在地中海气候沿海生态系统中的上层和下层社区的不同恢复途径
Brook M Constantz1, John C Stella2, Karen D Holl1
1Environmental Studies Department, University of California, Santa Cruz, California, USA.
概括
与30年来参考地点相比,恢复后的森林显示结构有所改善,但构成没有改善. 侵袭性Rubus armeniacus阻碍了本地地下树木的恢复,需要干预才能完全恢复生态系统.
科学领域:
- 恢复生态学 恢复生态学
- 森林生态 森林生态
- 植物社区动态 植物社区动态
背景情况:
- 生态系统恢复模型预测恢复后与参考地点的趋同.
- 纵向数据对于评估生态系统恢复轨迹至关重要.
- 在不同生态系统组件的恢复率中存在变化.
研究的目的:
- 评估植被结构和社区组成在恢复和参考森林的时间趋同.
- 为了确定上层和下层的恢复模式是否不同.
- 评估萨克拉门托河沿线恢复工作的长期成功.
主要方法:
- 使用了9-16年间隔进行的重复植被调查.
- 测量森林结构 (基底面积,茎密度) 和社区组成 (物种覆盖).
- 在数据分析中采用了通用线性混合模型和非米度多维缩放.
主要成果:
- 恢复后的森林在35年内与基层结构 (基底面积,茎密度) 中的参考地点相聚.
- 由于最初的种植差异和有限的新物种招募,上层物种组成仍然是不同的.
- 恢复后的地下草表现出侵袭性Rubus armeniacus覆盖的增加,对本地地下草覆盖产生了负面影响,并阻碍了恢复.
结论:
- 森林上层结构恢复了,但构成与参考地点没有完全融合.
- 侵袭性Rubus armeniacus显著降低了恢复的地下植物,阻碍了本地植物社区的恢复.
- 实质性的,持续的干预是必要的,以管理入侵物种,并实现生态系统的全面恢复.
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