田间测定沙地水分运动参数初步研究

摘要/Abstract

摘要： 采用田间垂直入渗试验法测定了沙地水分运动参数, 并得到经验拟合曲线。沙土水分特征曲线表明, 当体积含水率θ>5%时, 吸力S随θ增加而缓慢下降, 而θ<5%时, S随θ的减小而趋于急剧上升。非饱和导水率K~θ关系表明, 当θ>15%时, 导水率K值急剧上升, 而θ<15%时, 导水率K变化缓慢。

关键词: 沙地水分运动参数, 田间垂直入渗试验法, 负压计, 中子水分仪

Abstract: Shapotou Desert Experimental Research Station is situated at the southeastern fringe of Tengger Desert in semi- arid region, with annual rainfall of 186. 2 mm. Neutron probe and tensiometer have been installed to measure soil moisture, soil water suction and potential in soil profile. Soil water movement parameters were obtained in the field by the instantaneous profile method. Soil moisture characteristic curve showed that suction S increases Sharply as volume water content θ decreases below 5%, while S decreases slowly as θ increases above 5%. The relstionships betWeen hydraulic conductivity K and θ showed that K increases sharply with increasing θ when θ15 %, and decreases slowly with decreasing θ when θ 15 %.

Key words: Sandy soil water movement parameter, Instantaneous profile method, Tensiometer Neutron probe

刘元波, 陈荷生, 高前兆, 王新平, 杨诗秀, 雷志栋. 田间测定沙地水分运动参数初步研究[J]. 中国沙漠, 1996, 16(1): 19-23.

Liu Yuanbo, Chen Hesheng, Gao Qianzhao, Wang Xinping, Yang Shixin, Lei Zhidong. PRELIMINARY STUDY ON SOIL WATER MOVEMENT PARAMETER OF SANDY LAND BY INSTANTANEOUS PROFILE METHOD[J]. JOURNAL OF DESERT RESEARCH, 1996, 16(1): 19-23.

田间测定沙地水分运动参数初步研究

PRELIMINARY STUDY ON SOIL WATER MOVEMENT PARAMETER OF SANDY LAND BY INSTANTANEOUS PROFILE METHOD

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