Liana dynamics reflect land-use history and hurricane response in a Puerto Rican forest
Liana dynamics reflect land-use history and hurricane response in a Puerto Rican forest
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藤本植物动态反映了波多黎各森林的土地利用历史和飓风响应
DOI：
10.1017/s0266467417000049
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发表时间：
2017
影响因子：
1.4
通讯作者：
N. Brokaw
中科院分区：
文献类型：
--
作者：
J. Hogan;Silvette Mayorquín;K. Rice;Jill Thompson;J. Zimmerman;N. Brokaw
摘要/ Abstract摘要：我们研究了波多黎各亚热带潮湿森林中的藤本植物，以了解飓风影响和过去人类土地利用如何相互作用影响藤本植物动态。我们比较了一个高强度的土地利用区域，在1934年被废弃之前，这里的森林被砍伐，用于自给农业，然后重新生长到一个低强度的土地利用区域，在20世纪40年代，美国农业部林业局只在那里进行了一些选择性的实验性伐木。在此之前，这两个地区都受到了1989年雨果飓风的强烈影响，1998年乔治飓风对这两个地区造成了较小程度的破坏，增加了冠层开度，随后增加了树干密度。2001年至2015年间，光环境的变化和森林结构的恢复导致高强度土地利用区域的树干密度减少了约50%，因为招募的树苗自然变薄。在该地区，藤本植物丰度增加了103%，生物量增加了两倍，藤本植物对树木的占用增加了近50%。在低强度土地利用区，幼枝密度保持稳定，藤本植物丰度仅增加33%，生物量增加39%，乔木占比保持不变。藤本植物的花和果实产量在14 a间隔期有所增加，且在土地利用强度高的样方中增加幅度更大。这项研究的结果确实表明，树木演替动态与藤本植物的增加是如何迅速吻合的，但在我们的站点上干扰的飓风影响的混淆，使我们无法断言藤本植物密度和生物量的增加可以归因于与新热带其他地区森林相同的原因。
Abstract: We studied lianas in a subtropical wet forest in Puerto Rico to understand how hurricane impacts and past human land-uses interact to affect liana dynamics over a 14-year period. We compared a high-intensity land-use area, where the forest that had been cleared, and used for subsistence agriculture before being abandoned in 1934 then regrew to a low-intensity land-use area, in which there had been only some selective experimental logging by the USDA Forest Service in the 1940s. Prior to our study, both areas were strongly affected by Hurricane Hugo in 1989, and again damaged to a lesser degree by Hurricane Georges in 1998, increasing canopy openness and subsequently increasing tree stem densities. Between 2001 and 2015, changes in the light environment and the recovery of forest structure resulted in roughly a 50% reduction in tree stem densities in the high-intensity land-use area, as recruited saplings naturally thinned. In this area, liana abundance increased by 103%, liana biomass tripled, and occupancy of trees by lianas grew by nearly 50%. In the low-intensity land-use area, juvenile stem densities were stable, and resultantly liana abundance only increased by 33%, liana biomass rose 39%, and the occupancy of trees was constant. Liana flower and fruit production increased over the 14-year interval, and these increases were much greater in the high-intensity land-use quadrats. Results of this study do show how rapid forest tree successional dynamics coincide with liana increases, but the confounding of hurricane effects of disturbance at our site, prevent us from asserting that the increases in liana density and biomass can be attributed to the same causes as those in forests elsewhere in the Neotropics.