| 摘要: |
| 为探明地下滴灌条件下灌水下限与灌水器流量对冬小麦生长的影响，采用3种灌水器流量（0.1、0.9和1.5 L/h）与2种灌水下限（试验地土壤田间持水量的80%和60%）的全因素试验，分析不同试验处理对土壤水分分布及冬小麦生长的影响。结果表明：试验处理下较高流量的地下滴灌灌溉水分下渗量较大，使得40~80 cm土层土壤含水率提高，较小流量的地下滴灌水分主要保存在上层土壤；灌水下限为80%田间持水量较60%田间持水量能够促进冬小麦株高、叶面积指数、干物质积累量和产量的增加，同时能够减缓灌浆期旗叶叶绿素含量的降低；不同灌水器流量处理以0.9 L/h处理冬小麦叶面积指数最高，提高灌水器流量能够减缓灌水下限为60%田间持水量处理下灌浆期旗叶叶绿素含量的降低。综合作物生长、产量及水分利用效率，本试验条件下最优灌溉制度为，灌水下限80%田间持水量，灌水器流量0.9 L/h。 |
| 关键词: 冬小麦 地下滴灌 土壤水分 植株生长 |
| DOI：10.11841/j.issn.1007-4333.2019.11.05 |
| 分类号: |
| 基金项目:科技部国家科技支撑计划（2014BAD12B06） |
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| Effect of lower irrigation limit and emitter flow on winter wheat growth under subsurface drip irrigation |
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SUN Zhanghao1, HUANG Lingmiao1,2, YANG Peiling1, QIU Liuchao1, ZHANG Yanxia1
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1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;2.Management Committee of Xiamen Longyan Shanhai Cooperative Economic Zone, Longyan 364000, China
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| Abstract: |
| To explore the influence of lower irrigation limit and emitter flow on winter wheat growth under subsurface drip irrigation,a full factor experiment was conducted with 3 emitter flow types (0.1,0.9 and 1.5 L/h) and 2 lower irrigation limits (80% and 60% of field capacity in the test site).The effects of different experimental treatments on soil moisture distribution and winter wheat growth were analyzed.The results showed that:The higher flow subsurface drip irrigation had a large amount of water infiltration,which resulted in an increase in soil moisture content in 40-80 cm soil layer.The smaller flow subsurface drip irrigation water was mainly stored in the upper soil.The lower limit irrigation of 80% field capacity,compared with 60% field capacity,promoted the increase of plant height,leaf area index,dry matter accumulation and yield of winter wheat,and reduced the decrease of flag leaf Chlorophyll content during grain filling period.The leaf area index of winter wheat treated with 0.9 L/h under different flow treatments was the highest.Increasing the emitter flow rate could reduce the lowering of the Chlorophyll content under the lower irrigation limit of the 60% field capacity.Considering crop growth,yield and water use efficiency comprehensively,the optimal irrigation system under the conditions of this experiment is the lower limit irrigation of 80% field capacity and irrigation water flow rate of 0.9 L/h. |
| Key words: winter wheat subsurface drip irrigation soil moisture plant growth |
