Carabids (ground beetles) are important beneficial insects that contribute to biological control of pests and weeds in crop production. They can be found in different agricultural landscape habitats. However, little has been studied about the composition and similarity of carabid assemblages between two major land covers types: cropland and grassland. In a context of declining grassland areas in farmlands, highlighting complementarities of these two land covers is crucial to encourage land use planning that favors biodiversity. The objective of this study was to evaluate the relative and shared contribution of cereal crops and grasslands to carabid diversity in farmlands. Carabids were sampled in 104 pairs of cereal fields and grasslands in 3 agricultural regions of southeastern France. Carabid diversity was further analyzed with multiple regression models, including different local parameters. The correlations between assemblage similarities and geographical distance of sampled cereal fields and grasslands were also studied. Overall, 115 different species were found, 82 in cereal fields and 95 in grasslands. Per site species number and activity-density were higher in the two study regions with higher grassland cover. Evenness of carabid assemblages were higher in grasslands. Cropland and grassland remained strongly distinct, but assemblages showed higher similarity up to 4 km distance from each other. The study illustrates the major interest in preserving grassland within farmland for land use planners and/or policy makers. We found that grasslands and croplands complement each other. Though they host distinct communities, they provide continuous and different resources to the species throughout the year.

甲壳虫（地甲虫）是重要的有益昆虫，有助于对作物生产中的有害生物和杂草进行生物防治。它们可以在不同的农业景观栖息地中找到。但是，关于两种主要土地覆被类型（农田和草地）之间的甲节组合的组成和相似性的研究很少。在农田草地面积不断减少的情况下，强调这两个土地覆盖的互补性对于鼓励有利于生物多样性的土地利用规划至关重要。这项研究的目的是评估谷物作物和草地对农田中卡拉万豆多样性的相对和共同贡献。在法国东南部3个农业地区的104对谷物田和草原中对钩节藻进行了采样。使用多个回归模型（包括不同的局部参数）进一步分析了Carabid多样性。还研究了采样相似的谷物田和草地的组合相似性与地理距离之间的相关性。总体上，发现了115种不同的物种，其中82种在谷物田中，而95种在草原上。在两个具有较高草地覆盖率的研究区域中，每个站点的物种数量和活动密度都更高。草地上甲节组合的均匀度较高。耕地和草地仍然保持强烈的区别，但组合之间的相似性最高可达4 km。该研究表明，土地用途规划者和/或政策制定者对保护农田内的草地非常感兴趣。我们发现草原和农田相互补充。尽管他们拥有不同的社区，