The significant role of tropical forest ecosystems in the global carbon budget has increased the need for accurate estimates of tropical forest biomass.The lack of large-scale biomass allometric equations hampers the ...The significant role of tropical forest ecosystems in the global carbon budget has increased the need for accurate estimates of tropical forest biomass.The lack of large-scale biomass allometric equations hampers the understanding of the spatial distribution of tree biomass and carbon stocks and their influencing factors in West Africa.This study aimed to develop allometric equations to estimate aboveground biomass of African oak(Afzelia africana Sm.)in Burkina Faso and to analyze factors affecting the variability of tree biomass and carbon storage.Sixty individual trees were destructively sampled in four protected areas along two climatic zones.In each climatic zone,log–log models were tested and fitted to each aboveground biomass component and to the total aboveground biomass.Carbon content in tree aboveground components was evaluated using the ash method.All validated equations showed good fit and performance with high explained variance.Allometric equations differed between the Sudano-sahelian zone and the Sudanian zone,except for leaf biomass equations.Both biomass allocation and carbon content varied significantly between tree components but not between climatic zones.Carbon content in tree components followed the patterns of biomass allocation with branches accounting for the highest proportion.In the two climatic zones,carbon contents were 50.18–52.62%for leaves,54.78–54.94%for stems and 54.96–55.99%for branches.Dry biomass ranged from 509.05 to 765.56 kg tree^-1 at site level and from 620.21 to 624.48 kg tree^-1 along climatic zones.Carbon content varied from 53.90%in the Sudano-sahelian zone to 54.39%in the Sudanian zone.This study indicated that climate does not influence aboveground biomass production and carbon sequestration of Afzelia africana along the Sudanosahelian and the Sudanian climatic zones of Burkina Faso.Future studies on climate–growth relationships should contribute to better understanding climate effects on biomass production and carbon storage.展开更多
Sahel zone has been reported as one of the most vulnerable regions to climate change, so serious attention must be paid to this zone by researchers and development actors who are interested in environmental-human dyna...Sahel zone has been reported as one of the most vulnerable regions to climate change, so serious attention must be paid to this zone by researchers and development actors who are interested in environmental-human dynamics and interactions. The aim of this study was to bring more insight into the impact of actions aiming at reducing land degradation, regreening the Sahel, stopping population migration and reducing the pressure on land in the Sahelian zone. The study focused on farmland dynamic in Ouahigouya municipality based on remote sensing data from 1986 to 2016 using intensity analysis. The annual time interval change was 0.77% and 2.46% for 1986-2001 and 2001-2016, respectively. Farmlands gained from mixt vegetation, water bodies and from bar lands. Mixed vegetation and water bodies were both active during both intervals while the other land use such as woodland and bar land were dormant. Combining land use land cover analysis and intensity analysis was found to be effective for assessing the differentiated impact of the various land restoration actions.展开更多
基金funded by the German Federal Ministry of Education and Research (BMBF) through the West African Science Service Centre on Climate Change and Adapted Land Use (WASCAL) program。
文摘The significant role of tropical forest ecosystems in the global carbon budget has increased the need for accurate estimates of tropical forest biomass.The lack of large-scale biomass allometric equations hampers the understanding of the spatial distribution of tree biomass and carbon stocks and their influencing factors in West Africa.This study aimed to develop allometric equations to estimate aboveground biomass of African oak(Afzelia africana Sm.)in Burkina Faso and to analyze factors affecting the variability of tree biomass and carbon storage.Sixty individual trees were destructively sampled in four protected areas along two climatic zones.In each climatic zone,log–log models were tested and fitted to each aboveground biomass component and to the total aboveground biomass.Carbon content in tree aboveground components was evaluated using the ash method.All validated equations showed good fit and performance with high explained variance.Allometric equations differed between the Sudano-sahelian zone and the Sudanian zone,except for leaf biomass equations.Both biomass allocation and carbon content varied significantly between tree components but not between climatic zones.Carbon content in tree components followed the patterns of biomass allocation with branches accounting for the highest proportion.In the two climatic zones,carbon contents were 50.18–52.62%for leaves,54.78–54.94%for stems and 54.96–55.99%for branches.Dry biomass ranged from 509.05 to 765.56 kg tree^-1 at site level and from 620.21 to 624.48 kg tree^-1 along climatic zones.Carbon content varied from 53.90%in the Sudano-sahelian zone to 54.39%in the Sudanian zone.This study indicated that climate does not influence aboveground biomass production and carbon sequestration of Afzelia africana along the Sudanosahelian and the Sudanian climatic zones of Burkina Faso.Future studies on climate–growth relationships should contribute to better understanding climate effects on biomass production and carbon storage.
文摘Sahel zone has been reported as one of the most vulnerable regions to climate change, so serious attention must be paid to this zone by researchers and development actors who are interested in environmental-human dynamics and interactions. The aim of this study was to bring more insight into the impact of actions aiming at reducing land degradation, regreening the Sahel, stopping population migration and reducing the pressure on land in the Sahelian zone. The study focused on farmland dynamic in Ouahigouya municipality based on remote sensing data from 1986 to 2016 using intensity analysis. The annual time interval change was 0.77% and 2.46% for 1986-2001 and 2001-2016, respectively. Farmlands gained from mixt vegetation, water bodies and from bar lands. Mixed vegetation and water bodies were both active during both intervals while the other land use such as woodland and bar land were dormant. Combining land use land cover analysis and intensity analysis was found to be effective for assessing the differentiated impact of the various land restoration actions.
