Study On Optimization Of Rice Cropping System In The Middle And Lower Reaches Of The Yangtze River Based On Simulated Yield

The middle and lower reaches of the Yangtze river area as the main rice producing areas of our country,The area in the transition zone of single and double rice cropping,It is typical of single and double rice mixed cropping area, with a maturity of more species planted in each region;Based on simulation yield seeking the optimal planting system to ensure high and stable yield of rice which is very important for China’s rice and food security and also is an important subject of agricultural meteorological research.. Facing the reality of global warming has not changed,in order to better cope with climate change on the influence of the rice planting system in the middle and lower reaches of the Yangtze river area; According to the middle and lower reaches of the Yangtze river region nearly 60 years of climate data,construct rice yield model,GIS technology is used to study the temporal and spatial distribution of the middle and lower reaches of the Yangtze River in different regions of rice optimal cropping system to find the best cooked rice collocation,adjust the rice cropping system advantages of the middle and lower reaches of the Yangtze River. To provide an important theoretical basis for the sustainable development of rice production in the future.The main research contents and conclusion are as follows:1. This paper presents the research of rice suitability of climatic conditions on the basis of considering whether Rice can achieve the highest level of production; and the comprehensive evaluation of different rice production areas in the middle and lower reaches of the Yangtze River way of optimal cooked collocation method.2. Combined with the features of common rice varieties in the middle and lower reaches of the Yangtze River. The empirical determination of different maturity varieties of rice growing period of days. The concept of possibility planting system division was put forward,and the number of days of the rice safe growing season was chosen as the climatic zoning index of different planting layout to divide the middle and lower reaches of the Yangtze River.3. The Logistic curve fitting different ripe varieties of rice leaf area index,and using the method of Gaussian stratification to simulate the entire rice canopy photosynthetic effective radiation Considering the effects of Cold Dew wind on double cropping rice production. Establish a rice production model based on the environmental factors such as light and temperature. Adopt the method of step by step correction on the rice yield quantitative simulation.4. Calculate the middle and lower reaches of the Yangtze river area under different cooked ripe collocation and select the highest average rice simulated yield in the period of 1955-1974,1975-1994,1995-2014. extracting the highest average yield of maturity with the way as most of the rice region excellent cropping systems,and draws nearly six decades of dynamic optimal distribution of the middle and lower reaches of the Yangtze River area cropping systems with ArcMap.5. Depending on the distribution map of the Yangtze River region cropping systems giving a analysis of the optimal cropping system of dynamic distribution in the middle and lower reaches of the Yangtze River area,the optimal cropping system change obviously,about to north latitude 0.6~0.8 degree.Reasonable analysis and adjust the cropping systems,to ensure that the high and stable yield of local rice.