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通过对纵向岭谷区的保山、景洪、元江及比邻区的昆明等4个典型站的逐日参照作物腾发量分析,发现在低纬度和高原气候的共同作用下,形成逐日ET0变化的“延迟现象”,即在5月份达到年内极大值ET0,max后缓慢下降,在极大值的80％-85％水平上波动并维持到秋季,此后的变化趋势才与内地一致．气象因素导致了研究区普遍种植的中稻作物需水量及灌溉需水的高峰期与水稻生理生长的高峰期错位,实际高峰期出现在雨季到来之前,生育期的需水强度为6．1-8．2 mm／d,变幅较内地小．在“通道-阻隔”作用下,纵向岭谷区水稻灌溉需水量与纬度、经度及海拔都呈现一定的相关性,东经100°的海拔1550m区域内水稻灌溉需水与纬度的相关系数为0．857,水稻灌溉定额为6240-8550m3／hm2;受东南季风和西南季风气候的影响,北纬23．5°的红河大断裂东西两侧地带的水稻灌溉需水量与经度的相关系数分别达到0．878和0．913,水稻灌溉定额分别为7260-7440和5970-7740 m3／hm2;而东经100°条状区海拔高程与水稻灌溉需水量的相关系数为0．636,水稻灌溉定额为6240-8550 m3／hm2．
By analyzing the daily reference evapotranspiration of four typical stations including Baoshan, Jinghong and Yuanjiang in the Longitudinal Range-Gorge Region and Kunming, the adjacent region, it is found that under the combined effect of low latitude and plateau climate, a daily “ Delay phenomenon ”, that is, it reached an annual maximum value of ET0, max in May and then slowly dropped. It fluctuated between the level of 80% and 85% of the maximum value and maintained the fall until the year before the change trend was consistent with that of the Mainland. The meteorological factors led to the widespread planting of middle-season rice crops in the study area, the peak water demand of irrigation and the peak dislocation of physiological growth of rice, the actual peak appeared before the arrival of the rainy season, and the water requirement of the growth period was 6.1-8 .2 mm / d, smaller amplitude than the Mainland. Under the “channel-barrier” effect, the irrigation water requirement of rice in the longitudinal ravine valley showed some correlation with latitude, longitude and altitude. The correlation coefficient of irrigation water requirement with latitude was 0 when the longitude 100 ° E was 1550m above sea level. 857 and the rice irrigation quota is 6240-8550m3 / hm2. The correlation coefficient between irrigation water requirement and longitude of rice on both east and west sides of the Honghe Grand Fault at latitude 23.5 ° is 0.878 and 0.818, respectively, due to the influence of the southeast monsoon and southwest monsoon climate. 0.913, and the irrigation quotas of rice were 7260-7440 and 5970-7740 m3 / hm2, respectively; while the correlation coefficient of the elevation of 100 ° strip with rice irrigation water requirement was 0.636 and the irrigation quota of rice was 6240-8550 m3 / Hm2.