请按照nature期刊标准翻译下面一句话：在每个小区中间部位选取整齐均匀的3个样点在每个样点内随机选取20株黑麦草用铁铲挖出完整根系。
Three evenly spaced sampling points were selected in the middle of each plot, and 20 individuals of black oatgrass were randomly selected and dug out with intact root systems at each sampling point. The translation follows the nature journal standard.
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