Abstract
Abstract. Large-scale deployment of bioenergy plantations would have adverse effects on water resources. There is an increasing need to ensure the appropriate inclusion of the bioenergy crops in global hydrological models. Here, through parameter calibration and algorithm improvement, we enhanced the global hydrological model H08 to simulate the bioenergy yield from two dedicated herbaceous bioenergy crops: Miscanthus and switchgrass. Site-specific evaluations showed that the enhanced model had the ability to simulate yield for both Miscanthus and switchgrass, with the calibrated yields being well within the ranges of the observed yield. Independent country-specific evaluations further confirmed the performance of the H08 (v.bio1). Using this improved model, we found that unconstrained irrigation more than doubled the yield under rainfed condition, but reduced the water use efficiency (WUE) by 32 % globally. With irrigation, the yield in dry climate zones can exceed the rainfed yields in tropical climate zones. Nevertheless, due to the low water consumption in tropical areas, the highest WUE was found in tropical climate zones, regardless of whether the crop was irrigated. Our enhanced model provides a new tool for the future assessment of bioenergy–water tradeoffs.
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Claims 7
Claim · model-written summary
Enhanced H08 simulated Miscanthus yield within observed ranges.
- Taxon
- Miscanthus
Miscanthuse0 - Outcome
- simulate yielde0
- Comparator
- observed yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Site-specific evaluations showed that the enhanced model had the ability to simulate yield for both Miscanthus and switchgrass, with the calibrated yields being well within the ranges of the observed yield.”
Claim · model-written summary
Enhanced H08 simulated switchgrass yield within observed ranges.
- Taxon
- switchgrass
Panicum virgatume0 - Outcome
- simulate yielde0
- Comparator
- observed yielde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Site-specific evaluations showed that the enhanced model had the ability to simulate yield for both Miscanthus and switchgrass, with the calibrated yields being well within the ranges of the observed yield.”
Claim · model-written summary
Country-specific evaluations confirmed H08 performance.
Verbatim
e0“Independent country-specific evaluations further confirmed the performance of the H08 (v.bio1).”
Claim · model-written summary
Unconstrained irrigation more than doubled simulated yield relative to rainfed conditions.
- Taxon
- Miscanthus and switchgrassPanicum virgatumMiscanthuse1
- Treatment
- unconstrained irrigatione0
- Outcome
- yielde0
- Direction
- more than doublede0
- Comparator
- rainfed conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“unconstrained irrigation more than doubled the yield under rainfed condition”
e1“two dedicated herbaceous bioenergy crops: Miscanthus and switchgrass”
Claim · model-written summary
Unconstrained irrigation reduced simulated global water use efficiency by 32 %.
- Taxon
- Miscanthus and switchgrassPanicum virgatumMiscanthuse1
- Treatment
- unconstrained irrigatione0
- Outcome
- water use efficiency (WUE)e0
- Direction
- reducede0
- Value
- 32 %e0
- Comparator
- rainfed conditione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“unconstrained irrigation more than doubled the yield under rainfed condition, but reduced the water use efficiency (WUE) by 32 % globally”
e1“two dedicated herbaceous bioenergy crops: Miscanthus and switchgrass”
Claim · model-written summary
Irrigated dry-zone yields can exceed rainfed tropical-zone yields.
- Taxon
- Miscanthus and switchgrassPanicum virgatumMiscanthuse1
- Treatment
- irrigatione0
- Outcome
- yield in dry climate zonese0
- Direction
- exceede0
- Comparator
- rainfed yields in tropical climate zonese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With irrigation, the yield in dry climate zones can exceed the rainfed yields in tropical climate zones.”
e1“two dedicated herbaceous bioenergy crops: Miscanthus and switchgrass”
Claim · model-written summary
Tropical climate zones had the highest simulated WUE regardless of irrigation.
- Taxon
- Miscanthus and switchgrassPanicum virgatumMiscanthuse1
- Outcome
- WUEe0
- Direction
- higheste0
- Setting
- tropical climate zonese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest WUE was found in tropical climate zones, regardless of whether the crop was irrigated”
e1“two dedicated herbaceous bioenergy crops: Miscanthus and switchgrass”
The same questions in other papers
irrigation · yield · Panicum virgatum (switchgrass)Results differ
5 papers in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
- positive
3 papers more in this group
See all 7 papers →irrigation · physiology: water · Panicum virgatum (switchgrass)Positive and negative results
1 in the opposite direction
- positive
irrigation · yield · Miscanthus (silver grass)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- 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.