Abstract
This paper analyzed the water-retention mechanism of feldspathic sandstone (fine- (< 1 mm diam.) and gravel-sized (2–3 cm diam.) in Mu Us Sandy Land, Northwest China. The objective of this study is to study the effect of feldspathic sandstone amendment on water retention in sandy land. The results showed that as the proportion of fine feldspathic sandstone in the sandy land soil increased, the soil texture changed from sand to silt loam, the capillary porosity gradually increased from 26.3% to 44.9%, and the soil saturated hydraulic conductivity decreased from 7.10 mm/min to 0.07 mm/min. Feldspathic sandstone gravel formed micro-reservoirs in the sandy land soil, playing the role of a ‘water absorbent’ and ‘water retaining agent’ in sandy land. Amendment with feldspathic sandstone can increase water retention in the arable layer of sandy land by 67%. This study provides a theoretical basis for the amelioration of sandy land on a large scale. It can be concluded that amendment with feldspathic sandstone can improve the physical properties of sandy land soil and increase soil water retention.
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Foundation item: Under the auspices of Key Direction Program of Chinese Academy of Science (No. KZCX2-YW-Q06-03), Major State Basic Research Development Program of China (No. 2009CB421103), National Natural Science Foundation of China (No. 41001050), Major Science and Technology Program for Water Pollution Control and Treatment (No. 2012ZX07201004)
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Han, J., Xie, J. & Zhang, Y. Potential role of feldspathic sandstone as a natural water retaining agent in Mu Us Sandy Land, Northwest China. Chin. Geogr. Sci. 22, 550–555 (2012). https://doi.org/10.1007/s11769-012-0562-9
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DOI: https://doi.org/10.1007/s11769-012-0562-9