温光条件对冬茬黄瓜地上部生长发育及产量形成的影响

Effects of Temperature and Illumination on Growth of Overground and Yield Forming of Winter Cucumber

本试验连续两年观测了冬茬黄瓜生育期间的温度、光照变化以及黄瓜生长发育动态和产量形成规律。结果表明：受低温弱光影响，冬茬黄瓜植株节间长，叶片分布稀疏，叶面积受人为落蔓作用呈波动式变化；结果期间叶面积指数为１～２．４０。１２月中旬至元月中旬黄瓜果实长成时间平均２７．９天，日增长量仅４．８１ｇ，至４月上旬果实生长量为深冬的３倍。投影寻踪回归分析表明，日照时数、日总辐射量和有效积温对冬茬黄瓜产量影响最大，地温大于气温对产量的影响。

Winter cucumber has been observed on temperature, illumination, growth andyield forming for 2 years. The results show that under weak illumination and after artificallowing stem into place, the leaf area of a single plant of winter cucumber has wavy change,the leaves are scattered rarely and the leaf nodes are longer. The leaf area index is 1￣2. 4during fruiting season. The fruit of cucumber needs average of 27. 9 days for growing sincethe second ten days of December to the second ten days of January. Increased production capacity is only 4. 81g/day and it increases to 3 times in the first ten days of April. Projectionpursuit regressive (PPR) analysis shows that the yield of winter cucumber is affected mainlyby sunshine time, solar radiation total dosage and effective accumulative temperature. Thenthe influence of soil temperature is higher than the air temperature.