A Complete Collection of 100000 Whys
Fav十万个为什么
为什么银杏树特别少？
银杏树特别少，主要基于以下几个原因：
1、雌雄异株特性：银杏树为雌雄异株植物，需要雄株和雌株共同存在才能完成授粉，这种繁育方式限制了其自然繁殖能力。
2、基因多样性低：现代银杏几乎完全依赖无性繁殖（如扦插），导致基因多样性严重不足，降低了其适应环境变化的能力。
3、生态环境破坏：人类活动导致银杏的自然栖息地被破坏，野生种群数量稀少，进一步加剧了其濒危状态。
总结：银杏树特别少的原因主要是由于其雌雄异株的特性、基因多样性低以及生态环境破坏共同作用的结果。这些因素使其自然繁殖能力受限，适应能力下降，野生种群数量稀少，成为濒危物种。
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