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株黑麦草用铁铲挖出完整根系。
Fifty-centimeter sampling points that are neat, uniform, and representative were selected in the middle of each community, and 20 plants of ryegrass were randomly selected within each sampling point and their complete root systems were excavated using an iron shovel.
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