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栗子病后的花变化可能会延迟几十年
Richard Karban1, Claire C Karban2
1Department of Entomology and Nematology, University of California, Davis, CA, United States of America.
PloS one
|October 2, 2024
概括
自从美国栗子 (Castanea dentata) 消失以来,雪南多阿国家公园的森林组成发生了显著的变化. 早期到中期的继承物种已经取代了树和,栗子芽的数量正在下降.
科学领域:
- 森林生态 森林生态
- 植物学 植物学
- 保护生物学 保护生物学
背景情况:
- 在栗子瘟疫发生之前,美国栗子和树在沈道国家公园中占主导地位.
- 以前的调查表明,树正在取代栗子,栗子存在的显著下降.
研究的目的:
- 在失去美国栗子后,重新挖掘雪南多阿国家公园白峡谷的森林组成.
- 评估几十年来森林结构和物种丰度的长期变化.
主要方法:
- 从1977年在白树峡谷的调查中重新调查了10个已建立的地点.
- 记录了树冠和底层树木,包括那些在剩余的栗子芽上生长的树木.
- 将当前森林组成与20世纪20年代和1977年的历史调查数据进行比较.
主要成果:
- 自1977年以来,森林树冠发生了重大变化,树和树的数量增加.
- 海姆洛克种群减少,树在树冠上变得不那么常见.
- 早期到中期继承树在很大程度上取代了树和.
- 自1977年以来,栗子芽的数量显著下降,可能是由于反复的死亡.
- 栗子的持久性与红树的存在和有限的地下林竞争有关,而在树/海姆洛克地点很少见.
结论:
- 美国栗子损失后森林组成的变化可能比以前理解的更为深刻.
- 失去像美国栗子这样的共同主导物种的长期生态影响仍在确定.
- 特定的微型息地条件影响了剩余的美国栗子芽的持久性.
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