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Comparative assessment of temporal changes in soil degradation under four contrasting land‐use options along a tropical toposequence
Land Degradation & Development ( IF 3.6 ) Pub Date : 2019-12-22 , DOI: 10.1002/ldr.3461
Cornelius I. Alarima 1, 2 , Ebenezer Annan‐Afful 3 , Sunday E. Obalum 4, 5 , Joseph M. Awotunde 1 , Tsugimasu Masunaga 2 , Charles A. Igwe 4 , Toshiyuki Wakatsuki 2, 5
Affiliation  

Assessment of land‐use types has conventionally been on spatial rather than temporal scales, thus limiting the inference on relative potential of land‐use types against soil degradation, needed to validate their allotment to ecosystems on agricultural watersheds. The study assessed the changes in key indices of soil degradation among four land‐use systems of West African 'watershed' agroforestry development over about a decade (1999–2011) along a toposequence in Central Ghana. The land‐use systems were grass‐dominated natural fallow (Fallow), cocoa plantation (CPT), traditional rice farm (TRF), and Sawah ecotechnology for wet inland valley rice farm (Sawah), with sampled land areas covering 2,000, 1,500, 4,500, and 6400 m², respectively. In 1999 and 2011, soil samples were taken from 0–20, 20–40, and 40–60‐cm depths. Samples were collected from about the same spots in both years. The samples were analyzed for selected physicochemical parameters and, for each land‐use option and depth, comparison made between 1999 and 2011. A mean‐weighted decadal change in degradation status was used to rank the land‐use options. Most of the decadal changes in soil properties (including available micronutrients) were negative, with about two‐third of the significant changes in the top (0–20 cm) soils. For instance, soil pH tended to decrease in 2011 compared with 1999; the decreases (14.51%) were significant in the topsoils under Sawah where no other index showed significant decline. Topsoil total carbon decreased under TRF (49.08%) and CPT (32.80%). Available phosphorus marginally increased only under Sawah. The overall aggregate scores for the mean‐weighted decadal change in degradation status showed that the land‐use options differed in their potential to resist degradation: Sawah (slight), Fallow (mild), and TRF/CPT (moderate). Our findings highlight the extent of temporal changes in soil degradation under different topo‐positions in tropical African ecosystems while pointing to the superiority of Sawah ecotechnology. Increased use of this soil‐and‐water management system in lowland rice farming could, therefore, have some soil conservation benefits.

中文翻译:

沿热带地形序列的四种不同土地利用方案下土壤退化时间变化的比较评估

土地利用类型的评估通常是在空间而不是时间尺度上进行的,因此限制了对土地利用类型对土壤退化的相对潜力的推断,需要验证它们对农业流域生态系统的分配。该研究评估了西非“流域”农林业发展的四个土地利用系统在大约十年(1999-2011 年)沿加纳中部的一个地形序列中土壤退化的关键指标的变化。土地利用系统为以草为主的自然休耕 (Fallow)、可可种植园 (CPT)、传统稻田 (TRF) 和湿内陆河谷稻田 (Sawah) 的 Sawah 生态技术,采样土地面积覆盖 2,000、1,500、分别为 4,500 和 6400 平方米。1999 年和 2011 年,土壤样本取自 0-20、20-40 和 40-60 厘米深度。在这两年中,样本是从大致相同的地点收集的。对样品的选定物理化学参数进行了分析,并针对每个土地利用选项和深度,在 1999 年和 2011 年之间进行了比较。退化状态的平均加权十年变化用于对土地利用选项进行排序。土壤性质(包括有效微量营养素)的大部分十年变化是负面的,其中约三分之二的显着变化发生在表层(0-20 厘米)土壤中。例如,与1999年相比,2011年土壤pH值呈下降趋势;在 Sawah 下的表土中,下降 (14.51%) 是显着的,没有其他指数显示出显着下降。表土总碳在 TRF (49.08%) 和 CPT (32.80%) 下减少。有效磷仅在 Sawah 下略有增加。退化状态的平均加权十年变化的总体总分表明,土地利用选项在抵抗退化的潜力方面有所不同:Sawah(轻度)、休耕(轻度)和 TRF/CPT(中度)。我们的研究结果突出了热带非洲生态系统中不同地形下土壤退化的时间变化程度,同时指出了 Sawah 生态技术的优势。因此,在低地水稻种植中更多地使用这种水土管理系统可能会带来一些土壤保护效益。我们的研究结果突出了热带非洲生态系统中不同地形下土壤退化的时间变化程度,同时指出了 Sawah 生态技术的优势。因此,在低地水稻种植中更多地使用这种水土管理系统可能会带来一些土壤保护效益。我们的研究结果突出了热带非洲生态系统中不同地形下土壤退化的时间变化程度,同时指出了 Sawah 生态技术的优势。因此,在低地水稻种植中更多地使用这种水土管理系统可能会带来一些土壤保护效益。
更新日期:2019-12-22
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