Abstract
In order to achieve sustainable economic and environmental development in China, CO2-emission reduction and phytoremediation of polluted soil must be resolved. According to the effect of biological carbon sequestration on rhizosphere microenvironment, we propose that phytoremediation of polluted soil can be enhanced by CO2 fertilization, and hope to provide information for resolving dilemma of CO2-emission reduction and phytoremediation technology. In this study, effects of CO2 fertilization on cypermethrin reduction in rhizosphere of C3-plant (bush bean) and C4-plant (maize) were investigated. Results showed that dry weight of shoot and root of bush bean (C3 plant) was increased by CO2 fertilization. Relative to ambient CO2, dry weight of root was increased by 54.3%, 31.9% and 30.0% in soil added with 0, 20 and 40 mg x kg(-1) cypermethrin respectively. Microbial biomass was increased by CO2 fertilization in rhizosphere soil added with 0 mg x kg(-1) cypermethrin, but negative effect was found in rhizosphere soil added with 20 and 40 mg x kg(-1) cypermethrin. CO2 fertilization slightly affected residual concentration of cypermethrin in rhizosphere soil added with 0 mg x kg(-1) cypermethrin, but significantly decreased residual concentration of cypermethrin as 24.0% and 16.9% in soil added with 20 and 40 mg x kg(-1) relative to ambient CO2. In maize plant, however, plant growth, microbial biomass and residual cypermethrin concentration in rhizosphere was slightly affected by CO2 fertilization, and even negative effect was observed. This study indicated that CO2 fertilization decreases the residual concentration of cypermethrin in rhizosphere of C3-plant, and it is possible to enhance phytoremediation of organic-polluted soil by C3-plant through CO2 fertilization. However, further study is needed for C4-plant.
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Claims 14
Claim · model-written summary
CO2 fertilization increased bush bean shoot dry weight.
Not reportedComparator
Verbatim
e0“dry weight of shoot and root of bush bean (C3 plant) was increased by CO2 fertilization”
Claim · model-written summary
CO2 fertilization increased bush bean root dry weight by 54.3% with no added cypermethrin relative to ambient CO2.
Verbatim
e0“Relative to ambient CO2, dry weight of root was increased by 54.3%, 31.9% and 30.0% in soil added with 0, 20 and 40 mg x kg(-1) cypermethrin respectively”
e1“bush bean (C3 plant)”
e2“dry weight of shoot and root of bush bean (C3 plant) was increased by CO2 fertilization”
Claim · model-written summary
CO2 fertilization increased bush bean root dry weight by 31.9% with 20 mg x kg(-1) cypermethrin.
Verbatim
e0“Relative to ambient CO2, dry weight of root was increased by 54.3%, 31.9% and 30.0% in soil added with 0, 20 and 40 mg x kg(-1) cypermethrin respectively”
e1“bush bean (C3 plant)”
e2“dry weight of shoot and root of bush bean (C3 plant) was increased by CO2 fertilization”
Claim · model-written summary
CO2 fertilization increased bush bean root dry weight by 30.0% with 40 mg x kg(-1) cypermethrin.
Verbatim
e0“Relative to ambient CO2, dry weight of root was increased by 54.3%, 31.9% and 30.0% in soil added with 0, 20 and 40 mg x kg(-1) cypermethrin respectively”
e1“bush bean (C3 plant)”
e2“dry weight of shoot and root of bush bean (C3 plant) was increased by CO2 fertilization”
Claim · model-written summary
CO2 fertilization increased microbial biomass in bush bean rhizosphere soil without added cypermethrin.
- Taxon
- bush beane1
- Treatment
- CO2 fertilizatione0
- Outcome
- Microbial biomasse0
- Direction
- increasede0
- Qualifier
- 0 mg x kg(-1) cypermethrine0
Not reportedComparator
Verbatim
e0“Microbial biomass was increased by CO2 fertilization in rhizosphere soil added with 0 mg x kg(-1) cypermethrin”
e1“bush bean (C3 plant)”
Claim · model-written summary
CO2 fertilization negatively affected microbial biomass in bush bean rhizosphere soil with 20 mg x kg(-1) cypermethrin.
