公路边坡不同护坡措施表层土壤水分动态变化规律

发布时间：2018-09-12 13:48

【摘要】：为了确定公路边坡不同护坡措施保水效果,以沈抚高速沿线的草皮防护(CP)、挂网喷播(GW)、六角空心砖防护(LJ)和菱形防护(LX)四种典型边坡防护措施为研究对象,利用土壤水分测量仪观测不同护坡措施的表层土壤含水量,分析不同护坡措施下土壤含水量的时空演变特征。结果表明:不同护坡措施土壤含水量均表现为坡下坡中坡上;土壤含水量均值在13日,14日均表现为CPGWLJLX,而在15日,16日均表现为CPLJGWLX;在同种护坡措施下,土壤含水量变异程度在各坡位均表现为随时间变化呈逐渐增大的规律;在同一坡面情况下,六角空心砖防护坡面表层土壤水分变异系数(CV)表现为坡上坡下坡中,其余三种护坡措施CV均表现为坡上坡中坡下;护坡措施土壤含水量变异程度随时间变化表现为LX(12.5%)GW(10.6%)CP(9.2%)LJ(8.5%),菱形植草与其余三种措施间差异显著(p0.05),挂网植草与六角空心砖防护差异显著(p0.05),草皮防护与这两种措施均未达到显著水平;六角空心砖配合紫穗槐灌木和小火炬草本植被的护坡形式保水效果较好。
[Abstract]:In order to determine the water conservation effect of different slope protection measures on highway slope, four typical slope protection measures such as turf protection (CP), and (GW), hexagonal hollow brick protection (LJ) and rhombus protection (LX) are studied. The surface soil moisture content of different slope protection measures was observed by using soil moisture meter, and the temporal and spatial evolution characteristics of soil water content under different slope protection measures were analyzed. The results showed that the soil moisture content of different slope protection measures was on the middle slope down the slope, the average soil moisture content was CPGWLJLX, on the 13th and 14th day, and the CPLJGWLX; on the 15th and 16th day under the same slope protection measures. The variation degree of soil water content increased with time in each slope, and the coefficient of variation (CV) of surface soil moisture on the same slope protected by hexagonal hollow brick showed that the coefficient of variation of soil water in the upper and lower slope was lower than that in the upper slope. The other three kinds of slope protection measures CV showed that the upper slope was middle slope and the lower slope; The variation degree of soil water content in slope protection measures showed that LX (12.5%) GW (10.6%) CP (9.2%) LJ (8.5%), rhombohedral grass planting and other three measures had significant difference (p0.05), and the difference between net planting and hexagonal hollow brick protection was significant (p0.05). The slope protection of hexagonal hollow brick combined with Amorpha fruticosa shrub and small Torchia herbaceous vegetation has better water conservation effect.
【作者单位】：沈阳农业大学水利学院;
【基金】：辽宁省自然基金“坡耕地不同耕作模式产流产沙规律试验研究”(201102193)
【分类号】：S152.7

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