不同光照强度对苦荞麦主要生物学性状的影响

目的]为提高苦荞麦产量及其栽培技术研究提供参考。方法]以苦荞麦品种7~3为供试材料,从苦荞麦出苗后19 d开始对其进行光照强度为自然光强的100%(CK)、80%、60%、40%遮阴处理,研究不同光照强度对苦荞麦生物学性状的影响。结果]各生育时期苦荞麦株高随光照强度的减弱而增高。在开花结实期和成熟期苦荞麦植株的二级分枝数随光照强度的减弱而减少。现蕾期、开花结实期和成熟期各处理苦荞麦叶片数随光照强度的减弱而降低。随着光照强度的降低,各处理小花数、空粒数、饱粒数、单株粒重和单株生物产量降低,而空粒率增加。结论]在一定程度上,光照强度与苦荞麦株高和叶面积成反比,而与茎粗、二级分枝数、小花数、花序数、叶片数、产量成正比。

Study on the Effects of Different Light Intensity on Main Biological Characteristics of Buckwheat

Objective] The research aimed to provide reference for increasing the yield of buckwheat and studying its cultivation technology.Method] With buckwheat variety 7-3 as tested materials,shading treatments with the light intensity of 100%(CK),80%,60% and 40% of nature light were made on buckwheat after emerging seedlings for 19 d.The effects of different light intensity on the biological characteristics of buckwheat were studied.Result] The plant height in each growth stage was increased with the weakening of light intensity.In blooming and bearing stage and mature stage,secondary branch number of buckwheat plants were decreased with the weakening of light intensity.Leaf number of buckwheat in each treatment in the budding stage,blooming and bearing stage and mature stage were decreased with the weakening of light intensity.With the decreasing of light intensity,floret number,empty-seed number,fullseed number,grain weight per plant and biomass per plant in each treatment were decreased,while the rate of empty seeds was increased.Conclusion] To certain extent,light intensity was inversely proportional to plant height and leaf area in buckwheat,while it was positively proportional to stem width,secondary branch number,floret number,inflorescence number,leaf number and yield.