摘要
设置4个遮荫处理,即光照强度的81.3%、57.9%、43.6%和27.8%,以无遮荫处理作常规对照,探究光照条件的改变对冬小麦干物质、产量及品质的影响。结果表明,对冬小麦从拔节期至成熟期长期遮荫,随着光照强度的减小,干物质重、总干物质积累平均速率、穗干重百分比、产量、穗粒数、千粒重、籽粒淀粉和还原糖含量逐渐降低,叶干重百分比逐渐升高。随冬小麦的生长,干物质量的积累增长率呈现出先增大后减小的趋势,干物质积累平均速率也不断增加,到生长后期平均增长速率有所降低。遮荫处理不仅降低了总干物质重,而且影响了冬小麦干物质量在各器官上的分配。各指标中穗粒数对于产量形成的影响最大,其次是千粒重、总干物质重,而成穗数对于产量没有显著性影响。用Logistic函数拟合干物质量积累,用线性函数拟合总干物质重、籽粒淀粉和还原糖含量,以及三次多项式拟合产量,均有较好的相关性。轻度遮荫对各指标影响较小,用拟合函数可以进行不同光照条件下各指标的预测。
4 kinds of shade treatments were set up to reach 81.3% ,57.9% ,43.6% and 27.8% of light intensity,and no shade treatment was recorded as CK,in order to explore the effects of light conditions on dry matter,yield and quality of winter wheat. The results showed that the winter wheat was shaded fi＇om jointing stage to mature period,with the decrease of light intensity,dry matter weight,average dry matter aeeumulation rate, percentage of dry weight of spike, yield,number of spikes, thousand grain weight, starch and reducing sugar content of grain gradually decreased, and the percentage of dry weight of leaf gradually increased.With the growth of winter wheat, the aeeumulation growth rate of dry matter content increased first and then decreased, the average rate of dry matter aeeumulation increased, and the average growth rate decreased at the later stage of growth .The shade treatment not only reduced the total dry matter weight, but also affected the distribution of dry matter quality of winter wheat on the organs. The number of spike in each index has the greatest influenee on yield formation, followed by thousand-grain weight and total dry matter weight, and spike number has no significant effect on yield. The Logistic function was used to fit the mass aeeumulation of dry matter, the linear function was used to fit the total dry matter weight, grain starch and reducing sugar content, and the three polynomial was used to fit yield, all of these had good eon＇elation. Light shading has little influenee on each index, and the fitting function can be used to predict the indexes under different light conditions.
作者
石鹏兵
张建丰
李涛
申亚宾
SHI Peng-bing;ZHANG Jian-feng;LI Tao;SHEN Ya-bin(State Key Laboratotry Base of Eco-hydraulic Engineering in Arid Area,Xi＇an University of Technology,Xi＇an Shaanxi 710048;Shaanxi Key Laboratory of Water Resources and Environment)
出处
《现代农业科技》
2018年第18期5-8,共4页
Modern Agricultural Science and Technology
基金
中国科学院“西部之光”西部青年学者人才培养计划项目(XAB18.716AW06)
陕西省教育厅科研计划项目(16JS084)
关键词
冬小麦
遮荫
干物质
产量
品质
winter wheat
shading
dry matter
yield
quality
