论文部分内容阅读
对不同年型地膜冬小麦增产内在机制的研究表明，旱地冬小麦全生育期覆膜穴播具有：①明显的抗旱、保水及增产效果，特旱年及旱年最大增产率分别达１５７．６５％和６２．８５％，ＷＵＥ提高４７．５％～１３７．８％和３６．２％～６０．４％；②植株个体、群体发育良好，蒸腾速率增大，光合速率显著提高，合成源扩大；③有利于提高地温，全生育期０～５ｃｍ土层≥０℃地温较露地（２０５６．１℃）提高１０．４％，１ｍ土层根系重量增加０．３％～１３．８６％；④边行优势明显，千粒重和穗粒数分别增加０．３～２．０ｇ和１．３～１４．６粒。
The study on the internal mechanism of winter wheat yield increase in different year types showed that the dry film mulching of winter wheat in dryland had the following characteristics: ① obvious drought resistance, water retention and yield increase, the maximum increase rate was 157.65% and 62.6% .85%, WUE increased by 47.5% -137.8% and 36.2% -60.4%, respectively. (2) Individuals and populations of plants developed well, transpiration rate increased, photosynthetic rate increased significantly, Which is conducive to raising the ground temperature. The soil temperature of ≥0 ℃ in 0 ~ 5cm soil layer during the whole growth period increased by 10.4% compared with the open field (2056.1 ℃), and the root weight increased by 0.3% ~ 13.86% in 1m soil layer. Obviously, 1000-grain weight and grain number increased by 0.3 ~ 2.0g and 1.3 ~ 14.6 grains, respectively.