A heterogeneous landscape does not guarantee high crop pollination.

A heterogeneous landscape does not guarantee high crop pollination.
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DOI:
10.1098/rspb.2016.1472
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发表时间:
2016-09-14
期刊:
Proceedings. Biological sciences
影响因子:
--
通讯作者:
Hylander K
Hylander K
中科院分区:
其他
文献类型:
--
作者:
Samnegård U;Hambäck PA;Lemessa D;Nemomissa S;Hylander K

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依赖传粉媒介的作物的扩大,特别是在发展中国家,加上世界范围内传粉媒介减少的报告,引起了对可能出现产量差距的关切。直接依赖授粉服务获得粮食供应的农民往往生活在我们对授粉服务知之甚少的地区。在埃塞俄比亚农业景观的23个地点复制的操纵实验中,我们发现在一种常见的油料作物中授粉服务差,花粉严重受限。采用辅助授粉,产量平均增加91%。尽管异质的农业矩阵,我们发现一个低蜜蜂丰度,这可能解释穷人授粉服务。花粉限制的变化与周围的森林覆盖,当地蜜蜂的丰富度和蜜蜂的丰度无关。虽然通常增加传粉者的做法(限制使用杀虫剂、花带)是景观的一个组成部分,但这些因素显然是不够的。因此,迫切需要对增加授粉服务的管理进行调查。
The expansion of pollinator-dependent crops, especially in the developing world, together with reports of worldwide pollinator declines, raises concern of possible yield gaps. Farmers directly reliant on pollination services for food supply often live in regions where our knowledge of pollination services is poor. In a manipulative experiment replicated at 23 sites across an Ethiopian agricultural landscape, we found poor pollination services and severe pollen limitation in a common oil crop. With supplementary pollination, the yield increased on average by 91%. Despite the heterogeneous agricultural matrix, we found a low bee abundance, which may explain poor pollination services. The variation in pollen limitation was unrelated to surrounding forest cover, local bee richness and bee abundance. While practices that commonly increase pollinators (restricted pesticide use, flower strips) are an integral part of the landscape, these elements are apparently insufficient. Management to increase pollination services is therefore in need of urgent investigation.
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