| 摘要: |
| 【目的】研究高速公路绿化带边坡的土壤水分动态变化规律，旨在为高速公路生态绿化提供参考。【方法】2009年4-11月对河北固安县廊涿高速各观测点（阳坡、阴坡、平地及中央隔离带）不同土层深度（0～40 cm）含水量及降雨量进行连续观测，分析了高速公路绿化带土壤水分的动态变化规律。【结果】4-5月，各观测点土壤含水量持续下降；5-8月，各观测点土壤含水量迅速增加，并保持在较高水平；8-10月，各观测点土壤含水量逐渐降低；10-11月，各观测点土壤含水量稳中有升。各观测点表层（0～10 cm）和下层(10～20 cm)的土壤含水量波动较大，变异系数平均值为28.39%和24.85%，深层（20～40 cm）土壤含水量的变化明显减弱，变异系数平均值为19.41%。在0～40 cm土层，中央隔离带的土壤含水量较高，阴坡和阳坡次之，平地最低。【结论】高速公路边坡土壤水分的季节性动态变化规律显著，且与降雨规律一致。5-10月的土壤水分条件最好。土壤水分的空间变化可分为速变层（0～20 cm）和活跃层（20～40 cm）2个层次。各观测点中，中央隔离带的土壤水分条件最好，阴坡和阳坡次之，平地土壤水分条件最差。 |
| 关键词: 土壤水分 动态变化 高速公路边坡 |
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| 基金项目:林业公益性行业科研专项“建设工程损毁林地植被修复关键技术研究与示范”(200904030)；河北省廊涿高速公路管理处项目“廊涿高速中央分隔带绿化植物选择与栽培技术咨询” |
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| Dynamic variation of soil moisture in highway greenbelt |
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LUO Han,SHI Chang-qing,TIAN Jia,et al
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| Abstract: |
| 【Objective】This study studied the dynamic variation of soil moisture in highway greenbelt to improve the ecological greening for highway.【Method】Through the continuous observation of soil moisture (0-40 cm) and rainfall at sunny slope,shady slope,flat ground and central isolation belt in Langzhuo highway,the dynamic variations of soil moisture in highway greenbelt were analyzed.【Result】From April to May,the soil moisture continuously decreased at each observation site.From May to August,the soil moisture increased rapidly and maintained a high level at each observation site.From August to October,the soil moisture decreased gradually.From October to November,the soil moisture kept steadily.The soil moistures of surface layer (0-10 cm) and lower layer (10-20 cm) fluctuated significantly with averaged variation coefficients of 28.39% and 24.85%,respectively.The fluctuation of soil moisture at deep layer (20-40 cm) was weak with averaged coefficient of 19.41%.Soil moisture in soil layer (0-40) of central isolation belt was the highest followed by sunny slope and shady slope,and flat ground had the lowest value.【Conclusion】Seasonal variation of soil moisture in highway greenbelt was significant and in consistent with rainfall.From May to October,the soil moisture content was the best.Spatial variations of soil moistures could be divided into two levels:a quick change layer (0-20 cm) and an active layer (20-40 cm).Central isolation belt had the best soil moisture condition,followed by shady slope and sunny slope,while flat ground had the worst. |
| Key words: soil moisture dynamics variation highway slope |
