典型土地利用类型旱涝急转事件发生时段气温变化特征

基于安徽省土地利用数据遴选出灌木、草地和湿地3种典型的天然生态系统,结合灌木和湿地(1960～2013年)、草地(1967～2013年)3个相应气象站点逐日降雨和气温资料,采用连续无雨日和降雨等级标准,筛选出近50年天然生态系统中夏季(6～8月)发生的旱涝急转事件,分析3种土地利用类型在发生旱涝急转时段内气温的变化特征。结果表明,旱涝急转发生时段的平均气温均高于同时段多年平均气温;旱涝急转发生时段气温表现出先升高,后在降雨日前或降雨日开始逐渐降低,并在降雨日当天气温降幅较大;灌木、草地和湿地3种天然生态系统旱涝急转发生时段气温的变化特征基本一致。

Temperature Variation Characteristics of Typical Land Use Types during Drought and Flood Abrupt Alternation

Based on the daily precipitation and temperature data of bush and wetland (from 1960 to 2013) and grassland(from 1967 to 2013) in Anhui Province and combined with continuous rainless days and rainfall grade standards, the drought and flood abrupt alternation events of natural ecosystems in the summer (from June to August) in recent 50 years were screened out. Meanwhile, the characteristics of temperature changes were analyzed during the drought and flood abrupt alternation. The results show that during drought and flood abrupt alternation, the temperature was higher than the average multi-annual temperature in the same period; During the drought and flood abrupt alternation, the temperature increased first, then gradually decreased before or on the rainy day. The temperature usually dropped a lot on the rainy day; The changes of temperature of the three natural ecosystems (bush, grassland and wetland) were basically the same during the drought and flood abrupt alternation.