1961～2010年甘肃合作地区草地潜在蒸散量及地表湿润度变化特征  

The variety characters of potential evapotranspiration and soil surface humidity index in Hezuo,Gansu During 1961-2010

作　　者：王建兵[1,2] 汪治桂 王素萍[1] 

机构地区：[1]中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室,兰州730020 [2]甘南州气象局,合作747000

出　　处：《干旱区资源与环境》2013年第11期159-164,共6页Journal of Arid Land Resources and Environment

基　　金：中国科学院寒旱区陆面过程与气候变化重点实验室开放基金"黄河源区气候变化的分析研究"资助

摘　　要：为了对青藏高原东北部边坡地带潜在蒸散量和地表湿润度的变化进行研究,利用甘肃省合作市气象站1961～2010年的地面气象观测资料,根据Penman-Monteith模型计算了合作地区草地潜在蒸散量,发现合作地区年潜在蒸散量呈明显上升的趋势,上升趋势为13.0mm/10a;地表湿润度以-0.02/10a的趋势减小,出现了明显的暖干化趋势。温度升高和相对湿度下降是造成合作地区草地潜在蒸散量上升的主要气候影响因子,同时日照时数增加、降水量减少和风速增大对合作地区草地潜在蒸散量上升也有重要影响。To study the variety of the potential evapotranspiration and the soil surface humidity index of the border area in the North-East Qinghai-Xizang plateau,the Hezuo was selected as an example site.Based on the meteorological data（1961～2010） of the Hezuo weather observation station,the potential evapotranspiration was computed by using Penman-Monteith model,and the changes of potential evapotranspiration and soil surface humidity index of Hezuo meadow was analyzed.The results indicated that the potential evapotranspiration in Hezuo showed an obvious increasing tendency with the tendency ratio of 13.0mm/10a;the climate tendency of soil surface humidity index was-0.02/10a,the warm-drying tendency was obviously.The most important climatic factors to the potential evapotranspiration increasing were the temperature and air humidity,next were the sunshine duration,precipitation and the wind speed.

关 键 词：地表湿润度 潜在蒸散量 Penman-Monteith模型 暖干化 合作地区 

分 类 号：P332.2[天文地球—水文科学]