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当前位置: 首页 > 文章 > 压砂地砂层持水特性研究 土壤通报 2017,48 (2) 319-325
Position: Home > Articles > Water Retention Characteristics of Gravel-sand Stratum on the Gravel-sand Mulched Field Chinese Journal of Soil Science 2017,48 (2) 319-325

压砂地砂层持水特性研究

作  者：
谭军利;王西娜;田军仓;王玉龙;朱勇静
单  位：
宁夏大学土木与水利工程学院;宁夏大学农学院
关键词：
压砂地;砂层级配;入渗速率;含水量;蓄水量
摘  要：
通过田间调查和室内土柱模拟方法,对压砂地砂层级配变化规律及砂层持水特性进行了研究,以探讨压砂地保水蓄水性能随着种植年限增加而下降的机理。结果表明:随着种植年限增加,压砂地砂层中粗粒径的砾石含量下降,而小粒径和细粒径的砂粒含量增加;砂层的持水量增大而平均入渗率呈指数下降。在防止蒸发条件下,灌水后1天10 cm砂层含水量最大值可以达到6.5%,蓄水量最大值和最小值分别为12.5 mm和6.0 mm,分别占灌水量的31.5%和15.2%。影响砂层含水量的主要是粒径为0.315~0.63 mm的砂砾。可见,随着种植年限增加,砂层中砾石含量降低而粗、细砂粒含量增加,进而降低了降雨的入渗速率和提高了砂层的蓄水截留能力,这是导致压砂地土壤保水蓄水性能降低的主要原因。
译  名：
Water Retention Characteristics of Gravel-sand Stratum on the Gravel-sand Mulched Field
作  者：
TAN Jun-li;WANG Xi-na;TIAN Jun-cang;WANG Yu-long;ZHU Yong-jing;Civil and Hydraulic School, Ningxia University;Engineering Research Center of the Ministry of Education for Modern Agricultural Water Resources High Efficiency in Arid Area;Engineering and Technology Research Center of Water-Saving and Water Resource Regulation in Ningxia, Ningxia University;School of Agriculture, Ningxia University;
关键词：
Gravel-sand mulched field;;Gradation of gravel-sand stratum;;Infiltration rate;;Water content;;Water storage
摘  要：
On the gravel-sand mulched field, a field investigation and a soil column experiment were conducted in central arid zone of Ningxia to study the variation of particle gradation and water-holding capacity of gravel-sand stratum. Results showed that the content of coarse particle size gravels in the gravel-sand stratum decreased while that of small and fine particle size sand increased with the increase of planting years. Furthermore, the average infiltration rate of water in the gravel-sand stratum was exponentially declined, and the water-holding capacity was significantly enhanced. In addition, the total infiltration time had a positive correlation with gravel content and had a negative correlation with the particle size of 0.16 mm to 0.315 mm in diameter. The maximum water content in 10 cm thickness gravel-sand stratum was 6.5% after irrigation 1 day under the condition of restraining evaporation with plastic film.The maximum and minimum value of water storage were 12.5 mm and 6.0 mm, which accounted for 31.5% and 15.2%of total irrigation water, respectively. The main factor that influenced water content of gravel-sand stratum was the sand with 0.315-0.63 mm particle size in diameter. It indicated that the gradation of gravel-sand stratum changed with the increase of planting years, which significantly influenced the water infiltration rate and water storage of gravel-sand stratum. As a result, the water-holding capacity and water conserving characteristics of soil under gravel-sand stratum was degrading with the increase of planting years.

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