摘要
基于云南大围山地区1960-2014年气温和降水观测资料,应用高桥浩一郎陆面蒸发经验公式计算了可利用降水量,并以降水量计算SPI (标准化降水指数)指数;采用线性趋势分析和小波分析等方法分析了该地区55a来可利用降水量和干旱的年际、季节变化和空间分布特征.结果表明:(1)年可利用降水量呈减少趋势,春季和冬季呈增加趋势,夏季和秋季呈减少趋势,且年和秋季可利用降水量在偏冷(偏暖)时段,较多年平均值偏多(偏少);年和秋季干旱强度呈增强趋势,春、夏、冬季呈减弱趋势.(2)年和四季可利用降水量分别存在18a、16a、27a、18a和11a主周期变化;年和四季干旱强度分布存在5a、4a、6a、6a和20a主周期变化.(3)年和四季可利用降水量均呈南多北少的空间分布特点;年、夏季和冬季干旱强度均呈北部强、南部弱,而春季和秋季呈中部强的空间分布特点.(4)未来年和春季可利用降水量可能呈增加趋势,夏季、秋季和冬季可利用降水量可能呈减少趋势;年和春季干旱强度可能呈减弱趋势,而夏季、秋季和冬季可能呈增强趋势.
Based on the observed data of temperature and precipitation in Dawei Mountain area of Yunnan Province from 1960 to 2014,the available precipitation was calculated by using land surface e vaporation of Takahashi＇s evaporation equation formula.The interannual and seasonal variations of a vailable precipitation and drought were analyzed by means of linear trend analysis and wavelet analysis over the past 55 years.The results indicated that the annual, summer and autumn utilizable precipitati on showed an decreasing trend,spring and winter showed an increasing trend.The drought intensity in creased in annual,autumn but decreased in spring,summer and winter.The annual and seasonal utiliza ble precipitation has 18 a,16 a,27 a,18 a and 11 a main period, respectively. Annual and seasonal drought intensity have 5 a,4 a,6 a,6 a,20 a main period,respectively.The spatial distribution charac teristics of utilizable precipitation in the south is abundant and in the north is less.Annual, summer and winter drought intensity is strong in northern and weak in southern, whereas spring and autumn is strong in central.The utilizable precipitation may show an increasing trend for annual and spring, and show an decreasing trend in summer,autumn and winter in the future.Drought intensity may show an decreasing trend in annual and spring,but show an increasing trend in summer,autumn and winter.
作者
王平
程清平
张开平
WANG Ping;OHENG Qing-ping;ZHANG Kai-ping(School of Tourism and Geographical Sciences,Yunnan Normal University,Kunming 650092,China;The Forestry Administration of Yunnan Honghe Hani and Yi Autonomous Prefecture,Mengzi 661100,China)
出处
《云南师范大学学报（自然科学版）》
2018年第6期64-70,共7页
Journal of Yunnan Normal University:Natural Sciences Edition
基金
云南大围山国家级自然保护区综合科学考察计划资助项目
关键词
大围山地区
可利用降水量
干旱强度
变化趋势
周期变化
Dawei Mountain Area
Utilizable precipitation
Drought intensity
Change trend
Periodic variation
