Effect of Trees from on Grain Yield and Photosynthetic Characteristics at Different Growth Stage of Wheat under Almond Wheat Intercropping

【Objective】 In this article, effect of tree from on grain yield and and photosynthetic characteristics of winter wheat under intercropping mode were study to provide a theoretical basis for choosing management standards for intercropping system in southern Xinjiang. 【Method】 Use almond-winter wheat intercropping system as research materials, Delayed open-central shape (DC), Open-center shape (OC) , High stem-shape (HS) and Semicircle small-canopy shape (SC) 4 tree structures were taken as the treatment,field conditions were used as control. The components of winter wheat grain yield, photosynthetic characteristics, Chlorophyll and soluble protein content were determined under different treatment. And the correlation between grain yield composition indexes and photosynthetic indexes be analyzed at heading, flower, Grain-filling and milky stage 4 key growth stage. 【Result】 The results showed that in almond winter wheat intercropping system, grain yield, 1,000-grain weight, grain number per panicle and effective panicle per unit area were influenced by both tree from and position. The grain yield of wheat SC >HS > OC > DC , and decreased 18.24%, 33.00%, 35.43% and 63.68%, respectively, compared with the ratio of chlorophyll a/b decreased in both 4 tree from treatments;the maximum net photosynthetic rate(Pmax)of wheat flag leaf at intercropping area with 4 tree from treatments were significantly reduced at flower and grain filling stage, compared with monoculture wheat the decreasing range at flowering stage and grain filling stage was within the range of 18.24%-48.88% and 15.55%-56.38%, respectively. The correlation between Pmax of flag leaf and grain yield, 1,000-grain weight, grain number per panicle and effective panicle per unit area were reached significant levels at heading stage, flowering stage and grain filling stage. 【Conclusion】 In amond winter wheat intercropping system,the decrease of wheat grain yield was closely related to the decrease of flag leaf photosynthetic capacity which caused by intercropping.