crop”
Claim · model-written summary
Combined elevated CO2 and temperature decreased soil total hydrolysable nitrogen, especially at lower nitrogen doses.
- Taxon
- riceOryza sativat0
- Treatment
- elevated CO2 and elevated temperaturee0
- Outcome
- total hydrolysable Ne0
- Direction
- decreasede0
- Qualifier
- especially for lower N dosese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Combined effect of elevated CO2 and elevated temperature decreased the total hydrolysable N, especially for lower N doses.”
t0“rice crop”
Claim · model-written summary
N-acetyl-glucosaminidase and leucine aminopeptidase activities were negatively correlated with organic nitrogen pools.
- Taxon
- riceOryza sativat0
- Gene
- N-acetyl-glucosaminidase and leucine aminopeptidasee0
- Outcome
- organic N poolse0
- Direction
- negatively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N-acetyl-glucosaminidase and leucine aminopeptidase enzyme activities were negatively correlated with the organic N pools.”
t0“rice crop”
Claim · model-written summary
High enzyme activity under limited nitrogen supply may accelerate soil organic nitrogen decomposition.
- Taxon
- riceOryza sativat0
- Outcome
- decomposition of organic N in soile0
- Qualifier
- under limited N supplye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Higher activities of these enzymes under limited N supply may accelerate the decomposition of organic N in soil.”
t0“rice crop”
Claim · model-written summary
Super-optimal nitrogen application met plant demand and caused less depletion of soil total hydrolysable nitrogen.
- Taxon
- riceOryza sativat0
- Treatment
- N was applied in super-optimal dosee0
- Outcome
- total hydrolysable Ne0
- Direction
- lesser depletione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When N was applied in super-optimal dose, plant N demand was met thereby causing lesser depletion of total hydrolysable N.”
t0“rice crop”
Claim · model-written summary
Better nitrogen management may alleviate soil nitrogen depletion and promote soil nitrogen sequestration under future climate change.
- Taxon
- riceOryza sativat0
- Outcome
- Better nitrogen managemente0
- Qualifier
- under future scenario of climate changee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Better nitrogen management will alleviate faster depletion of native soil N under future scenario of climate change and thus might cause N sequestration in soil.”
t0“rice crop”
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