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一、前言结古镇,位于青藏高原的东部,东经96°40′,北纬32°57′,海拔3715米,是玉树藏族自治州的首府,属于结古河谷区。该地气候冷温半干旱,年平均气温3℃,最热月平均气温12.6℃,生长期积温1600℃,生长季节190天左右。年降水532.9 mm,蒸腾较强,干燥度为1.1—1.2。年日照2500小时以上,生长季有效太阳辐射188.4—209.3千焦/cm~2。低温冻害频繁,4—5月份日最低气温常在-5—-6℃,7—8月份日最低气温常降至0℃以下。土壤为河谷
I. Introduction Ancient town, located in the eastern part of the Qinghai-Tibet Plateau, longitude 96 ° 40 ’, latitude 32 ° 57’, 3715 meters above sea level, is the capital of Yushu Tibetan Autonomous Prefecture, belonging to the ancient Gugu Valley. The climate cold and semi-arid climate, the annual average temperature of 3 ℃, the hottest month average temperature of 12.6 ℃, growth temperature of 1600 ℃, the growing season of about 190 days. Annual precipitation 532.9 mm, strong transpiration, dryness of 1.1-1.2. More than 2500 hours of sunshine in the growing season, the effective solar radiation 188.4-209.3 kJ / cm ~ 2. Frequent low-temperature freezing damage, the daily minimum temperature in April-May is usually between -5 and -6 ℃, and the lowest temperature in July and August often drops below 0 ℃. The soil is valley