Studies On High-Yielding Ecological Environment Mechanism Of Super Wheat

This article takes common wheat cultivars as control ,and takes super wheat cultivar Yumai 66 as tested cultivar. There is a series of research on high-yielding ecological environment mechanism from the relation between the colonial structure, light, temperature, relative humidity and other ecology factors and Yumai 66's development ,growth and yield.The main results are as follows.1.There is a clear difference about colonial canopy architecture character and LAI in different growth stage between different spike cultivar .Photosynthesis organ of Yumai 66 is reasonably distributed ,the utilization ratio of light energy is higher and the higher LAI is beneficial to its yield in grain-filling stage . Yumai 66 is a typical vertical leaf type cultivar, and has a larger leaf area than common wheat cultivars. Its angle between stem and leaf and angle index are smaller. Most of photosynthesis surface area of leaf are less shaded .In addition stem sheath and abnormal leaf are also important photosynthesis organ . Yumai 66 has larger spike and latter stem . Its stem sheath and photosynthesis surface area of spike take 51.89% of whole photosynthesis surface area. But comparing to common cultivars the percentage is the highest . The part of photosynthesis surface area are the best part of receiving light state . Therefore , from the utilization ratio of light energy, the distribution of Yumai 66's stem > leaf, spike is better ideal wheat cultivar.Density shows obviously regulating effect on super wheat angle index. With the increase of colony density ,the angle between stem and leaf and angle index have decreased trend.2.Light is the leading ecology factor that influences wheat production . Yumai 66 has higher light tansmission of canopy,lower ECL (extinct coefficient of light ) and more PARPS (photosynthetically active radiation received by per stem ) during mid to late growth stage , which made the middle and lower leaves get enough photosynthetically active radiation and the leaf function stage extends . All of these are the important ecology foundations on high yield . But the radiation intensity of the canopy foundation and the light losses are contradictary . The relation between them should be adjusted by density > fertilizer and irrigation . The increase of density results in the decrease of rediation intensity,decrease of light tansmission , increase of ECL and colony light interception.But the light reception per stem decreases .Concerning colony radiation transmission characteristic and comparing the influence of Dl and D2 on yield, Yumai 66 is better to choose Dl cultivated density(419,000 basic seedling /667m2).3. Yumai 66 improves colony photosynthetically active radiation , adjusts43temperature arid humidity ,increases airflow exchange and substance circulation .4.Comparing to ordinary cultivar, Yumai 66 has more cultivated density .more function leaf area .Although taking higher cultivated density ,result in powerful resistance ,YUMAI 66 still grows normally and get higher yield with powerful resistance.lt is Yumai 66's powerful resistance that makes colony density can increase much ,and with more function leaf area and photosynthetical organ ,so it is the leading reason of high yield.