干旱区生态环境知识资源中心(Arid): Impact of land use type and altitudinal gradient on topsoil organic carbon and nitrogen stocks in the semi-arid watershed of northern Ethiopia

Arid

DOI	10.1016/j.heliyon.2021.e06770
	Impact of land use type and altitudinal gradient on topsoil organic carbon and nitrogen stocks in the semi-arid watershed of northern Ethiopia
	Seifu, Weldemariam; Elias, Eyasu; Gebresamuel, Girmay; Khanal, Subodh
通讯作者	Seifu, W (corresponding author), Salale Univ, Coll Agr, Dept Hort, POB 245, Fiche, Ethiopia. ; Seifu, W (corresponding author), Addis Ababa Univ, Coll Nat & Computat Sci, Ctr Environm Sci, Addis Ababa, Ethiopia.
来源期刊	HELIYON
EISSN	2405-8440
出版年	2021
卷号	7 期号:4
英文摘要	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.
英文关键词	Ayiba watershed Elevation gradient Ethiopia Carbon/nitrogen stock Land-use
类型	Article
语种	英语
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000647560300012
WOS关键词	SOIL CARBON ; SPATIAL VARIABILITY ; LOESS PLATEAU ; ELEVATION GRADIENT ; SLOPE POSITION ; MATTER ; SEQUESTRATION ; LANDSCAPE ; RIVER ; MANAGEMENT
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368878
作者单位	[Seifu, Weldemariam] Salale Univ, Coll Agr, Dept Hort, POB 245, Fiche, Ethiopia; [Seifu, Weldemariam; Elias, Eyasu] Addis Ababa Univ, Coll Nat & Computat Sci, Ctr Environm Sci, Addis Ababa, Ethiopia; [Gebresamuel, Girmay] Mekelle Univ, Dept Land Resources Management & Environm Protect, POB 231, Mekelle, Ethiopia; [Khanal, Subodh] Tribhuvan Univ, Inst Agr & Anim Sci, Dept Soil & Environm Sci, Kirtipur, Nepal
推荐引用方式 GB/T 7714	Seifu, Weldemariam,Elias, Eyasu,Gebresamuel, Girmay,et al. Impact of land use type and altitudinal gradient on topsoil organic carbon and nitrogen stocks in the semi-arid watershed of northern Ethiopia[J],2021,7(4).
APA	Seifu, Weldemariam,Elias, Eyasu,Gebresamuel, Girmay,&Khanal, Subodh.(2021).Impact of land use type and altitudinal gradient on topsoil organic carbon and nitrogen stocks in the semi-arid watershed of northern Ethiopia.HELIYON,7(4).
MLA	Seifu, Weldemariam,et al."Impact of land use type and altitudinal gradient on topsoil organic carbon and nitrogen stocks in the semi-arid watershed of northern Ethiopia".HELIYON 7.4(2021).