| 摘要: |
| 【目的】研究EN-1固化剂、N肥及土壤体积质量对黑麦草生长和水分利用效率的影响，为提高黄土边坡植物生物量提供理论依据。【方法】以黄土边坡常见植物黑麦草为研究对象，利用盆栽试验，研究黄土地区典型土壤黄绵土不同土壤体积质量（1.2，1.3，1.4 g/cm3）、EN-1固化剂用量（（以干土质量计）0，0.05%，0.10%，0.15%，0.20%）、N肥（0，100，200，300 mg/kg）处理对黑麦草生长及水分利用效率的影响。【结果】固化剂EN 1对黑麦草株高、根表面积和根径等影响显著，且均呈先增后减的趋势，但与固化剂用量不成正比；随着N肥水平提高，黑麦草株高、生物量、根长、根表面积逐渐提高，但不同N肥水平间差异不显著；随着土壤体积质量增加，黑麦草株高、总生物量、根长、根表面积等均呈下降趋势，但在中（1.3 g/cm3）、低（1.2 g/3）土壤体积质量条件下差异不显著。土壤体积质量1.3 g/3、N肥用量200 mg/kg、固化剂用量0.15%处理黑麦草根生物量最大，土壤体积质量1.2 g/3、N肥用量200 mg/kg、固化剂用量0.10%处理黑麦草总生物量最大。随固化剂用量增加，黑麦草水分利用效率逐渐提高，土壤体积质量1.3 g/3、N肥用量200 mg/kg、固化剂用量0.15%处理黑麦草的WUE最高。黄土边坡生态防护要兼顾土体稳定与植被生长，以土壤体积质量为1.3 g/3，固化剂用量为0.15%较适宜，N肥用量应根据土壤性质等综合确定。【结论】适当的EN-1固化剂用量可以在提高黄土边坡土壤稳定的同时实现边坡的植被生态防护。 |
| 关键词: 土壤固化剂EN-1 黄土边坡 黑麦草 根系特征 水分利用效率 |
| DOI： |
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| 基金项目:中国科学院水利部水土保持研究所创新培育方向项目“水土保持工程关键技术研发与集成” |
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| Effects of EN-1 stabilizer,nitrogen fertilizer and soil bulk density on growth and water use efficiency of ryegrass |
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LIU Yue-mei,ZHANG Xing-chang
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| Abstract: |
| 【Objective】Effects of EN-1 stabilizer,nitrogen fertilizer (N) and soil bulk density on growth and water use efficiency (WUE) of ryegrass were studied to improve the plant biomass of Loess slope.【Method】 Taking ryegrass,a common plant in Loess slope as objective,the effects of different soil bulk densities (1.2,1.3,1.4 g/cm3),stabilizer contents (0,0.05%,0.10%,0.15%,0.20%) and N supplement amounts (0,100,200,300 mg/kg) on growth and WUE of ryegrass were studied by pot experiment.【Result】Stabilizer content had significant effects on height,root area and root diameter of ryegrass,and they all disproportionately increased first followed by decrease as the increase of stabilizer content.Height,biomass,root length and root area of ryegrass gradually increased as the increase of N,while they all gradually decreased as the increase of soil bulk density,and the differences were not significant when density was low.Biomass of ryegrass reached the highest when soil bulk density was 1.3 g/cm3,N was 200 mg/kg and EN-1 stabilizer content was 0.15%,while the total biomass reached the peak value when they were 1.2 g/cm3,200 mg/kg and 0.10%,respectively.Effect of stabilizer on WUE of ryegrass was not significant.The highest WUE was obtained when soil bulk density was 1.3 g/cm33,N was 200 mg/kg and EN-1 stabilizer content was 0.15%.Protection of Loess slope ecology should consider both soil stability and growth of planation.Soil bulk density of 1.3 g/cm3 and stabilizer content of 0.15% were suitable for Loess soil.N supplement should be based on soil properties.【Conclusion】 Proper use of EN-1 stabilizer can achieve vegetation protection and improve stability of Loess slope. |
| Key words: soil stabilizer Loess slope ryegrass root characteristics WUE |
