Bird monitoring in six agriculturally dominated landscapes of Saxony-Anhalt (Germany) in 2001

Bird communities in agriculturally dominated landscapes in Saxony-Anhalt (Germany) were monitored according to the point count method (see Bibby, C.J. (2000) Bird census techniques. Academic Press, London). A central core area of 3 × 3 km within each sample site was divided into five square cells of 1 km**2 each according to a checkerboard grid. Within each of these 5 cells, 4 observation points were selected and at each point all singing, calling and seen bird species were registered within a radius of 250 m for 5 minutes. Surveys started around sunrise and ended about three hours later. A bird survey within one year was performed with three visits in the following periods: (1) 1-30 April, (2) 1-20 May, (3) 21 May-20 June. Based on the birds recorded in the field, the observed bird numbers at each point were translated into territory numbers per species as an expert guess.

德国萨克森-安哈尔特州农业主导景观中的鸟类群落，采用点计数法开展监测（详见Bibby, C.J.（2000）《鸟类普查技术》，伦敦学术出版社）。每个样地内的3×3 km核心区域，按照棋盘格网格划分为5个1 km²的正方形单元格。在每个单元格内选取4个观测点，各观测点均在250米半径范围内、持续5分钟的时长内，记录所有鸣唱、鸣叫及可见的鸟类物种。调查于日出前后启动，约3小时后结束。单年度内的鸟类调查在以下三个时段各开展一次：(1) 4月1日至30日；(2) 5月1日至20日；(3) 5月21日至6月20日。基于野外实地记录的鸟类个体，经专家估算，将各观测点记录的鸟类数量转换为对应物种种群的领域数量。