A tree-ring based comparison of Terminalia superba climate-growth relationships in West and Central Africa
A tree-ring based comparison of Terminalia superba climate-growth relationships in West and Central Africa
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DOI：
10.1007/s00468-013-0871-3
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发表时间：
2013-10-01
影响因子：
2.3
通讯作者：
Beeckman, Hans
中科院分区：
文献类型：
--
作者：
De Ridder, Maaike;Trouet, Valerie;Beeckman, Hans
热带低地森林的特点是气候潮湿，降水量、旱季长度和相对湿度年际变化。非洲树种Terminalia superba Engl. & Diels有一个很大的分布区域，并可能将这些变化纳入其树木年轮。树轮分析进行了60种植园树木（增量核心）和41天然树木（干磁盘）从象牙海岸和刚果马永贝森林。天然林和老人工林（50-55年）的生长模式相似。为这两个样本地区制定了地区编年史，并显示出1959-2008年期间的远距离关系。马永贝的增长与雨季初期的降水，但没有发现在象牙海岸树木生长和降水之间的关系。刚果树木可能比科特迪瓦树木表现出更高的气候敏感性，因为马永贝的降水量更有限，刚果T。木荷树被发现更接近其分布的边缘。同样，马永贝的树木生长也受到雨季初期几内亚湾和南大西洋海温的影响。然而，树木生长的影响，在这两个区域。在Mayombe，拉尼娜年与更强的树木生长，而在象牙海岸，厄尔尼诺年对应更强的树木生长。ENSO，降水和树木生长之间的关系是原始的赤道非洲森林，表明全球气候变化对树木生长的影响。
Tropical lowland forests are characterized by humid climate conditions with interannual variations in amount of precipitation, length of dry season, and relative humidity. The African tree species, Terminalia superba Engl. & Diels has a large distribution area and potentially incorporates these variations in its tree rings. Tree ring analysis was performed on 60 plantation trees (increment cores) and 41 natural trees (stem disks) from Ivory Coast and the Congolese Mayombe Forest. Natural forests and old plantations (50-55 years) showed similar growth patterns. Regional chronologies were developed for the two sample regions and showed a long-distance relationship for the period 1959-2008. Growth in the Mayombe was associated with early rainy season precipitation, but no relation was found between tree growth and precipitation in Ivory Coast. Congolese trees possibly show a higher climate-sensitivity than Ivorian trees, because precipitation in the Mayombe is more limiting, and Congolese T. superba trees are found closer to the margins of their distribution. Likewise, tree growth in the Mayombe was also influenced by the SSTs of the Gulf of Guinea and the South Atlantic Ocean during the early rainy season. However, tree growth was influenced by ENSO in both regions. In the Mayombe, La Nia years were associated with stronger tree growth whereas in Ivory Coast, El Nio years corresponded with stronger tree growth. The presented relation between ENSO, precipitation and tree growth is original for equatorial African forests, suggesting an influence of global climate variability on tree growth.