Fatumah Nakiguli, Mohammed Ssemwanga, Ashraf Nkumba, Abasi Kigozi, Shadia Nassejje
Makerere University, College of Agriculture and Environmental Sciences (CAES), P. O. Box 7062, Kampala, Uganda.
Agriculture, Environment and Livelihoods (AGRILIV), P. O. Box 71257, Kampala, Uganda.
Heliyon. 2023 Feb 26;9(3):e14114. doi: 10.1016/j.heliyon.2023.e14114. eCollection 2023 Mar.
Climate change remains the single major threat to the realization of increased livestock production because of its impact on the quantity and quality of feed crops and forages, water availability, animal reproduction, and biodiversity. To minimize the negative impacts of climate change on livestock, an agroforestry project was implemented in the cattle corridor areas of Uganda. Predominant agroforestry tree species and improved grass were planted. At the age of 1.5 years, the aboveground biomass, aboveground carbon stock, and carbon dioxide equivalent emissions sequestrated by each sapling species strand and grass species were determined. From the results, the aboveground biomass (F = 92.21, = 0.020), aboveground carbon stock (F = 101.01, = 0.035), and the carbon dioxide equivalent emissions sequestrated (F = 71.02, = 0.0401) varied significantly among the studied species. Among the agroforestry saplings, (10.0 ± 0.7 ton/acre) had the highest aboveground biomass, while (4.3 ± 0.3 tons/acre) and (4.1 ± 0.2 tons/acre) had the lowest aboveground biomass. Similarly, the aboveground carbon stock was the highest in strand (4.70 ± 0.1 tons/acre) and lowest in the strand (1.94 ± 0.2 tons/acre). At a strand level, (17 ± 0.4 ton/acre) sequestrated the highest quantities of carbon dioxide equivalent emissions, followed by (10 ± 0.2 ton/acre) and (9 ± 0.5 ton/acre) species strands. (7 ± 0.2 ton/acre) and (7 ± 0.1 ton/acre) strands sequestrated the lowest quantities of carbon dioxide equivalent emissions. At the age of 1.5 years, the grass species were fully grown but only stored 0.51 ± 0.0 and 0.47 ± 0.0 tons/acre of Aboveground carbon for and respectively. The carbon dioxide equivalent emissions sequestrated by the grass: (1.9 ± 0.0 ton/acre) and (1.7 ± 0.0 ton/acre) were also less than that of the agroforestry saplings. From this study, the agroforestry species with higher wood biomass and fast growth rate are recommended for carbon dioxide emission sequestration.
气候变化仍然是实现牲畜产量增长的一个主要威胁，因为它会影响饲料作物和草料的数量与质量、水资源供应、动物繁殖以及生物多样性。为了尽量减少气候变化对牲畜的负面影响，乌干达在牛走廊地区实施了一个农林业项目。种植了主要的农林业树种和改良草种。在1.5岁时，测定了每个树苗品种带和草种的地上生物量、地上碳储量以及封存的二氧化碳当量排放量。结果显示，在研究的物种中，地上生物量（F = 92.21，P = 0.020）、地上碳储量（F = 101.01，P = 0.035）以及封存的二氧化碳当量排放量（F = 71.02，P = 0.0401）存在显著差异。在农林业树苗中，[树种1]（10.0 ± 0.7吨/英亩）的地上生物量最高，而[树种2]（4.3 ± 0.3吨/英亩）和[树种3]（4.1 ± 0.2吨/英亩）的地上生物量最低。同样，地上碳储量在[树种1]带中最高（4.70 ± 0.1吨/英亩），在[树种2]带中最低（1.94 ± 0.2吨/英亩）。在品种带水平上，[品种1]（17 ± 0.4吨/英亩）封存的二氧化碳当量排放量最高，其次是[品种2]（10 ± 0.2吨/英亩）和[品种3]（9 ± 0.5吨/英亩）品种带。[品种4]（7 ± 0.2吨/英亩）和[品种5]（7 ± 0.1吨/英亩）品种带封存 的二氧化碳当量排放量最低。在1.5岁时，草种已完全生长，但[草种1]和[草种2]每英亩地上碳储量分别仅为0.51 ± 0.0吨和0.47 ± 0.0吨。草种封存的二氧化碳当量排放量：[草种1]（1.9 ± 0.0吨/英亩）和[草种2]（1.7 ± 0.0吨/英亩）也低于农林业树苗。从这项研究来看，建议选择木材生物量较高且生长速度快的农林业物种用于封存二氧化碳排放。
