Cultivar mixtures a meta-analysis of the effect of intraspecific diversity on crop yield

Extensive research has shown that greater plant community diversity leads to higher levels of productivity and other ecosystem services, and such increased diversity has been suggested as a way to improve yield and agricultural sustainability. Increasing intraspecific diversity with cultivar mixture...

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Vydané v:Ecological applications Ročník 28; číslo 1; s. 62 - 77
Hlavní autori: Reiss, Emily R., Drinkwater, Laurie E.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States UNKNOWN 01.01.2018
Predmet:
abiotic stress
agroecosystems
biodiversity–ecosystem function
Biomass
crop yield
cropping systems
Crops, Agricultural - genetics
Crops, Agricultural - growth & development
cultivars
ecological intensification
ecosystem services
environmental impact
environmental stress
food crops
Genetic Variation
meta-analysis
mixing
nutrient availability
plant communities
small grains
soil organic matter
stability
Stress, Physiological
sustainable agriculture
weather
yield
environmental stress
food crops
biodiversity-ecosystem function
yield
small grains
agroecosystems
stability
ecological intensification
ISSN:1051-0761, 1939-5582
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Shrnutí:Extensive research has shown that greater plant community diversity leads to higher levels of productivity and other ecosystem services, and such increased diversity has been suggested as a way to improve yield and agricultural sustainability. Increasing intraspecific diversity with cultivar mixtures is one way to increase diversity in agricultural systems. We examined the relationship between intraspecific diversity and yield in cultivar mixtures using a meta-analysis of 91 studies and >3,600 observations. Additionally, we investigated how environmental and management factors might influence this relationship, and if the yield stability of cultivar mixtures differed from that of monocultures. We found that the yield increased by 2.2% overall in cultivar mixtures relative to their monoculture components. Mixtures with more cultivars and those with more functional trait diversity showed higher relative yields. Under biotic stressors, such as disease pressure, and abiotic stressors, such as low levels of soil organic matter and nutrient availability, this diversity effect was stronger, resulting in higher relative yields. Finally, cultivar mixtures generally showed higher yield stability compared to monocultures, especially in response to annual weather variability at a site over time. This practice of mixing cultivars can be integrated into intensified cropping systems where species monocultures dominate, as well as in smallholder cropping systems where low-cost improvements are in demand. Overall, these results suggest that cultivar mixtures are a viable strategy to increase diversity in agroecosystems, promoting increased yield and yield stability, with minimal environmental impact.
Bibliografia:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1051-0761
1939-5582
DOI:10.1002/eap.1629