| 引用本文: | 李荣承,万书勤,李晓彬,等.浅埋地下滴灌不同土壤水分调控对苜蓿生长和产量的影响[J].灌溉排水学报,0,():-. |
| lirongcheng,wanshuqin,lixiaobin,et al.浅埋地下滴灌不同土壤水分调控对苜蓿生长和产量的影响[J].灌溉排水学报,0,():-. |
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| 摘要: |
| 摘 要：【目的】制定呼伦贝尔地区苜蓿浅埋地下滴灌灌溉制度。【方法】以紫花苜蓿龙牧806为研究对象，设置5个不同的土壤基质势下限处理，将滴头正下方10 cm深度处不同土壤基质势分别控制在-10、-20、-30、-40 kPa和-50 kPa，研究不同土壤基质势对土壤水分分布、苜蓿生长、产量和灌溉水利用效率的影响。【结果】浅埋地下滴灌条件下，控制滴头正下方10 cm深度处的土壤基质势下限可以显著影响土壤含水率空间分布，当该点土壤基质势阈值越高，0~30 cm土层的土壤含水率越高。苜蓿的株高和产量随着土壤基质势的降低先增加后降低，当土壤基质势下限为-20 kPa时最高。苜蓿的平均灌溉水利用效率随着土壤基质势的降低而升高，当土壤基质势下限在－50~－40 kPa时最高。【结论】为了保证苜蓿的高产、稳产，对于1~3 a生苜蓿，当耕作层土壤保水力较差且土层浅薄时，浅埋地下滴灌条件下滴头正下方10 cm深度土壤基质势下限建议为－20 kPa。 |
| 关键词: 人工草地；浅埋地下滴灌；灌溉制度；土壤基质势；灌溉水利用效率 |
| DOI： |
| 分类号:S275.6；S541 |
| 基金项目:中国科学院战略性先导科技专项课题；中国科学院前沿研究项目 |
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| Effects of Different Soil Moisture Control on Alfalfa Growth and Yield under Shallow Subsurface Drip Irrigation |
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lirongcheng, wanshuqin, lixiaobin, kangyaohu
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Institute of Geographical Sciences and Natural Resources Research
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| Abstract: |
| Abstract:【Objective】To establish an irrigation schedule for alfalfa grassland under shallow subsurface drip irrigation in Hulunbeier area.【Method】Alfalfa Long Mu 806 was used as the research object, and five different treatments with the soil matrix potential thresholds at the depth of 10 cm directly below the emitter were -10, -20, -30, -40 kPa and -50 kPa, to study the effects of different soil matrix potentials on soil moisture distribution, alfalfa growth, fresh grass yield and irrigation water use efficiency.【Result】Under shallow subsurface drip irrigation conditions, controlling the soil matrix potential at a depth of 10 cm directly below the emitter can significantly affect the spatial distribution of soil moisture, when the higher the soil matrix potential threshold was, the higher the soil water content in the 0~30 cm soil layer was. The plant height and fresh grass yield of alfalfa increased first and then decreased with the decrease of soil matrix potential, and the highest plant height and fresh grass yield were gotten when the soil matrix potential was -20 kPa.The average irrigation water use efficiency of alfalfa increased with the decrease of soil matrix potential, and the highest irrigation water use efficiency was achieved when the soil matrix potential was -50~-40 kPa. 【Conclusion】In order to ensure the high and stable yield of alfalfa, for 1~3 years old alfalfa, the soil matrix potential threshold at the depth of 10 cm directly below the emitter under shallow subsurface drip irrigation was recommended to be -20 kPa, when the soil water holding capacity in the tillage layer was poor and the soil layer for alfalfa grow was shallow. |
| Key words: artificial grassland; shallow subsurface drip irrigation; irrigation schedule; soil matrix potential; irrigation water use efficiency |
