河套灌区向日葵终霜冻指标及其时空分布特征

根据河套灌区主要经济作物向日葵历年遭受霜冻影响的调查资料和同期气象资料，确定了向日葵霜冻的气象指标，并采用统计分析方法，对河套灌区各地霜冻的发生规律进行了分析。结果表明，霜冻结束时间，从西南向东北部地区延迟；各地霜冻变化趋势不同,但总趋势是逐渐提前；霜冻变化规律与气温变化规律不同，对作物的影响增大。

The Mccurrence Regulation and its temporal and spatial distribution of Sunflower last frost disaster in Hetao Irrigated Area

According to the river set the inquisition data and same period weather data that infuse main cash crop sunflower of area to suffer the frost influence through the years, make sure the weather index sign of the sunflower frost, and adopt to statistics an analytical method, to the river set the occurrence regulation that infuse the area everyplace frost carried on analysis. Express as a result that the frost be over time, delay toward the northeast region from the southwest; Everyplace frost variety trend different, but total the trend is gradual advance; The frost variety regulation and air temperature change the regulation dissimilarity, to the influence aggrandizement of the farm crop.