偶有种 accidental species
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指从其他群落侵入来的在植物群落的组成种中，有偶然生长下来的种类，或由过去的群落遗留下来的种类，这种稀少的种类，为偶有种。前者多数出现于群落边缘或混生的部分。后者常发现于演替后的新群落中。其Gesellschaftstreue均为 1，而优势度亦低。
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