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Effect of species identity and diversity on biomass production and its stability in cover crop mixtures

Wendling, Marina; Charles, Raphaël; Herrera, Juan; Amossé, Camille; Jeangros, Bernard; Walter, Achim and Büchi, Lucie (2019) Effect of species identity and diversity on biomass production and its stability in cover crop mixtures. Agriculture, Ecosystems & Environment, 281, pp. 81-91.

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Summary

Thanks to positive interactions between species, growing mixtures of cover crops allows improving the ecosystem services provided by cover crop cultivation. In this study, the influence of species diversity but also of species identity and mixture composition on cover crop biomass production and its stability in diverse growing conditions was studied. Several field experiments (varying soil type, preceding crop, soil tillage, sowing density, nitrogen fertilization and spatial replication) were set up in Switzerland during the period 2013−2016. In these experiments, the performance of cover crop species grown as sole crops was compared to that of multispecific mixtures. Part of these experiments followed a simplex design in which four cover crop species were combined together with different proportions, producing a total of 25 mixtures of varied diversity. The other experiments compared sole crop and mixture biomass production in standard randomised block or split plot experiments.
Globally, mixtures tended to produce slightly more biomass than the sole crops, with an average between 2 t/ha and 3.2 t/ha for sole crops and of about 3.5 t/ha for mixtures. Overyielding as well as transgressive overyielding were observed, in 81% and 37% of the cases on average, re-spectively. However no effect of the level of species diversity within mixtures could be found. Biomass production of cover crops was highly influenced by their growing conditions and by the identity of the species involved, especially for sole crops and bispecific mixtures. The analyses of the simplex experiments allowed to show that species interactions played an important role in biomass production in 7 out of 15 growing conditions, even for a short growing period of about three months. Most of the cover crop mixtures with the highest biomass production had a rather low diversity, i.e. about two species on average, but the identity of the species involved in these mixtures depended on the growing conditions. Our results do not show a strong diversity effect on the biomass production of cover crop mixtures cultivated for a short growing period, but a stronger effect of species identity and of the growing conditions.
Mixtures with low diversity generally outcompete more diverse mixtures, but more diverse mix-tures offer an insurance effect given the unpredictability of growing conditions during cover crop cultivation.


EPrint Type:Journal paper
Keywords:Complementarity effect; Growing conditions; Interspecific interactions; Overyielding; Risk of failure: Simplex design
Subjects: Soil > Soil quality
Crop husbandry > Crop combinations and interactions
Environmental aspects > Biodiversity and ecosystem services
Research affiliation: Switzerland > ZAHW
Switzerland > Agroscope
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland
UK > Natural Resources Institute (NRI Uni Greenwich)
ISSN:01678809
DOI:10.1016/j.agee.2019.04.032
Deposited By: Wendling, Dr Marina
ID Code:36396
Deposited On:03 Sep 2019 08:17
Last Modified:03 Sep 2019 08:17
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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