蒸散视角下护坡植被滴灌技术评价  

Assessment of buried drip irrigation in soil of slope-protection vegetation from evapotranspiration perspective

作　　者：王辰元 周明涛[2,3] 胡旭东[3] 赵同晖 许文年[2,3] Wang Chenyuan;Zhou Mingtao;Hu Xudong;Zhao Tonghui;Xu Wennian(College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China;Hubei Provincial Engineering Research Center of Slope Habitat Construction Technique Using Cement-based Materials(China Three Gorges University),Yichang 443002,China;Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,Ministry of Education,Yichang 443002,China)

机构地区：[1]三峡大学土木与建筑学院,宜昌443002 [2]水泥基生态修复技术湖北省工程研究中心(三峡大学),宜昌443002 [3]三峡库区生态环境教育部工程研究中心,宜昌443002

出　　处：《农业工程学报》2022年第10期85-92,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划项目(2017YFC05049-02);中国华电集团公司科研基金项目(12IJD201800018)。

摘　　要：为探明以复合型人造土壤为边坡种植土的植物蒸散对于高陡边坡生态恢复评价体系制定及水资源利用的重要意义,以黑麦草、高羊茅、早熟禾和“黑麦草+高羊茅+早熟禾”混合草种为研究对象,采用壤中滴灌技术,通过改进后的Penman-Monteith公式研究草本植物实际蒸散量与作物系数,以此评价壤中滴灌技术的生态效益。结果表明:高羊茅的作物实际蒸散量和作物系数最大,黑麦草其次,早熟禾最小,拟合的决定系数不小于0.847;养护初期各植物蒸散量相差较小,均保持在4.2 mm/d左右;养护结束后混合草种的蒸散量最大,早熟禾最小,分别约6.2、5.7 mm/d;养护前20 d,除早熟禾外,黑麦草、高羊茅、混合草种实际蒸散量均差异不显著,养护20 d后黑麦草、早熟禾、混合草种开始发生显著变化;30d后各草种蒸散量均差异不显著;4类草本植物蒸散量差值随时间递增,前期混合草种蒸散量低于黑麦草、高羊茅,后期有明显的提升,50 d起混合草种作物系数大于单草种作物系数。以30 d为界,30 d作物系数相近;生长初期的作物系数变幅最明显,且月增幅随时间呈下降趋势,但黑麦草和高羊茅的作物系数在任意时段均相近。边坡模型试验前期,以坡面喷灌方式灌溉的植物生态值较高,植物生长情况优于壤中滴灌方式,但自养护中期开始,壤中滴灌技术在生态效益上凸显优势,比坡面喷灌技术高出40.7%~1 444.0%的生态值。A vegetation concrete protection has been one of the most widely used technologies for the bare steep slopes in the ecology fields.Among them,the vegetation evapotranspiration can determine the regional distribution of available water resources in the soil-vegetation-atmosphere system.It is also a high demand to evaluate the utilization of water resources for the high-steep slope.In this study,a systematic evaluation was made of the ecological benefit of herbs planted in vegetation concrete under the buried drip irrigation in soil.An improved Penman-Monteith formula was also adopted to calculate the actual crop evapotranspiration(ETc) and the crop coefficient for the herbs,including Lolium perenne L.,Festuca arundinacea,Poa annua L.and the mixed-grass seeds of “Lolium perenne L.+Festuca arundinacea+Poa annua L.” Hence,the experimental materials were prepared,and the slope planting soil was selected as the composite artificial soil.Subsequently,the improved Penman-Monteith formula was established for the slope ecological restoration using the slope coefficient factor,according to the project requirement of ecological slope protection.Specifically,the test grass was sown in the surface layer of the proportioned vegetation concrete that was attached to the slope model,when installing the irrigation equipment.The irrigation system was also designed to ensure the same amount of irrigation per day using the average evapotranspiration of plants and irrigation water utilization coefficient.Moreover,the evapotranspiration test was conducted to balance the water resource for the daily vegetation evapotranspiration to measure.In addition,the equipment for buried drip irrigation in soil and slope sprinkler irrigation were installed on two slope models in fields.The results revealed that the actual evapotranspiration and crop coefficient of Festuca arundinacea were the largest,followed by Lolium perenne L.and the lowest of Poa annua L.All the determination coefficients R2 were not less than 0.847 for the linear fitting of

关 键 词：灌溉 草 蒸散 植被混凝土 PENMAN-MONTEITH公式 壤中滴灌 作物系数 植物生态值 

分 类 号：S271[农业科学—农业水土工程]