Reduced crop density increases floral resources to pollinators without affecting crop yield in organic and conventional fields
Sidemo-Holm, William LU ; Carrié, Romain LU ; Ekroos, Johan LU ; Lindström, Sandra A.M. LU
and Smith, Henrik G.
LU
(2021)
In Journal of Applied Ecology
58(7).
p.1421-1430
- Abstract
Effective weed control in agricultural crop fields increases yields, but simultaneously reduces floral resources for pollinators because many weed species provide pollen and nectar. Consequently, efforts to enhance crop yields on organic farms by using effective weed control methods risk compromising positive effects of organic farming on pollinating insects. Thus, it is important to find management strategies that alleviate the trade-off between crop yields and flowering weeds on organic farms. We investigated the relationship between cereal yields, flowering weeds and bumblebees on organic and conventional arable land. We also investigated the potential of adjusting crop sowing density to benefit flowering weed species richness and... (More)
Effective weed control in agricultural crop fields increases yields, but simultaneously reduces floral resources for pollinators because many weed species provide pollen and nectar. Consequently, efforts to enhance crop yields on organic farms by using effective weed control methods risk compromising positive effects of organic farming on pollinating insects. Thus, it is important to find management strategies that alleviate the trade-off between crop yields and flowering weeds on organic farms. We investigated the relationship between cereal yields, flowering weeds and bumblebees on organic and conventional arable land. We also investigated the potential of adjusting crop sowing density to benefit flowering weed species richness and floral resources to bumblebees without affecting crop yield. Floral resources and species richness of flowering weeds were higher in organic compared to conventional fields and were negatively related to crop yield in organic but not conventional fields (where the variation of floral resources and flowering weed species richness was comparatively low). Bumblebee species richness was higher in organic compared to conventional fields, and abundance was twice as high in organic as in conventional fields, but not significantly so. Yields in organic fields were two thirds of those in conventional fields. When simultaneously testing the effect of farming type (organic vs. conventional), crop yield and floral resources, only floral resources were related significantly to bumblebee abundance and species richness. A lower sowing density of the crop increased floral resources without negatively affecting crop yield. Synthesis and applications. We show that organic farming practices in cereals benefit bumblebees by allowing more flowering weeds, but at a cost in terms of lower yields. However, adjusting crop sowing density provides an opportunity to attain increased floral resources without negatively affecting crop yields. Thus, by increasing floral resources, adjusting crop sowing density may contribute to supporting high bumblebee densities, which in turn sustain pollination services to wild plants and insect-pollinated crops, such as oilseed rape and field beans, in agricultural landscapes. We suggest that sowing strategies have the potential to contribute to ecological intensification by supporting organisms that provide ecosystem services to agriculture.
(Less)
- author
- Sidemo-Holm, William
LU
; Carrié, Romain
LU
; Ekroos, Johan
LU
; Lindström, Sandra A.M.
LU
and Smith, Henrik G.
LU
- organization
- publishing date
- 2021-04-20
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- bumblebees, crop sowing density, ecological intensification, ecosystem services, floral resources, organic farming, pollination, weeds
- in
- Journal of Applied Ecology
- volume
- 58
- issue
- 7
- pages
- 1421 - 1430
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:85105757110
- ISSN
- 0021-8901
- DOI
- 10.1111/1365-2664.13887
- language
- English
- LU publication?
- yes
- id
- 44320abe-5e60-49b4-b066-2d9c9dd48fb2
- date added to LUP
- 2021-06-02 14:53:08
- date last changed
- 2024-05-04 08:16:12
@article{44320abe-5e60-49b4-b066-2d9c9dd48fb2,
abstract = {{<p>Effective weed control in agricultural crop fields increases yields, but simultaneously reduces floral resources for pollinators because many weed species provide pollen and nectar. Consequently, efforts to enhance crop yields on organic farms by using effective weed control methods risk compromising positive effects of organic farming on pollinating insects. Thus, it is important to find management strategies that alleviate the trade-off between crop yields and flowering weeds on organic farms. We investigated the relationship between cereal yields, flowering weeds and bumblebees on organic and conventional arable land. We also investigated the potential of adjusting crop sowing density to benefit flowering weed species richness and floral resources to bumblebees without affecting crop yield. Floral resources and species richness of flowering weeds were higher in organic compared to conventional fields and were negatively related to crop yield in organic but not conventional fields (where the variation of floral resources and flowering weed species richness was comparatively low). Bumblebee species richness was higher in organic compared to conventional fields, and abundance was twice as high in organic as in conventional fields, but not significantly so. Yields in organic fields were two thirds of those in conventional fields. When simultaneously testing the effect of farming type (organic vs. conventional), crop yield and floral resources, only floral resources were related significantly to bumblebee abundance and species richness. A lower sowing density of the crop increased floral resources without negatively affecting crop yield. Synthesis and applications. We show that organic farming practices in cereals benefit bumblebees by allowing more flowering weeds, but at a cost in terms of lower yields. However, adjusting crop sowing density provides an opportunity to attain increased floral resources without negatively affecting crop yields. Thus, by increasing floral resources, adjusting crop sowing density may contribute to supporting high bumblebee densities, which in turn sustain pollination services to wild plants and insect-pollinated crops, such as oilseed rape and field beans, in agricultural landscapes. We suggest that sowing strategies have the potential to contribute to ecological intensification by supporting organisms that provide ecosystem services to agriculture.</p>}},
author = {{Sidemo-Holm, William and Carrié, Romain and Ekroos, Johan and Lindström, Sandra A.M. and Smith, Henrik G.}},
issn = {{0021-8901}},
keywords = {{bumblebees; crop sowing density; ecological intensification; ecosystem services; floral resources; organic farming; pollination; weeds}},
language = {{eng}},
month = {{04}},
number = {{7}},
pages = {{1421--1430}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Journal of Applied Ecology}},
title = {{Reduced crop density increases floral resources to pollinators without affecting crop yield in organic and conventional fields}},
url = {{http://dx.doi.org/10.1111/1365-2664.13887}},
doi = {{10.1111/1365-2664.13887}},
volume = {{58}},
year = {{2021}},
}