关键词: 黄前流域, 黄前流域, 土壤侵蚀, 影响因子

Abstract:

In order to research the early frost disaster risk of corn in Heilongjiang Province for guiding the rational crop breed layout and reducing hazard of early frost disasters, the author took the corn as an example, from the identification of early frost disaster critical weather conditions, calculation of corn frost disaster critical meteorological conditions in the mature safety before the occurrence of the probability as a risk index risk division, drawing risk zoning map based on the theory of GIS. The results showed that corn frost risk distribution area had two distinct characteristics: one was the zonal distribution from north to south risk decreased along with latitude; the second was the risk increasing with the height increased. Daxing’anling, Heihe became the highest risk areas under the dual influence of high latitude and high elevation. Songnen plain and Sanjiang plain were the low risk areas because of the low altitude and relatively low latitude. Based on the climate warming and risk zoning map analysis, climate warming made corn planting area expand, and made a certain extent reduce of corn early frost disaster risk.