| 赵伟霞,张萌,李久生,栗岩峰.基于简易吸水法的喷灌施肥冬小麦冠层截留量[J].水利学报,2020,51(3):335-341 |
| 基于简易吸水法的喷灌施肥冬小麦冠层截留量 |
| Canopy interception of winter wheat under sprinkler fertigation based on wet-absorption method |
| 投稿时间：2019-12-26 |
| DOI：10.13243/j.cnki.slxb.20190912 |
| 中文关键词: 喷灌 施肥灌溉 冠层截留 肥液浓度 株高 冬小麦 |
| 英文关键词: sprinkler fertigation canopy interception fertilizer concentration plant height winter wheat |
| 基金项目:国家重点研发计划专项（2017YFD0201505）；国家自然科学基金项目（51679255）；流域水循环模拟与调控国家重点实验室自由探索课题（SKL2018TS06） |
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| 摘要点击次数: 3929 |
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| 中文摘要: |
| 喷灌施肥时的冠层截留会增加叶片灼伤风险，影响肥料利用效率。为了定量评估喷灌施肥时冬小麦冠层的肥液截留特性，以尿素为研究对象，采用简易吸水法测定了冬小麦拔节-灌浆期不同尿素溶液浓度的冠层截留肥液量和附着肥液当量厚度。结果表明：冬小麦拔节-灌浆期冠层截留肥液量随冬小麦生长显著增加，冠层截留肥液量与植株生态指标显著线性相关，相关程度依次为株高 > 鲜重 > 植株表面积 > 叶面积指数；附着肥液当量厚度在拔节-灌浆期变化相对较小，变化范围为0.051~0.080 mm，均值为0.067 mm。在冬小麦抽穗期和拔节期，不同尿素溶液浓度的冠层截留肥液量和附着肥液当量厚度在p<0.05水平上差异显著。研究提出的冬小麦生育期内冠层截留肥液量与株高的回归方程可用以估算冬小麦生育期内喷灌施肥时的冠层截留肥液量。 |
| 英文摘要: |
| During the sprinkler fertigation,there is a risk of leaf burns and affecting the sprinkler fertilizer utilization efficiency because of the canopy interception. To quantify the canopy interception of winter wheat under sprinkler fertigation, the canopy interception to fertilizer solution and the fertilizer layer thickness adhered by plant were measured using wet-absorption method. This study was conducted at the experimental station of China Institute of Water Resources and Hydropower Research in Daxing District, Beijing City. Five solution concentrations in mass fraction of 0%, 0.030%, 0.092%, 0.162%, and 0.243% were used to measure the effect of fertilizer concentration on canopy interception. The type of fertilizer was urea. The results indicated that the canopy interception to fertilizer solution significantly increased with the growth of winter wheat from jointing stage to filling stage. In the heading stage, there was significant difference about canopy interception to fertilizer solution among urea concentration treatments at a probability level of p<0.05. The rank of relationships between canopy interception to fertilizer solution and plant growth parameters was plant height, fresh weight, canopy surface area, and leaf area index. The fertilizer layer thickness adhered by plant changed small from jointing stage to filling stage, and its average value was 0.067 mm. In the jointing stage, there was significant difference about fertilizer layer thickness adhered by plant among urea concentration treatments at a probability level of p<0.05. As there was significant linear relationship between canopy interception to fertilizer solution and plant height, the linear equation could be used to calculate the canopy interception to fertilizer solution under sprinkler fertigation. |
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