GIS-based Climate Zone Delineation Of The Quality Of Early 39 In Hunan And Jiangxi Provinces

Rice(Oryza sativa)is one of the world's major food crops and has been consumed primarily for direct human consumption.However,as the standard of living increases,the consumption of animal products such as meat,milk and other grains and cereals increases,people's consumption of edible rice is gradually increasing reduction.In recent years,dedicated feed rice has developed rapidly to meet the development of agriculture.The quality requirement of specialized feed rice is different from that of edible rice,while rice quality is closely related to meteorological conditions.Therefore,it is necessary to study the relationship between early 39 quality and meteorological factors in special fodder rice,and to establish the quality of special fodder rice based on GIS technology.Climate zoning is of great theoretical and practical importance.Hunan and Jiangxi provinces are the main two-season rice-producing provinces in China,and the area of early rice production is large.However,early rice grain suffers from low quality and poor taste,so early season rice is mostly used for feed production.In this thesis,the spatial distribution of meteorological elements in the two provinces was studied by using the climatic data and geographic base information of the two provinces in the past years.Sowing experiment to analyze the relationship between early 39 quality and meteorological factors in fodder rice varieties;based on this,we established two provinces based on GIS technology the climatic zoning of dedicated fodder rice quality.The main findings were as follows.The daily average air temperature,daily maximum temperature,daily minimum temperature,daily temperature difference,daily rainfall,daily average solar radiation and other meteorological data from 35 meteorological stations in Hunan Province and 26 meteorological stations in Jiangxi Province over the50-year period from 1966 to 2017,as well as related geographic basic information data,were collected and collated.A high-resolution digital elevation simulation model was constructed using GIS technology and stepwise regression analysis to map the spatial distribution of meteorological elements in the two provinces.The protein content of early 39 husked rice in special fodder rice was significantly correlated with the mean temperature at the whole reproductive period,minimum temperature from sowing to transplanting,maximum and mean temperature from transplanting to maturity,average daily solar radiation,rainfall,minimum and maximum temperature from sowing to maturity,average daily solar radiation and rainfall,respectively,and the percentage of husked rice was negatively correlated with the maximum and minimum temperature at the filling stage(from sowing to maturity),average temperature,mean daily temperature difference and average daily solar radiation.The primary linear equation and the quadratic curve equation were used to mathematically simulate the relationship between the protein content of mid-early 39 and the average temperature at the whole reproductive period,the maximum temperature at the transplanting to the flush stage,the average temperature at the transplanting to the flush stage,the rainfall at the transplanting to the flush stage,the rainfall at the sowing to the flush stage,the protein content of mid-early 39 and the minimum temperature at the flush stage,the average temperature at the flush stage,the daily difference in temperature at the flush stage,and the maximum temperature at the flush stage,respectively.Based on the analysis of staged sowing data and the quadratic curve mathematical simulation equation,the early 39 in special fodder rice was identified,quality climate zoning indicators.The use of the flux path based on simple correlation coefficients of protein content and brown rice ratio with meteorological factors,and the absolute magnitude of the direct flux path coefficient.The weights of each quality climate zoning index factor in the comprehensive quality zoning were calculated by the analysis method.Based on the dedicated fodder rice quality and climate zoning indicators,GIS technology was used to produce the early 39% of the fodder rice in Hunan and Jiangxi provinces,respectively,comprehensive quality climatic zoning map.The results show that the climate zone of early 39 quality in dedicated fodder rice in Hunan and Jiangxi provinces can be divided into sub-quality zone,high-quality zone and high-quality zone.Most of Hunan Province is in the highest quality zone,with some quality zones in western Hunan and scattered sub-quality zones in southern Hunan and throughout the province.The majority of cities and counties in Jiangxi Province are in quality and sub-quality areas,with the highest quality areas mainly located in parts of the provincial border cities and counties,as well as in the province.The city-county border is sporadic.This study provides a reference for the rational layout of early 39 and the adjustment and optimization of agricultural industrial structure in Hunan and Jiangxi provinces for special fodder rice.