日光温室西瓜产量影响因素通径分析及水分生产函数

Path analysis of yield components and water production function of watermelon in greenhouse

该文以温室小型西瓜为试材,采用日光温室内E601型蒸发器蒸发量值控制灌溉水量,在西瓜的不同生育阶段设置4个灌水水平,研究不同生长阶段不同土壤水分条件对产量的影响,得出产量与水分之间的函数关系;以株高、茎粗、叶面积指数(LAI)、地上部干质量和根干质量为产量影响因素,通过通径分析方法,计算它们与产量之间的直接通径系数和间接通径系数。结果表明:温室西瓜在滴灌条件下总产量与总耗水量之间呈二次函数关系,最佳灌水量为107mm;水分敏感指数在果实膨大期最大,开花坐果期次之,苗期和成熟期水分敏感指数较低;产量与茎粗、LAI和根干质量之间的单相关系数均达到显著和极显著水平,而茎粗和根系干质量可作为评价小型西瓜高产的单个因素。

With irrigation water amount controlled by E601 type evaporator, the authors studied the effects of different water supply conditions in different growth stages on water production function of mini-watermelon, and calculation directly path coefficient and indirectly path coefficient among plant height, stem diameter, leaf area index （LAI）, shoot dry weight, root dry weight and yield by path analysis method. The experiments included four levers of water supply at different growing stages of mini-watermelon. The results indicated that the relationship between total yield and the total amount of water consumption was quadratic parabola, and the optimal irrigation amount was 107 mm. Water sensitivity index went down successively from fruit spreading growth stage, blossoming and bearing fruits stage, fruit maturing stage and seeding stage. The correlation coefficient between stem diameter and yield, LAI and root dry weight reached significant level and extremely significant level. The stem diameter and root dry weight can be used as evaluation indexes.