| In order to discuss the spatial and temporal distribution regulation of climate risk in the cotton production in Hebei Province, have analyzed the air temperature, precipitation, sunshine hours in each cotton growth stage, climate risk degree and its spatial and temporal changing trend by using the meteorologic data and cotton yield in 21 cotton planting counties of Hebei Province from1970 to 2011. The results showed that: The biggest climate element risk degree was the precipitation, which was from 0.138 to 0.267, the secondly was the temperature with 0.007 to 0.173, the lowest was sunshine hours, which was 0.019 to 0.04. The climate element risk degree was different in each growt
h stage, also the spatial and temporal changing tendency had obvious difference. The spatial distribution of risk degree has obvious regional characteristics, such as the risk degree in south cotton region was higher than the mid-northern region. From the historical change trend, the precipitation risk degree was increased in seedling stage and flowering and boll-forming stag, but decreased in other growth stages, among them the decrease was more obviously in the flower and boll stage and opening stages. The air temperature risk degree was slightly increased in the flower and boll stage, but in other stages was slightly decreased. The risk degree of sunshine hours excepted the planting stage, total had the increasing trend. This research results have the important significance for the cotton production layout and scientific decision-making in Hebei Province. |