CAJ | 학술논문

依据西藏当雄县1991-2012年5-9月的气象资料，应用FAO56 Penman - Montieth 公式计算了ET0，并对其年际、月际变化特征及影响因素进行了分析。结果表明：①西藏当雄县1991-2012年作物生育期内ET0、最高气温、平均气温的年际变化均呈波动上升趋势，平均相对湿度呈逐年降低趋势，最高气温、平均相对湿度、平均气温、平均降雨量对ET0的年际波动有明显影响，影响的先后顺序为平均相对湿度＞最高气温＞平均气温＞降雨量；②1991-2012年ET0的月平均值呈5-6月上升、7-9月下降的趋势，其中6月最大，9月最小；③作物生育期内不同月份ET0的主要影响因素不同，5、8、9月的最大影响因素为日照时数，6、7月分别为气温、降雨；④ET0的年变化主要受5-6月ET0波动的影响，7、9月次之，8月影响较小，反映出近年来藏中地区5-6月的气候变化要比其他月份的显著。
의거서장당웅현1991-2012년5-9월적기상자료，응용FAO56 Penman - Montieth 공식계산료ET0，병대기년제、월제변화특정급영향인소진행료분석。결과표명：①서장당웅현1991-2012년작물생육기내ET0、최고기온、평균기온적년제변화균정파동상승추세，평균상대습도정축년강저추세，최고기온、평균상대습도、평균기온、평균강우량대ET0적년제파동유명현영향，영향적선후순서위평균상대습도＞최고기온＞평균기온＞강우량；②1991-2012년ET0적월평균치정5-6월상승、7-9월하강적추세，기중6월최대，9월최소；③작물생육기내불동월빈ET0적주요영향인소불동，5、8、9월적최대영향인소위일조시수，6、7월분별위기온、강우；④ET0적년변화주요수5-6월ET0파동적영향，7、9월차지，8월영향교소，반영출근년래장중지구5-6월적기후변화요비기타월빈적현저。
According to the meteorological data between May and September from the year 1991 to 2012 in Dangxiong County,the reference evapo-transpiration was calculated by FAO56 Penman-Montieth formula. Variation and influences of annual evapotranspiration and monthly evapotranspi-ration also had been researched. The results show that:a)in Dangxiong County of Tibet,ET0 ,the highest temperature,average temperature are in rising interannual variability,while the average relative humidity is decreased year by year from 1991 to 2012 in the period of crop growth. The in-terannual fluctuation of ET0 has obviously been affected by the highest temperatures,average temperature,average relative humidity and average rainfall,and the order of influence is average relative humidity>the highest temperatures>average temperature>rainfall;b)from 1991 to 2012, monthly average of ET0 is rising in May and June and decreasing from July to September. The maximum and the minimum value appear in June and September respectively;c)the main influence factors to ET0 are different. The hours of sunshine is the main influence factors in May,August and September. The temperature and rainfall are key factor respectively in June and July;d)the interannual variability of ET0 is mainly affected by ET0 ’s fluctuation in May and June,followed in July and September,and August is smaller,hence,the climate change in May and June is more significant than the other months in the area of middle Tibet in recent years.