河西走廊萵筍膜下滴灌灌溉制度研究

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Abstract：Toexplore theoptimal irigationregimeforlettuce under mulcheddrip irigation inte Hexi Corridorof Gansu province，this studyadoptedtwo-factor experimental design with ninecombinations ofdrip irrigation frequency（D1： 4d， D2： 6 d，D3： 8 d） and irrigation quota（W1： 75m3?hm-2?time-1 ，W2： 105m3?hm-2?time-1 W3： 135m3?hm-2?time-1） . The synergisticeffctsoftesefactorsonletueappearancequalityutritionalqualityyield，andiigatiowaterseeciency（IWUE）were systematically analyzed.The CRITIC method wasused to quantify appearance and nutritional quality indicators，whilethecoeficientofariationmethodasignedweights toappearancequalityutritionalqualityyield，and IWUE.A multi-criteria comprehensive evaluation was conducted using the TOPSIS model.The results showed that high and medium frequencyirrigation（D1/D2）and highquota irigation（W3）could significantlyincrease thestemdiameter， stem length，single plant mass and yield of lettuce.The D2W3 treatment achieved the highest yield of 78.15t?hm-2 ，anincrease of 62.9% compared to D3W1.The D3W1 treatment significantly increased soluble sugar content，soluble protein content and vitamin C content，which increased by 50.8% ， 7.5% and 18.8% ，respectively，compared with D1W3，the nitratecontent also significantlyincreased by 122.8% comparedwithD1W3，reaching 251.1mg?kg-1 .IWUEofD2W1was the highest （55.31kg?m-3） ， 67.8% higher than that of D1W3.The comprehensive evaluation results of TOPSIS showed thatD2W3 treatment（6d drip irrigation frequency- -135m3?hm-2?time-1 irrigation quota）had the highest comprehensive similarity degree（ Ci=0.784 2， ，considering high yield，good quality and water saving，so it was recommended as the optimal irrigation system of lettuce under mulched drip irrigation in Hexi Corridor of Gansu province.

Key words： Lettuce;Mulcheddrip irigation; Drip irigation frequency;Irrigationquota; CRITIC-TOPSIS method

莖用萵苣（Lactuca sativaL.var.asparaginaBailey）又稱萵筍，是菊科萵苣屬一年或二年生草本植物，其肉質(zhì)莖富含維生素、礦物質(zhì)及萵苣苦素等成分，具有抗癌、抗氧化等功效[，廣泛栽培于我國南北各地[3-4]。（剩余13015字）