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Terrestrial carbon stocks following 15 years of integrated watershed management intervention in semi-arid Ethiopia
Catena ( IF 6.2 ) Pub Date : 2020-03-12 , DOI: 10.1016/j.catena.2020.104543
Tigist Araya Gessesse , Asia Khamzina , Girmay Gebresamuel , Wulf Amelung

Our study investigated the total terrestrial stock of organic carbon and its controlling factors in prevalent land‐use systems in semi-arid Ethiopia (610 mm of annual rainfall), as part of the impact assessment of the national Integrated Watershed Management (IWM) program. Above- and below-ground biomass and soil organic carbon (SOC) stocks of major land-use systems (i.e., exclosure, cropland, rangeland, and bare land) were quantified after field sampling along a topographic gradient. We found that aboveground carbon stocks peaked in the 15-year-old exclosures (9.08 ± 1.44 Mg ha−1) owing to intact woody and grass vegetation as well as substantial litter cover (>20% of the total biomass). Croplands cultivated with wheat and rangelands vegetated with perennial grasses showed average aboveground carbon stocks of 3.16 ± 0.24 and 1.45 ± 0.19 Mg ha−1, respectively. The belowground biomass carbon stock was particularly low in croplands (0.76 ± 0.09 Mg ha−1), exceeded by that in both exclosures and rangelands, where values averaged 3.67 ± 0.06 and 3.04 ± 0.42 Mg ha−1, respectively. The topsoil (0–30 cm) SOC stocks also varied with land-use systems but showed a different order, peaking in rangelands (53.9 ± 10.1 Mg ha−1) and exclosures (41.4 ± 8.1 Mg ha−1), followed by bare lands (29.0 ± 11.5 Mg ha−1) and croplands (26.4 ± 4.6 Mg ha−1). The sub-soils (30–100 cm) added 40% to this SOC storage. The greatest total SOC stock identified in exclosures that had been established primarily on degraded hillslopes may signify a successful restoration effort under the IWM program. However, croplands exhibited the lowest SOC stock, which implies the need for urgent interventions to improve the soil fertility.



中文翻译:

在半干旱埃塞俄比亚进行了15年的集水区综合干预之后,陆地碳储量

作为国家综合流域管理(IWM)计划影响评估的一部分,我们的研究调查了半干旱埃塞俄比亚(每年降雨量为610毫米)流行的土地利用系统中的有机碳总储量及其控制因素。在沿地形梯度进行田间采样后,对主要土地利用系统(即排泄物,农田,牧场和裸地)的地上和地下生物量和土壤有机碳(SOC)储量进行了量化。我们发现,地上碳储量在15年的露头中达到峰值(9.08±1.44 Mg ha -1),因为木本和草木完好无损,并且有大量的凋落物覆盖(占总生物量的20%以上)。用小麦耕种的农田和种有多年生草的牧场的地上平均碳储量分别为3.16±0.24和1.45±0.19 Mg ha -1。农田中地下生物量碳储量特别低(0.76±0.09 Mg ha -1),高于排泄物和牧场的均值,分别为3.67±0.06和3.04±0.42 Mg ha -1。表层土壤(0–30 cm)的SOC储量也随土地利用系统而变化,但表现出不同的顺序,在牧场(53.9±10.1 Mg ha -1)和排泄物(41.4±8.1 Mg ha -1)达到峰值。),其次是光秃秃的土地(29.0±11.5 Mg ha -1)和农田(26.4±4.6 Mg ha -1)。地下土壤(30–100厘米)为该SOC存储增加了40%。主要在退化的山坡上发现的最大SOC总存量可能表示IWM计划成功进行了恢复工作。但是,耕地的SOC含量最低,这意味着需要采取紧急干预措施来提高土壤肥力。

更新日期:2020-03-16
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