不同类型砾石覆盖对土壤水分蒸发的影响

Effects of Different Kinds of Gravel Covering on Soil Evaporation

为了探求宁夏中部干旱区最适宜的硒砂瓜覆砂粒径,以宁夏中卫南山台地区天然砂石为试材,采用蒸发器整体称重法,研究了不同类型砾石覆盖对土壤水分蒸发的影响。结果表明:不规则砾石覆盖处理的土壤日蒸发量显著高于卵石和片石,而卵石和片石覆盖处理下的土壤日蒸发量平均值差别较小,未达到显著水平。这表明规则砾石对土壤水分蒸发的抑制效果比不规则砾石的要好。相关性分析结果表明:不同类型砾石覆盖处理的累积蒸发量可以用多项式方程Y=at2+bt+c来模拟,相关系数大于0.95。

In order to explore the most suitable type of gravel covering for selenium sand melon in dry areas of middle Ningxia, this research used the natural gravels from Nanshantai region in Zhongwei city, Ningxia, as test materials, and utilized evaporator overall weighing method to study the effects of different kinds of gravel covering on soil water evaporation. The results showed that the daily evaporation capacity of the soil covered by irregular gravels was significantly higher than those of the soils covered by pebble and flaky, while the daily evaporation capacities of pebble and flaky cover treatments were almost the same without significant difference, which indicated that the evaporation suppression effect of regular gravels was better than those of irregular ones. Correlation analysis results showed that cumulative evaporation capacity of different kinds of gravel covering could be simulated with the polynomial equation Y=at^2＋bt＋c and the correlation coefficient was larger than 0.95.