Drivers of biomass recovery in a secondary forested landscape of West Africa
Drivers of biomass recovery in a secondary forested landscape of West Africa
复制标题
西非次生林景观生物量恢复的驱动因素
DOI：
10.1016/j.foreco.2018.11.021
复制
发表时间：
2019
影响因子：
3.7
通讯作者：
B. Hérault
中科院分区：
文献类型：
--
作者：
A. N’Guessan;Justin K N’Dja;Olivier N. Yao;B. Amani;R. Gouli;Camille Piponiot;I. C. Zo;B. Hérault
西非人口迅速增长，对农业用地和森林产品的需求不断增加。因此，90%的原始雨林已经消失，其余的严重破碎和高度退化。虽然许多研究侧重于非洲完整森林的碳储存和通量，但关于次生林生物量恢复率的资料很少。我们研究了96个次生林和原始林片断（每个片断0.2公顷）的时间序列，其中32.103棵树的胸径>2.5 cm。我们在时间明确的贝叶斯框架中模拟了生物量恢复轨迹，并测试了与物理环境、地块历史和森林连通性相关的一组协变量对恢复率的影响。恢复率的轨迹是高度非线性的：恢复率从1年加速到37年，生物量恢复达到4.23兆克·公顷-1·年-1，然后减速。我们预测，平均而言，10%，25%和50%的古老的森林生物量分别恢复17，30和51年后放弃。恢复率在很大程度上取决于残留树木（以前原始森林的残留物）的数量和废弃前种植的作物。后者引起了很大的差异所需的时间恢复50%的原始森林生物量：从38年前的山药田到86年前的稻田。我们的研究结果强调：（一）非常缓慢的恢复速度西非森林相比，新热带森林（二）过去的人类活动和管理选择对生态系统生物量恢复的长期影响西非退化的森林。
The rapidly growing human population in West Africa has generated increasing demand for agricultural land and forest products. Consequently 90% of the original rainforest cover has now disappeared and the remainder is heavily fragmented and highly degraded. Although many studies have focused on carbon stocks and fluxes in intact African forests, little information exists on biomass recovery rates in secondary forests. We studied a chronosequence of 96 secondary and old-growth forest fragments (0.2 ha each) where 32.103 trees with Diameter at Breast Height >2.5 cm have been censused. We modelled the biomass recovery trajectories in a time-explicit Bayesian framework and tested the effect on recovery rates of a large set of covariates related to the physical environment, plot history, and forest connectivity. Recovery rate trajectory is highly non-linear: recovery rates accelerated from 1 to 37 years, when biomass recovery reached 4.23 Mg·ha−1·yr−1, and decelerated afterwards. We predict that, on average, 10%, 25% and 50% of the old-growth forest biomass is respectively recovered 17, 30, and 51 years after abandonment. Recovery rates are strongly shaped by both the number of remnant trees (residuals of the former old-growth forest) and the previous crop cultivated before abandonment. The latter induced large differences in the time needed to recover 50% of an old-growth forest biomass: from 38 years for former Yam fields up to 86 years for former rice fields. Our results emphasize (i) the very slow recovery rates of West African forests, as compared to Neotropical forests (ii) the long-lasting impacts of past human activities and management choices on ecosystem biomass recovery in West African degraded forests.
影响因子：
5.8
作者：
Carpenter, Bob;Gelman, Andrew;Riddell, Allen
通讯作者：
Riddell, Allen