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Organic Carbon Stocks, Dynamics and Restoration in Relation to Soils of Agroecosystems in Ethiopia: A Review

机译:埃塞俄比亚与农业生态系统土壤相关的有机碳储量,动态和恢复:综述

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Soils represent the largest carbon pool and play important roles for carbon storage for prolonged periods in agroecosystems. A number of studies were conducted to quantify soil organic carbon (SOC) worldwide. The objective of this review was to evaluate organic carbon stocks, dynamics and restoration in soils of agroecosystems in Ethiopia. Soil data from 32 different observations, representing four different agroecosystems, were analysed. The mean SOC stocks in the four agroecosystems varied and ranged from 25.66 (sub-humid agroecosystem) to 113.17 (humid mid-highland agroecosystems) Mg C ha -1 up to one meter depth. The trend of mean SOC followed (in descending order): humid mid-highland (113.17 Mg C ha -1 ) > per-humid highland (57.14 Mg C ha -1 ) > semi-arid (25.77 Mg C ha -1 ) > sub-humid (25.66 Mg C ha -1 ). Compared with soils of tropical countries, those in Ethiopian agroecosystems contained low SOC storage potential. This might be associated with differences in measurement and analysis methods as 53.1% of the studies employed the Walkley-Black Method, which is known to underestimate carbon stocks in addition to ecological and management effects. However, shifts of land management from rain-fed to irrigation farming systems exhibited progress in the improvement of mean SOC storage potential. The analyses showed that farming systems involving irrigation sequestered more carbon than rain-fed farm systems. The mean SOC in the various agricultural land uses followed the following trend (in descending order): agroforestry (153.57 Mg C ha -1 ) > grazing land (34.61 Mg C ha -1 ) > cereal cultivation (24.18 Mg C ha -1 ). Therefore, the possible solutions for improvement of organic carbon stocks would be implementation of appropriate restoration strategies based on agroecosystems. INTERNATIONAL JOURNAL OF ENVIRONMENT Volume-6, Issue-1, Dec-Feb 2016/17, page: 1-22.
机译:在农业生态系统中,土壤代表了最大的碳库,并在碳储存中扮演着重要角色。进行了许多研究以量化全世界的土壤有机碳(SOC)。这篇综述的目的是评估埃塞俄比亚农业生态系统土壤中的有机碳储量,动态和恢复。分析了代表四个不同农业生态系统的32个不同观测值的土壤数据。四种农业生态系统中的平均SOC储量变化范围从25.66(亚湿润农业生态系统)到113.17(湿润中高地农业生态系统)Mg C ha -1直至一米深。平均SOC的变化趋势是(按降序排列):湿润中高地(113.17 Mg C ha -1)>湿润高地(57.14 Mg C ha -1)>半干旱(25.77 Mg C ha -1)>亚湿(25.66 Mg C ha -1)。与热带国家的土壤相比,埃塞俄比亚农业生态系统中的土壤具有较低的SOC储存潜力。这可能与测量和分析方法的差异有关,因为53.1%的研究采用了Walkley-Black方法,该方法除生态和管理效果外,还低估了碳储量。然而,土地管理从雨育转向灌溉耕作制度的转变在改善平均SOC储存潜力方面显示出进步。分析表明,涉及灌溉的农业系统比通过雨水灌溉的农业系统吸收更多的碳。各种农业用地的平均SOC呈以下趋势(降序排列):农林业(153.57 Mg C ha -1)>牧场(34.61 Mg C ha -1)>谷物种植(24.18 Mg C ha -1) 。因此,改善有机碳库的可能解决方案将是实施基于农业生态系统的适当恢复策略。国际环境杂志第6卷第1期,2016/17年2月2日,第1-22页。

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