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Development of the arable vegetation 23 years after conversion from conventional to organic farming – experiences from a farm-scale case study in southern Germany / Harald Albrecht in Tuexenia, 40 (2020) 

Public Citation [article]  inTuexenia > 40 (2020) . - 291-308 Titre : Development of the arable vegetation 23 years after conversion from conventional to organic farming – experiences from a farm-scale case study in southern Germany Type de document : Imprimé Auteurs : Harald Albrecht ; Sandra Mademann ; Helmut Weikl Année de publication : 2020 Article en page(s) : 291-308 Langues : Anglais (eng) Catégories : [CBNPMP-Thématique] Messicole Résumé : Recent meta-analyses assessing the impact of organic farming on plant species diversity showed that positive effects mainly occurred at a small scale while benefits at the farm or landscape level were less pronounced. The studies also detected that common species were more favored by organic farming than rare ones. In a farm scale study in southern Bavaria, Germany, we analyzed how the conversion to organic farming changed arable plant communities over a 23-years period and questioned the impact on weed management and species conservation. Vegetation sampling started two years before this conver-sion. At the end of the study period, crop cover had slightly decreased but yields of winter cereals (5.2 t/ha) still achieved 78% of the pre-organic harvest. Arable plant cover increased from 2 to 40% and the soil seed banks enlarged from 4200 to 33,300 seeds m-². Total numbers of plant species increased by 46% at the plot level and by 22% at the farm level, plant species characteristic of arable fields in-creased by 50% and 19%, respectively. Populations of both threatened and problematic plant species clearly profited from the conversion. Our results generally confirm that organic farming benefits plant biodiversity in arable land. Such benefits being more pronounced at the plot scale verifies previous studies, however, these effects were also visible over the whole arable area of the farm. A significant increase in the cover of insect-pollinated plants indicated that organic management can also support ecosystem functions. Our data prove that long-term organic farming can increase nature conservation value of the arable flora with only a moderate setback of crop yields. Lien pérenne : DOI : 10.14471/2020.40.005 Permalink : https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=148429 Albrecht, Harald, Mademann, Sandra, Weikl, Helmut 2020 Development of the arable vegetation 23 years after conversion from conventional to organic farming – experiences from a farm-scale case study in southern Germany. Tuexenia, 40: 291-308.

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