厄尔尼诺现象和伐木对婆罗洲树冠树木招募的影响
1Department of Biology and School of Natural Resources and Environment, University of Michigan, Ann Arbor, MI 48109, USA. U.S. Agency for International Development-Natural Resource Management, Pontianak, West Kalimantan 78121, Indonenia. D.
概括
婆罗洲Dipterocarpaceae树依靠每3-4年同步杆结果,但伐木和气候变化已经破坏了这一重要的生殖战略,导致广泛的招募失败.
科学领域:
- 生态生态学 生态生态学
- 林业林业 林业 林业 林业
- 保护生物学 保护生物学
背景情况:
- 双类 (Dipterocarpaceae) 是波尔尼岛上占主导地位的树冠树,具有独特的杆结果繁殖策略.
- 杆果实包括同步的,不经常的种子在物种之间分散,以压倒种子捕食者.
- 这一战略对于这些生态和经济重要树木的再生至关重要.
研究的目的:
- 调查伐木和气候变化对Dipterocarpaceae杆果实和再生的影响.
- 评估结果事件的频率,强度和同步性的变化.
- 确定对种子生存能力和苗木建立的后果.
主要方法:
- 与厄尔尼诺-南方振荡 (ENSO) 事件相关的长期果实数据 (1986-1999) 的分析.
- 评估砍伐对果实模式和当地环境条件的影响.
- 在被伐木森林包围的国家公园中监测种子生存能力和苗木招募.
主要成果:
- 伐木减少了杆果实发作的程度和强度.
- 当地的厄尔尼诺现象因伐木而加剧,进一步压力树木.
- 观察到可行的种子和苗木机构的显著下降.
- 自1991年以来,二肉体在研究区域经历了招募失败.
结论:
- 伐木和气候变化严重威胁着Dipterocarpaceae的再生,因为它们会破坏杆果实.
- 这种生殖策略的丧失导致了婆罗洲森林的招募失败.
- 迫切需要采取保护措施来保护这些占主导地位的树冠树木及其生态系统.
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