Early woody invasion under tree plantations in Costa Rica: Implications for forest restoration
Early woody invasion under tree plantations in Costa Rica: Implications for forest restoration
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DOI：
10.1111/j.1526-100x.1995.tb00092.x
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发表时间：
1995-12-01
影响因子：
3.2
通讯作者：
Montagnini, F
中科院分区：
文献类型：
--
作者：
Guariguata, MR;Rheingans, R;Montagnini, F
近年来，人们对人工林作为退化土地热带森林恢复促进者的作用进行了探索，但关于不同树种对植物林下入侵影响的数据很少。我们评估了在低地哥斯达黎加的三年生本地树木种植林下植物组成的早期模式，使用两个纯种治疗（蓝花楹copaia和Vochysia危地马拉）和一个混合种治疗（J. copaia，V.危地马拉，Stryphnodendron microstachyum，和Calophyllum brasiliense）。我们还监测了木本植物的入侵，在未种植的控制区占主导地位的草。不同种植园处理林下植被在光环境、木本植物的生长和更新以及木本更新的数量和质量上存在差异。森林乔木入侵下Vochysia出现增强，而灌木更丰富的蓝花楹和混合物种的治疗。木本植物的生长，草本覆盖，和林下的光利用率最高的蓝花楹下，中间混合种下，和最低的Vochysia。土壤储存的种子似乎是一个重要的来源，木本植物招聘蓝花楹和混合种和最小的重要性下Vochysia，可能是由于光抑制。看来，竞争从禾本科植物是一个主要因素，影响早期木本入侵在我们的研究领域。一年后，我们在未种植的对照组中没有发现木质补充。我们建议，以促进使用人工林作为森林恢复的工具，有必要收集基本的生态信息，不同的树种可能会影响植物林下殖民模式。
The role of tree plantations as facilitators of tropical forest restoration in degraded lands has been explored recently, but there are few data on the effect of different tree species on invasion of the plant understory. We evaluated early patterns of understory composition in three-year-old native tree plantations in lowland Costa Rica using two pure-species treatment (Jacaranda copaia and Vochysia guatemalensis) and one mixed-species treatment (J. copaia, V. guatemalensis, Stryphnodendron microstachyum, and Calophyllum brasiliense). We also monitored woody invasion in unplanted control areas dominated by grasses. The understory of the different plantation treatments differed in light environment, woody-plant growth and recruitment, and quantity and quality of woody regeneration. Forest tree invasion appeared to be enhanced under Vochysia, while shrubs were more abundant under the Jacaranda and mixed-species treatments. Woody plant growth, herbaceous cover, and understory light availability were highest under Jacaranda, intermediate under mixed species, and lowest under Vochysia. Soil-stored seeds seemed an important source for woody plant recruitment in Jacaranda and mixed species and of minimal importance under Vochysia, probably due to light suppression. It appears that competition from grasses is a major factor influencing early woody invasion in our study area. We found no woody recruitment after one year in the unplanted controls. We suggest that to promote the use of plantations as tools of forest restoration, there is a need to gather basic ecological information on how different tree species may influence patterns of plant understory colonization.