中国地理科学(英文版) ›› 2012, Vol. 22 ›› Issue (5): 550-555.

• 论文 • 上一篇    下一篇

Potential Role of Feldspathic Sandstone as a Natural Water Retaining Agent in Mu Us Sandy Land, Northwest China

HAN Jichang1, 2, 3, XIE Jiancang3, ZHANG Yang1, 2, 3   

  1. (1. Shaanxi Province Real Estate Development Corporation, Xi′an 710075, China; 2. Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources of China, Xi′an 710075, China;
    3. Engineering Research Center for Land Consolidation of Shaanxi Province, Xi′an 710075, China)
  • 出版日期:2012-10-05 发布日期:2012-10-09

Potential Role of Feldspathic Sandstone as a Natural Water Retaining Agent in Mu Us Sandy Land, Northwest China

HAN Jichang1, 2, 3, XIE Jiancang3, ZHANG Yang1, 2, 3   

  1. (1. Shaanxi Province Real Estate Development Corporation, Xi′an 710075, China; 2. Key Laboratory of Degraded and Unused Land Consolidation Engineering, the Ministry of Land and Resources of China, Xi′an 710075, China;
    3. Engineering Research Center for Land Consolidation of Shaanxi Province, Xi′an 710075, China)
  • Online:2012-10-05 Published:2012-10-09

摘要:

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.

关键词: feldspathic sandstone, sandy land soil, water retaining agent, Mu Us Sandy Land, soil saturatd hydraulic conductivity

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.

Key words: feldspathic sandstone, sandy land soil, water retaining agent, Mu Us Sandy Land, soil saturatd hydraulic conductivity