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Early indications of success rehabilitating an underperforming teak ( Tectona grandis ) plantation in Panama through enrichment planting
New forests ( IF 2.2 ) Pub Date : 2020-06-28 , DOI: 10.1007/s11056-020-09801-6
Abigail Marshall , Bailey P. McLaughlin , Camilla Zerr , Estrella Yanguas-Fernández , Jefferson S. Hall

Enrichment planting can be an effective strategy for increasing the ecological and economic value of timber plantations, but success depends on appropriate matching of under- and overstory species and site conditions. This case study in the Panama Canal Watershed explores the viability of enrichment planting for rehabilitating underperforming teak (Tectonia grandis) plantations, which are common in the area. Two high-value timber species native to the neotropics, Dalbergia retusa and Terminalia amazonia, were underplanted in an established teak plantation at the Agua Salud research site in the province of Colon, Panama. Seedling survival, basal diameter, height, total biomass and relative growth rate were assessed for the two years following planting. In contrast with the widespread belief that teak is a poor nurse tree, both species achieved promising early growth with low mortality in plantation understory conditions. Neither understory light availability nor combined above- and below-ground effects of crowding pressure from teak strongly predicted growth of either species. D. retusa, thought to be more shade-tolerant, performed equally across a range of intermediate light levels whereas T. amazonia, thought to be more heliotropic, performed best at the highest light levels, though light relationships explained little variation in seedling growth. These early findings support the suitability of either species for use in enrichment plantings in established, underperforming teak plantations in the Panama Canal Watershed. Longer-term research is needed to evaluate the potential of enrichment planting to increase profitability and ecosystem services such as carbon sequestration and water resource management in these plantations.



中文翻译:

通过丰富的种植成功恢复了巴拿马表现欠佳的柚木(Tectona grandis)种植的成功的早期迹象

丰富的种植可以是提高木材人工林的生态和经济价值的有效策略,但是成功取决于林下和林下物种和场地条件的适当匹配。巴拿马运河流域的这一案例研究探讨了丰富种植的可行性,以恢复该地区常见的表现欠佳的柚木(Tectonia grandis)种植园。新热带地区原生的两种高价值木材种,即黄檀黄皮榄仁木,在巴拿马科隆省的Agua Salud研究地点,将其种植在成熟的柚木种植园中。播种后两年评估幼苗的存活率,基径,高度,总生物量和相对生长率。与人们普遍认为柚木是一棵不良的nurse树相反,两种树种都实现了有希望的早期生长,且在人工林条件下的死亡率较低。柚木的地下光利用率和地上和地下的拥挤压力的综合影响都不能强烈预测这两种物种的生长。D. retusa,被认为是更耐荫的,在各种中等光照水平下表现均等,而T. amazonia尽管光照关系解释了幼苗的生长几乎没有变化,但被认为具有更好的定日性,在最高光照水平下表现最佳。这些早期发现支持这两种物种都适合用于巴拿马运河流域中成熟的,表现欠佳的柚木种植园。需要进行长期研究来评估增值种植的潜力,以提高这些种植园的获利能力和生态系统服务,例如碳固存和水资源管理。

更新日期:2020-06-28
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