- Taxon
- bush beane2
- Treatment
- CO2 fertilizatione1
- Outcome
- Microbial biomasse1
- Direction
- negative effecte0
- Qualifier
- 20e0
Not reportedComparator
Verbatim
e0“negative effect was found in rhizosphere soil added with 20 and 40 mg x kg(-1) cypermethrin”
e1“Microbial biomass was increased by CO2 fertilization”
e2“bush bean (C3 plant)”
Claim · model-written summary
CO2 fertilization negatively affected microbial biomass in bush bean rhizosphere soil with 40 mg x kg(-1) cypermethrin.
- Taxon
- bush beane2
- Treatment
- CO2 fertilizatione1
- Outcome
- Microbial biomasse1
- Direction
- negative effecte0
- Qualifier
- 40 mg x kg(-1) cypermethrine0
Not reportedComparator
Verbatim
e0“negative effect was found in rhizosphere soil added with 20 and 40 mg x kg(-1) cypermethrin”
e1“Microbial biomass was increased by CO2 fertilization”
e2“bush bean (C3 plant)”
Claim · model-written summary
CO2 fertilization slightly affected residual cypermethrin in bush bean rhizosphere soil with no added cypermethrin.
- Taxon
- bush beane1
- Treatment
- CO2 fertilizatione0
- Outcome
- residual concentration of cypermethrine0
- Qualifier
- 0 mg x kg(-1) cypermethrine0
Not reportedComparatorDirection
Verbatim
e0“CO2 fertilization slightly affected residual concentration of cypermethrin in rhizosphere soil added with 0 mg x kg(-1) cypermethrin”
e1“bush bean (C3 plant)”
Claim · model-written summary
CO2 fertilization decreased residual cypermethrin by 24.0% in bush bean rhizosphere soil with 20 mg x kg(-1) cypermethrin.
Verbatim
e0“significantly decreased residual concentration of cypermethrin as 24.0% and 16.9% in soil added with 20 and 40 mg x kg(-1) relative to ambient CO2”
e1“bush bean (C3 plant)”
e2“CO2 fertilization slightly affected residual concentration”
Claim · model-written summary
CO2 fertilization decreased residual cypermethrin by 16.9% in bush bean rhizosphere soil with 40 mg x kg(-1) cypermethrin.
Verbatim
e0“significantly decreased residual concentration of cypermethrin as 24.0% and 16.9% in soil added with 20 and 40 mg x kg(-1) relative to ambient CO2”
e1“bush bean (C3 plant)”
e2“CO2 fertilization slightly affected residual concentration”
Claim · model-written summary
CO2 fertilization slightly or negatively affected maize growth.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In maize plant, however, plant growth, microbial biomass and residual cypermethrin concentration in rhizosphere was slightly affected by CO2 fertilization, and even negative effect was observed”
Claim · model-written summary
CO2 fertilization slightly or negatively affected maize rhizosphere microbial biomass.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In maize plant, however, plant growth, microbial biomass and residual cypermethrin concentration in rhizosphere was slightly affected by CO2 fertilization, and even negative effect was observed”
Claim · model-written summary
CO2 fertilization slightly or negatively affected residual cypermethrin in maize rhizosphere.
- Treatment
- CO2 fertilizatione0
- Outcome
- residual cypermethrin concentration in rhizospheree0
- Direction
- negative effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In maize plant, however, plant growth, microbial biomass and residual cypermethrin concentration in rhizosphere was slightly affected by CO2 fertilization, and even negative effect was observed”
Claim · model-written summary
The authors suggest CO2 fertilization may enhance phytoremediation by C3 plants.
Verbatim
e0“it is possible to enhance phytoremediation of organic-polluted soil by C3-plant through CO2 fertilization”
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See all 90 papers →8 of 12 groups shown: named compounds and organisms first, then groups whose results differ (checked claim by claim), then those with positive and negative results, then the smaller groups.
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.