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、有代表性的50 cm样点在样点内随机选取20株黑麦草用铁铲将黑麦草连根带泥铲出
50 cm representative and uniformly spaced sample points were selected in the middle of each plot, and 20 plants of black oat were randomly sampled and dug out with a shovel, including the roots and soil.
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