基于主成分分析的油葵微咸水调亏灌溉灌水效果评价

Evaluation of Regulated Deficit Irrigation Performance with Saline Water Based on Principal Component Analysis

以高油酸含量的油用向日葵为试验材料,应用主成分分析方法将各评价指标的加权和作为微咸水灌水效果的综合主成分指标,并利用该指标评价和分析灌水效果。结果表明,灌水效果综合主成分可以代表93.29%的灌水效果变异信息,且服从正态分布,具有较好的代表性与客观性,可用于油葵微咸水调亏灌溉的评价。河套灌区油葵微咸水灌溉的临界矿化度为3.5 g/L,最适宜进行水分亏缺的时期为现蕾期。当微咸水矿化度处于较低水平时(<3.5 g/L),微咸水调亏灌溉对油葵产量与品质的影响较小。当微咸水矿化度达到3.5 g/L时,最为适宜的灌溉制度为现蕾期灌80%充分灌溉的灌水定额,其他生育期充分灌溉。

In order to find optimal regulated deficit irrigation scheduling with saline water for better oil quality,higher yield and safer management of high oleic oil sunflower,a pot experiment was conducted and the principle component analysis method was used to establish a comprehensive irrigation quality index of saline water by the weighted sum of different evaluation indices. Then,this index was applied to evaluate and analyze the performance of saline water deficit irrigation effect. The results showed that comprehensive irrigation quality principle component obeyed normal distribution significantly, and included 93. 29% primordial quality attribute variation information with better representation and objectivity,and thus it could be used as the overall oil sunflower regulated deficit irrigation with saline water evaluation index. The critical concentration of saline water for oil sunflower in Hetao Irrigation District is 3. 5 g / L,and the most suitable period of water deficit is the floral initiation stage. When the concentration of saline water is low( less than 3. 5 g / L),the regulated deficit irrigation with saline water has less effect on the yield and quality of oil sunflower. When the concentration is 3. 5 g / L,irrigation scheduling with mild deficit( 80% I) in floral initiation stage and 278. 28 mm water amount during the total growth period should be the optimal irrigation pattern for saline water of regulated deficit irrigation with the coordinated yield and quality of oil sunflower.