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首页> 美国卫生研究院文献>Heliyon >Impact of land use type and altitudinal gradient on topsoil organic carbon and nitrogen stocks in the semi-arid watershed of northern Ethiopia
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Impact of land use type and altitudinal gradient on topsoil organic carbon and nitrogen stocks in the semi-arid watershed of northern Ethiopia

机译：埃塞俄比亚北部半干旱流域土地利用型和平原梯度对甲虫分水岭的施氮和氮素股

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Understanding the role of soils in the soil organic carbon (SOC) and total nitrogen (TN) cycle is essential, assumed that these parameters are among the key soil quality indicators in a given landscape. Nothing but their status is in a state of continual flux due to land-use, soil management practices, and nature of topographic features. Thus, this study has evaluated the effect of land-use types and altitudinal gradient on SOC and TN concentrations and stocks at a watershed scale in northern Ethiopia. A total of 450 topsoil samples (0–30 cm depth) were collected from four different land-use types (Fig.3) across three elevational categories (Fig.1(b)), and their SOC and TN distributions were studied using descriptive statistics and geostatistical methods. Results revealed significant (p < 0.05) differences in SOC and TN concentrations and stocks by land-use type, elevation, and their interactions. The highest SOC stock was recorded at the lower elevation in GL (7.24 Mg C ha−1), followed by PF (4.65 Mg C ha−1) in the middle and GL (4.61 Mg C ha−1) in the upper elevations, respectively. On the other hand, the lowest SOC stock was observed in the BL areas of the upper (2.34 Mg C ha−1) and middle (2.75 Mg C ha−1) elevations. Spatially, the mean SOC stocks of the different land-uses were in the following order: GL > PF > CL > BL in upper elevation, PF > GL > CL > BL in middle elevation, and GL˃CL in lower elevation, respectively. The estimated total SOC and TN stocks of the study watershed were about 46,868.66 ± 7747.38 Mg C and 7,008.02 ± 441.25 Mg N, respectively. The notable difference is attributable to lack of vegetation cover, unsustainable land-use system, and land degradation via water erosion. Hence, these physical landscape disturbances result in disruption of SOC and TN's storage and stability. The SOC and TN stocks have shown a significant (p < 0.05) negative correlation with soil bulk density in the study watershed. The study concludes that variations in the land-use along topographic gradients drive the soils' SOC and TN storage. Therefore, land suitability planning, soil and water conservation measures, and reforestation practices are needed and practical worth increasing SOC and TN storage in the watershed.
机译：了解土壤的土壤中的有机碳（SOC）和总氮（TN）周期中的作用是必不可少的，假定这些参数之间在给定的景观的关键土壤质量指标。不过他们的地位是由于土地使用连续通量，土壤管理实践和地形特点自然状态。因此，本研究评估了在埃塞俄比亚北部的一个流域尺度土地利用类型和SOC和TN浓度和股票海拔梯度的影响。总共450个表土样品（0-30厘米深度）从四个不同的土地利用类型（图3）在三个正视类别收集（图1（b）中），和它们的SOC和TN分布，使用描述研究统计和地质统计方法。结果显示通过土地使用类型，海拔，和它们之间的相互作用在SOC和TN浓度和股票显著（P <0.05）差异。最高SOC股票被记录在GL下标高（7.24镁ç公顷-1），接着PF（4.65镁ç公顷-1）在中间和GL（4.61镁ç公顷-1）在上部隆起，分别。在另一方面，在上部（2.34镁ç公顷-1）和中间（2.75镁ç公顷-1）隆起的BL区域中观察到最低的SOC的库存。在空间上，不同的土地用途的平均SOC股按以下顺序：GL> PF> CL> BL在上抬高，PF> GL> CL> BL在中间高度和GL˃CL在较低高度，分别。分水岭研究的估计的总SOC和TN股约46,868.66±7747.38镁分别C和7,008.02±441.25镁N，。值得注意的区别是由于通过水的侵蚀缺乏植被覆盖的，不可持续的土地使用制度和土地退化。因此，这些自然景观的干扰导致SOC和TN的存储和稳定性的破坏。 SOC和TN股已显示与分水岭研究土壤堆积密度的显著（P <0.05）的负相关性。这项研究的结论是，在沿着地形坡度土地利用变化驱动的土壤SOC和TN存储。因此，需要土地适宜性规划，水土保持措施和重新造林的做法和实用价值增加的分水岭SOC和TN存储。

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