【作者】 姚玉璧； 王润元； 邓振镛； 尹东； 张秀云； 杨金虎； 陈昌平； 安华银；

【Author】 Yao Yubi 1 ,2 ,3 Wang Rongyuan1 Deng ZHenyong1 Yin Dong1 ZHang Xiuyun 3 Yang Jinhu3 Chen CHangping4 An Huayin4 (1. Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province and China Meteorological Administration ,/Lanzhou Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China; 2. Chengdu Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, 610071 China; 3 . Meteorological Bureau of Dingxi of Gansu Province,Dingxi 743000,China; 4 . Meteorological Bureau of Gannan Prefecture of Gansu Province, Hezuo 747000,China)

【机构】 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实验室； 甘肃省定西市气象局； 甘肃省甘南州气象局；

【摘要】 利用甘南高原黄河重要水源补给区气候资料和生态观测资料及统计资料,分析研究区域气候变化特征及其草原湿地生态环境效应,结果表明,甘南高原黄河重要水源补给区降水量年际变化呈下降趋势,降水量的年际变化存在6～7a、15a的年周期振荡特征。甘南高原黄河重要水源补给区年际变化呈上升趋势,增温速度均大于全国增温速度。1980年之后持续偏暖。草地年干燥指数变化呈显著上升趋势,气候变化是草原生态退化的自然诱发因素,而超载过牧,滥采滥挖,人为破坏,生物链失衡等环境蠕变是造成生态退化的人为因素,二者共同作用导致黄河首曲草原湿地水资源锐减、生物多样性减少、生态环境退化。更多还原

【Abstract】 Using main meteorological and eco- environment observational datum in Yellow River important water source supplies area of Gannan Plateau,the Climatic change characteristics and eco- environment effects in Yellow River important water source supplies area of Gannan Plateau were analyzed. The results show that the inter-annual change of precipitation tended to decrease, and their variability is -22.6～-9.6 mm/10a, in 1980s the precipitation taka place deceasing sudden change phenomenon, in addition the precipitation exist 6～7a and 15a main period oscillation in most areas of Yellow River important water source supplies area of Gannan Plateau; Temperature display remarkable increasing trend, the increasing rate higher than that of the whole country, from season change to see, the increasing rate of winter higher than that of the other seasons, in 1970s the temperature takes place sudden change phenomenon, and it shows persistent ascendant trend after 1980 year; Water resource show significant descendant trend, the precipitation of the valley exist remarkable positive correlation with the water resource, and the valley drought index exist remarkable negative correlation with the water resource, the decreasing precipitation and increasing drought index result in water resource to decrease; Theory hold domestic animal capacity of the region savageness grass field is 428.82 ten thousand sheep, but in fact the over loading rate reach 96.39%; climate changes is nature factor of plain zoology degradation, but over loading herd, excessive pick and excessive dig, artificial destroy, biology chain unbalance and so on are artificial factor of plain zoology degradation, water resource sharp decrease, diversity of biology decrease and eco- environment degradation are due to the together effect of above two factors in Yellow River important water source supplies area of Gannan Plateau.更多还原