干旱区生态环境知识资源中心(Arid): Geomorphological controls on soil fertility of semi-arid alluvial fans: A case study of the Joghatay Mountains, Northeast Iran

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DOI	10.1016/j.catena.2019.01.016
	Geomorphological controls on soil fertility of semi-arid alluvial fans: A case study of the Joghatay Mountains, Northeast Iran
	Bahrami, Shahram 1; Ghahraman, Kaveh 2
通讯作者	Bahrami, Shahram
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2019
卷号	176 页码:145-158
英文摘要	Alluvial fans are ideal locations to examine the effect of geomorphic processes and landforms on the soil characteristics. The rate of soil development and fertility differs between active surfaces, exposed to aggradation, and old or relict surfaces, subject to degradation. The aim of this research is to evaluate the effect of landforms and processes on soil fertility based on the studies on three alluvial fans of different ages (relict, old and young). A total of 36 soil samples were collected from these three alluvial fan surfaces. The samples were gathered from different locations of fans (apex and toe) and landforms (gully beds, interfluves, swales, and bars) and for each sample, nine variables including soil texture, acidity (pH), electrical conductivity (EC), total neutralizing value (TNV), available phosphorus (AP), available potassium (AK), total nitrogen (TN), total organic carbon (TOC), and hydraulic conductivity (K) were measured. The results show that the values of TNV, AP, AK, TN and TOC increase as clay% increases. In the relict and old fans, the values of TNV, TOC, TN, AP, AK, clay%, and silt% are higher in the interfluves than in the gully beds. Also, in the relict and old fans, the rates of clay%, silt%, TOC, TN, and AP are higher in the apexes than in the toes. In the young fan, the values of most variables are higher in the toe compared to the apex. The wide and relatively flat interfluves of the apex of old and relict fans have soils that are more fertile compared to the extensively entrenched surfaces of relict and old fan toes with relatively steep sloped interfluves. The less fertile soils in the apex of young fan can be attributed to its coarse-textured soils and also to repeated flooding and depositional processes. Overall, this study reveals that geomorphological landforms and processes such as aggradation and degradation play an important role in the spatial variation of soil fertility.
英文关键词	Landform Relict fan Interfluve Gully Degradation
类型	Article
语种	英语
国家	Iran
收录类别	SCI-E
WOS记录号	WOS:000462107000012
WOS关键词	ELECTRICAL-CONDUCTIVITY ; LAND SUBSIDENCE ; CLAY MINERALOGY ; GEOMORPHIC SURFACES ; SPATIAL VARIABILITY ; MANAGEMENT ZONES ; MOJAVE DESERT ; VALLEY ; LANDFORMS ; POTASSIUM
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214829
作者单位	1.Shahid Beheshti Univ, Sch Earth Sci, Dept Phys Geog, Tehran, Iran; 2.Hakim Sabzevari Univ, Fac Geog & Environm Sci, Dept Phys Geog, Sabzevar, Iran
推荐引用方式 GB/T 7714	Bahrami, Shahram,Ghahraman, Kaveh. Geomorphological controls on soil fertility of semi-arid alluvial fans: A case study of the Joghatay Mountains, Northeast Iran[J],2019,176:145-158.
APA	Bahrami, Shahram,&Ghahraman, Kaveh.(2019).Geomorphological controls on soil fertility of semi-arid alluvial fans: A case study of the Joghatay Mountains, Northeast Iran.CATENA,176,145-158.
MLA	Bahrami, Shahram,et al."Geomorphological controls on soil fertility of semi-arid alluvial fans: A case study of the Joghatay Mountains, Northeast Iran".CATENA 176(2019):145-158.