Comparative Ecological Study on Subtropical Forest in Canary

阿纳加云雾林是在加那利群岛特内里费岛云区发展起来的亚热带常绿阔叶林（所谓的月桂林）。森林内部全年相对湿度约为90%，但湿度随风向和信风逆温层高度而波动。土壤水分和养分条件沿地形生境（山脊、斜坡和山谷）逐渐变化；与山谷生境相比，山脊生境C/N比高，NO_3浓度低，pF值高。根据土壤和大气条件（大风等）的不同，山脊生境的树高和叶大小比山谷生境小。统计结果表明，在所有常绿阔叶树种中，最丰富的树木性状是假枝芽型（82.3%）和无叶基型（47%）。这些特征支持了这样一种观点，即加那利群岛的常绿云雾林树木是第三纪热带/亚热带湿润森林的遗迹，曾经在忒提斯周围蔓延得更广。

Anaga cloud forests are the subtropical evergreen broad-leaved forests (so-called laurisilva) developed in the cloud zone of Tenerife, the Canary Islands. The forest-interior was humid conditions of Ca. 90 % RH throughout the year, though the humidity fluctuated depending on the wind direction and the height of trade-wind inversion layer. Soil moisture and nutrient conditions were changed gradually along the topographical habitat (ridge, slope, and valley) ; ridge habitat had high C/N ratio, lower NO_3 concentration, and high pF value comparing to those in valley. Depending on the soil and atmospheric conditions (strong wind, etc.), tree height and leaf-size were small at ridge habitat compared to those in valley. Statistics for all the evergreen broad-leaved tree species found in Anaga forest, most abundant tree traits were hypsophyllary-bud type (82.3 %) and notopyll-class leaf (47 %). These features support the notion that the evergreen cloud forest trees in the Canaries are the relic of the Tertiary tropical/subtropical humid forests once spreading much wider areas surrounding Thethys.