弃耕地演替又称撂荒地演替，是指耕地弃耕撂荒后所发生的次生演替。引起这种演替的最彻底的破坏是森林转向农耕地。当耕地被废弃后，最初出现的植物是该地区植物区系中典型的一年生杂草，不久二年生杂草加入，然后是多年生草本，特别是禾本科杂草。
草本优势种会抑止其它草本植物种类的进入，延缓弃耕地演替速度。
The superior species of herb were able to hold back the entering for other herbs and delayed the succession velocity of old-field.
最后一次耕种，特别指最后一次耕种的耕种面状况、有无翻耕是影响当地弃耕地植被演替路径的两个重要因素。（3）弃耕早期阶段弃耕地往往会被周边某种离它较近的一年生草本所占据。
Particularly last time tillage and plowed or not were significant elements that affecting the succession way in the locality(. 3)At early stage, the old-fields were often occupied by annual herbs.
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