Land-use history affects the distribution of the saprophytic orchid Wullschlaegelia calcarata in Puerto Rico's Tabonuco Forest
Land-use history affects the distribution of the saprophytic orchid Wullschlaegelia calcarata in Puerto Rico's Tabonuco Forest
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DOI：
10.1111/j.1744-7429.2006.00167.x
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发表时间：
2006-07-01
期刊：
影响因子：
2.1
通讯作者：
Zimmerman, Jess K.
中科院分区：
文献类型：
--
作者：
Bergman, Erin;Ackerman, James D.;Zimmerman, Jess K.
伐木和农业等人类活动会改变森林结构、生态系统功能和生物多样性，从而严重破坏森林生态系统。这些变化可能产生长期影响，影响森林恢复。我们调查了过去的人为干扰的影响，目前的分布在波多黎各的热带雨林的林下，无叶兰花，Wullschlaegelia calcarata 70年后恢复。我们的研究地点是位于卢基略实验森林的16公顷卢基略森林动态图，该图有四个不同土地利用强度的区域，这些区域与1936年拍摄的航空照片中看到的树冠覆盖变化不同。我们记录了兰花在六个10米宽，500米长的样带在四个不同的土地利用历史领域。我们发现，在1936年，兰花不存在于树冠覆盖率<20%的区域，而在树冠覆盖率> 80%的区域最丰富，受人类活动的影响最小。不同土地利用历史地区的树种组成不同，我们的观察表明，这种变化可能会影响当地的分布W。距状体我们还测量了落叶生物量，并确定了有和没有兰花的地区的落叶。具有高比例的Buchenavia tetraphylla叶的凋落物有更多的兰花。尽管人类活动在1932年停止，但卢基略森林的土地利用历史仍然给W.距状体
Human activities such as logging and agriculture can severely damage forest ecosystems by changing forest structure, ecosystem function, and biodiversity. These changes may have long-lasting consequences, which influence forest recovery. We investigated the effect of past human disturbance on the current distribution of an understory, achlorophyllous orchid, Wullschlaegelia calcarata in Puerto Rico's tropical rain forest after 70 yr of recovery. Our study site was the 16-ha Luquillo Forest Dynamics Plot located in the Luquillo Experimental Forest, which has four areas with differing intensity of land use that have been distinguished from variation in canopy cover seen in aerial photographs taken in 1936. We recorded orchids in six 10-m-wide, 500-m-long transects across four different areas of land-use history. We found that the orchid was not present in an area of the plot which had < 20 percent canopy cover in 1936, and was most abundant in the area with > 80 percent canopy cover, which had been minimally impacted by human activity. Tree species composition varied among land-use history areas, and our observations suggested that this variation might be influencing the local distribution of W. calcarata. We also measured leaf litter biomass and identified the leaves of litter in areas with and without the orchid. Litter with a high proportion of Buchenavia tetraphylla leaves had more orchids. Even though human disturbance ceased in 1932, land-use history in the Luquillo Forest still casts a shadow over the distribution of W. calcarata.