关键词: 根系, 根系

Abstract: In order to study climate change under the background of generate natural disasters on the prevention and control of desertification horqin sandy land and agricultural production and the effects for sand control and agricultural structure adjustment to provide climate basis, use the most typical area ground minimum temperature material, analyzes the nearly fifty years in the beginning and ending in frost date and no frost period variation characteristics. The results showed that: the global climate change under the background of dim, early frost date change trend appears only slightly delay, delay rate 1.1 days per 10 years. Final frost appear date trend obvious, advance rate 3.4 days per 10 years. No frost period is extended trend and prolong rate 4.5 days per 10 years. Initial frost is still the main meteorological disasters after the drought.