干旱区生态环境知识资源中心(Arid): Characterisation of the soil pore system in relation to its hydraulic functions in two South African aeolian soil groups

Arid

DOI	10.1080/02571862.2018.1487594
	Characterisation of the soil pore system in relation to its hydraulic functions in two South African aeolian soil groups
	Mengistu, Achamyeleh G.; Mavimbela, Sabelo S. W.; van Rensburg, Leon D.
通讯作者	Mengistu, AG
来源期刊	SOUTH AFRICAN JOURNAL OF PLANT AND SOIL
ISSN	0257-1862
EISSN	2167-034X
出版年	2019
卷号	36 期号:2 页码:107-116
英文摘要	The characterisation of soil pores has a prime importance in soil hydrology particularly for soil water management in both irrigated and dryland agriculture. Hence, this study describes the soil pore system in the Clovelly and Hutton soil forms and its roles in soil hydrology by quantifying the different functional pore classes. The soil pore size-pore volume (PS-PV) response curve, which shows the relationship between cumulative pore volume to the corresponding pore sizes, was estimated from the soil water retention curve (SWRC) by applying the capillary theory. The SWRC was measured in the laboratory using a hanging water column and pressure plate apparatus. Saturated hydraulic conductivity was determined in situ with a constant head permeameter, whereas unsaturated hydraulic conductivity (K-L) and diffusivity (D-f) were estimated from the SWRC by the van Genuchten conductivity model. The classification of soil pore sizes given in the literature was modified based on the concept of field water capacity. Therefore, pore sizes greater than the drained upper limit (DUL) were classified as transmission pores. Similarly, the pore size between the DUL and the lower limit (LL) were classified as storage pores, and pore sizes smaller than the LL were residuals and bonding pores collectively. Soil water retention increased non-linearly as pore sizes decreased and the opposite was true for K-L and D-f. Generally, macropores were important for water movement, whereas micropores were responsible for water retention. The findings are important for soil water management of cultivated aeolian soils in semi-arid and arid regions of sub-Saharan Africa. The proposed method to classify soil pores on the basis of their function also gives a consistent and realistic value compared with the fixed boundary classes, although the method requires further development.
英文关键词	aeolian soils drained upper limit lower limit pore size distribution pore volume
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000461494600005
WOS关键词	CONDUCTIVITY ; CHALLENGES ; FIELD
WOS类目	Agriculture, Multidisciplinary ; Agronomy
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/333447
作者单位	[Mengistu, Achamyeleh G.; Mavimbela, Sabelo S. W.; van Rensburg, Leon D.] Univ Free State, Dept Soil Crop & Climate Sci, Bloemfontein, South Africa
推荐引用方式 GB/T 7714	Mengistu, Achamyeleh G.,Mavimbela, Sabelo S. W.,van Rensburg, Leon D.. Characterisation of the soil pore system in relation to its hydraulic functions in two South African aeolian soil groups[J],2019,36(2):107-116.
APA	Mengistu, Achamyeleh G.,Mavimbela, Sabelo S. W.,&van Rensburg, Leon D..(2019).Characterisation of the soil pore system in relation to its hydraulic functions in two South African aeolian soil groups.SOUTH AFRICAN JOURNAL OF PLANT AND SOIL,36(2),107-116.
MLA	Mengistu, Achamyeleh G.,et al."Characterisation of the soil pore system in relation to its hydraulic functions in two South African aeolian soil groups".SOUTH AFRICAN JOURNAL OF PLANT AND SOIL 36.2(2019):107-116.