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作 者 ：唐勇；曹敏；张建候；任泳红

期 刊 ：云南植物研究 1997年 19卷 04期 页码：1-3

关键词：土壤种子库；刀耕火种；山黄麻林；西双版纳；

Keywords:Soil seed bank,

摘 要 ：山黄麻（Trema orientalis）为热带地区常见的先锋树种。在西双版纳地区，它常常在丢荒的刀耕火种地上形成单优种群，在次生演替的早期起着重要的作用。本文采用萌发实验法探讨了刀耕火种对一4龄山黄麻林的土壤种子库的影响。研究表明刀耕火种过程使土壤种子库的储量从林地的 65 355粒／m2降为烧后的 1070粒／m2，种子种类从林地 60种（隶属于 50属、24科）下降为 29种（隶属于 24属、18科），改变了土壤种子库的结构，提高了土壤种子库中耐火烧种类种子的比例，使在其后的植被恢复过程中有较强的竞争力，可导致其后植被的演替向偏途方向发展。

Abstract:As a common pioneer species in the tropics, Trema orientalis dominates the early stage of secondary succession after slash and burn agriculture in Xishuangbanna. This study deals with the impact of slash and burn agriculture on soil seed bank of a 4-year Trema orientalis for-est.The results show that seed storage is significantly reduced from 65 355 seeds /m2 to 1 070 seeds/ m2 by slash-and-burn agriculture. There were 60 species in soil seed bank before slash-and-burn and 29 specise after that. Fire leads to an increase of burning-resistant seeds in the proportion in soil seed bank. The succession of forest is retarded by slash-and-burn agricul-ture.

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