Abstract
Human activities enhance the atmospheric CO 2 concentration and modify climatic patterns, which could change the growth and quality of plant materials, as well as their subsequent decomposition, thus altering stream ecosystem functioning. These effects could be modulated by interactions between plant species differing in biological traits and competitive capacity. We cultivated the forb Trifolium pratense and the grass Agrostis capillaris under different CO 2 concentration (ambient or elevated), water availability (control or drought), and competition (monoculture or mixture). The material thus grown was conditioned in a stream for microbial colonization, and its subsequent decomposition was measured in laboratory microcosms. Elevated CO 2 reduced the quality of T. pratense but not that of A. capillaris. Water shortage limited plant quality but did not interact with CO 2 concentration. Interspecific competition only affected nitrogen concentration in A. capillaris. Elevated CO 2 did not affect decomposition rate, and A. capillaris, the species richer in nutrients, decomposed more slowly. Our results showed that the decomposition rates of plant materials grown under elevated CO 2 are difficult to predict due to species-specific responses and interactions with other factors.
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Claims 7
Claim · model-written summary
Elevated CO2 reduced the quality of Trifolium pratense relative to ambient CO2.
- Taxon
- T. pratense
Trifolium pratensee0 - Treatment
- Elevated CO 2e0
- Outcome
- qualitye0
- Direction
- reducede0
- Comparator
- ambiente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO 2 reduced the quality of T. pratense but not that of A. capillaris”
e1“different CO 2 concentration (ambient or elevated)”
Claim · model-written summary
Elevated CO2 did not reduce the quality of Agrostis capillaris relative to ambient CO2.
- Taxon
- A. capillaris
Agrostis capillarise0 - Treatment
- Elevated CO 2e0
- Outcome
- qualitye0
- Direction
- no_changeinferrede0
- Comparator
- ambiente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO 2 reduced the quality of T. pratense but not that of A. capillaris”
e1“different CO 2 concentration (ambient or elevated)”
Claim · model-written summary
Water shortage (drought) limited plant quality compared with the control water availability.
- Taxon
- Trifolium pratense and the grass Agrostis capillarisTrifolium pratenseAgrostis capillarise2
- Treatment
- Water shortagee0
- Outcome
- plant qualitye0
- Direction
- limitede0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water shortage limited plant quality but did not interact with CO 2 concentration”
e1“water availability (control or drought)”
e2“the forb Trifolium pratense and the grass Agrostis capillaris”
Claim · model-written summary
Water shortage did not interact with CO2 concentration in its effect on plant quality.
- Taxon
- Trifolium pratense and the grass Agrostis capillarisTrifolium pratenseAgrostis capillarise2
- Treatment
- Water shortagee0
- Outcome
- interact with CO 2 concentratione0
- Direction
- no_changeinferrede0
- Comparator
- controle1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water shortage limited plant quality but did not interact with CO 2 concentration”
e1“water availability (control or drought)”
e2“the forb Trifolium pratense and the grass Agrostis capillaris”
Claim · model-written summary
Interspecific competition affected only the nitrogen concentration in Agrostis capillaris, compared with monoculture.
- Taxon
- A. capillarisAgrostis capillarise0
- Treatment
- Interspecific competitione0
- Outcome
- nitrogen concentratione0
- Comparator
- monoculturee1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Interspecific competition only affected nitrogen concentration in A. capillaris”
e1“competition (monoculture or mixture)”
Claim · model-written summary
Elevated CO2 did not affect the decomposition rate of the plant materials grown under it.
- Taxon
- Trifolium pratense and the grass Agrostis capillarisTrifolium pratenseAgrostis capillarise2
- Treatment
- Elevated CO 2e0
- Outcome
- decomposition ratee0
- Direction
- no_changeinferrede0
- Comparator
- ambiente1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Elevated CO 2 did not affect decomposition rate”
e1“different CO 2 concentration (ambient or elevated)”
e2“the forb Trifolium pratense and the grass Agrostis capillaris”
Claim · model-written summary
Agrostis capillaris, the species richer in nutrients, decomposed more slowly.
- Taxon
- A. capillarisAgrostis capillarise0
- Outcome
- decomposed more slowlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A. capillaris, the species richer in nutrients, decomposed more slowly”
The same questions in other papers
drought · molecular: metabolites · Trifolium pratense (red clover)Positive and negative results
1 in the opposite direction
- positive
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.