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个点在每个点内随机选取20株黑麦草用铁铲挖出完整根系。
Three neat and evenly spaced points were selected in the middle of each plot, and 20 plants of Lolium multiflorum were randomly sampled within each point, with intact root systems excavated using an iron shovel.
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