| There are differences in climatic conditions and production conditions in different wheat production intervals in Henan Province,leading to large differences in the temporal and spatial distribution of yields.There are uncertain factors in high and stable yields.Therefore,it is necessary to accurately grasp the temporal and spatial differences in wheat yield and meteorological factors to clarify the differences.The spatial difference in the contribution of wheat yield components to yield and its causes in production areas are of great significance to the regional layout of wheat in Henan Province,standardized production and further exploration of regional production potential.Using the 2017-2020 field monitoring data from the fixed wheat monitoring station in Henan Province,the geographic information system（GIS）was used to draw the spatial distribution map of the output and output components of the four wheat production areas from 2017 to 2020,as well as the weather in the key growth periods of the wheat production areas Factor spatial distribution graph.Systematic in-depth analysis of the temporal and spatial differences in yield and meteorological factors in different wheat producing areas in Henan Province,as well as the relationship between yield components and yield and their influencing factors.Clarify the temporal and spatial differences,interrelationships,and influencing factors between yield components and yields in different wheat producing areas in Henan Province.In order to guide the precise division of wheat production areas in Henan Province,and provide support and basis for high-yield and stable-yield cultivation.（1）The dynamic analysis of agronomic characteristics in different wheat producing areas showed that the biomass,tiller number and SPAD value of wheat in the northern Henan production area were higher in the later growth period,and the wheat in the middle Henan production area still had a higher LAI in the later growth period.Yield difference is manifested as: yield,ear number and thousand-grain weight are all in northern Henan> central Henan> southern Henan> western Henan,and the number of grains per ear is central Henan> southern Henan> northern Henan> western Henan.The spatial distribution of output is similar to the difference.Among them,the output at the junction of central Henan and southern Henan（Luohe,Zhoukou,Zhumadian,etc.）is relatively high and stable throughout the year.（2）Correlation analysis of yield components and yields in different wheat producing areas shows that the correlations from high to low are as follows: Spike number = Spike grain number> 1000-grain weight in the northern Henan production area,and Spike number> spike grain weight in the middle Henan production area.The number>1000-grain weight,the number of ears>1000-grain weight>the number of grains per ear in the production areas of western Henan and southern Henan,the correlation coefficients are all positive.The direct path coefficients in descending order are as follows: ear number = grain number per ear> thousand-grain weight in northern Henan production area,ear number> grain number per ear> 1000-grain weight in Henan middle and southern Henan production areas,and ear number in western Henan production area.>Thousand-grain weight>Number of grains per spike.The indirect link coefficient shows that the yield components indirectly affect the increase in yield.The effect of increasing the thousand-grain weight in northern Henan,central Henan,and southern Henan is better than increasing the number of grains per ear,while the western Henan production area improves the yield.The number of grains is better.That is to say,the yield components of different production areas have the largest contribution to the number of ears.On the basis of stabilizing the number of ears,the production areas of northern Henan,central Henan and southern Henan should focus on tapping the potential of thousand-grain weight,while the western Henan production areas increase the number of grains per ear.The effect of increasing production is better than the thousand-grain weight.（3）The temporal and spatial distribution of meteorological factors during the key growth period in different wheat producing areas showed that the precipitation during the sowing-overwintering period and overwintering-greening period and the accumulated temperature ≥0°C are mostly expressed as southern Henan> central Henan>western Henan> northern Henan;The precipitation during the green-flowering period is represented by southern Henan>central Henan>western Henan and northern Henan,and the accumulated temperature of ≥0℃ is represented by southern Henan>western Henan>central Henan>Northern Henan;the precipitation during the filling period is mostly represented by southern Henan>Henan Middle>Western Henan>Northern Henan,the accumulated temperature ≥0℃ during the filling period is usually higher at the intersection of the western Henan production area,the northern Henan production area and the central Henan production area;the total sunshine hours and precipitation in different growth stages of each production area Shows the opposite trend.4)The stepwise regression analysis of yield components and meteorological factors in different wheat producing areas showed that the number of ears in the northern Henan producing areas was positively correlated with the accumulated temperature of sowingoverwintering(0.445**),and the number of grains per ear was positively correlated with the green-flowering precipitation(-0.341**).Was negatively correlated.Thousand-seed weight was positively correlated with the green-flowering sunshine(0.292**)and negatively correlated with the precipitation during the filling period(-0.347**);the number of ears in the central Henan region was positively correlated with the green-flowering sunshine(0.256**)Correlation,the number of grains per spike is negatively correlated with sowing-overwintering sunshine（-0.181*）,overwinteringgreening sunshine（-0.151*）,and greening-flowering accumulated temperature（-0.158*）.Thousand-grain weight is negatively correlated with precipitation during grain filling(-0.324**)、Accumulated temperature during filling period(-0.239**)is negatively correlated;the number of ears in the western Henan production area is positively correlated with accumulated temperature of overwintering-greening(0.471**)and greening-flowering precipitation（0.334*）,grain number per ear is positively correlated with greening-flowering precipitation(0.295**)was positively correlated.Thousand-grain weight was positively correlated with sowingoverwintering accumulated temperature（0.315*）,and negatively correlated with sunshine during filling period（-0.278*）;the number of ears and returning greenflowering accumulated temperature in southern Henan province(-0.497**))Was negatively correlated,the number of grains per spike was positively correlated with the accumulated temperature during the sowing-overwintering period(0.275**),and the thousand-grain weight was negatively correlated with the accumulated temperature during the filling stage(-0.481**). |
PDF Full Text Request