Abstract Within the frame of the EU Common Agricultural Policy, most countries subsidise the establishment and maintenance of perennial flower strips on arable land within Agri-Environmental Schemes to provide foraging habitats and refuges for wildlife. In a replicated field experiment, we studied the effects of different types of seed mixtures on the establishment and maintenance of perennial flower strips on fertile arable land in the federal state of Saxony-Anhalt, Germany over seven years. The seed mixtures were commonly applied within recent Common Agricultural Policy funding periods: (1) a low-diversity cultivar standard seed mixture (CULTIVAR), (2) a high-diversity cultivar and native plant mixture (MIX), and (3) a high-diversity native plant mixture (WILDFLOWER). All plots were mulched every year in March and at the beginning of August. The low success of CULTIVAR triggered the massive encroachment of spontaneously established perennial grasses. In MIX, too, cultivars have disappeared after the first year. Both wildflower variants were successful in maintaining a high cover of sown perennial native forbs and a high ratio of established sown species, even after seven years. WILDFLOWER always tended to show better values than MIX. Furthermore, spontaneously establishing species began to spread their cover in MIX in the fifth year, with a very strongly increasing tendency, whereas in WILDFLOWER cover of spontaneously immigrating species stayed satisfyingly low. Using native wildflowers to establish perennial wildflower strips was very effective in maintaining high species diversity within the Agri-Environmental Schemes funding period of five years and beyond. WILDFLOWER was especially successful. On the other hand, CULTIVAR failed completely. On fertile soils in regions with rather low yearly precipitation, mulching twice a year supported the maintenance of perennial wildflower strips.

中文翻译：

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种子混合物强烈影响肥沃土壤上多年生花条的物种丰富度和质量

摘要 在欧盟共同农业政策的框架内，大多数国家在农业环境计划中补贴可耕地的多年生花带的建立和维护，为野生动物提供觅食栖息地和避难所。在重复的田间试验中，我们研究了七年来不同类型的种子混合物对德国萨克森-安哈尔特联邦州肥沃耕地上多年生花带的建立和维持的影响。种子混合物在最近的共同农业政策资助期内普遍使用：(1) 低多样性品种标准种子混合物 (CULTIVAR)，(2) 高多样性品种和本地植物混合物 (MIX)，以及 (3)高多样性本地植物混合物（WILDFLOWER）。每年三月和八月初对所有地块进行覆盖。CULTIVAR 的低成功引发了自发建立的多年生草的大规模侵占。在 MIX 中，栽培品种也在第一年之后消失了。即使在七年后，这两种野花变种都成功地保持了多年生本地杂草的高覆盖率和高比例的已播种。WILDFLOWER 总是倾向于显示比 MIX 更好的值。此外，自发建立的物种在第 5 年开始在 MIX 中扩展它们的覆盖度，并且具有非常强烈的增加趋势，而在 WILDFLOWER 中，自发迁徙物种的覆盖度保持在令人满意的低水平。在农业环境计划五年及以后的资助期内，使用本地野花种植多年生野花带对于保持高物种多样性非常有效。WILDFLOWER 尤其成功。另一方面，CULTIVAR 完全失败了。在年降水量相当低的地区的肥沃土壤上，每年覆盖两次有助于保持多年生野花条。