西北地区的生态环境灾害中国科学院及水利部西北水土保持研究所彭珂珊　我国西北地区指陕、甘、青、宁、新５省区，总面积３０３万平方公里，占全国国土面积的３１．６％；耕地面积０．１１亿公顷，占全国耕地面积的１２％；人口７９４２万人，其中农业人口５８７５万人，... Ecological Environment Disasters in the Northwest China Academy of Sciences and the Northwest Institute of Water and Soil Conservation, Ministry of Water Resources PORSON China’s northwestern region refers to Shaanxi, Gansu, Qinghai, Ningxia and the new 5 provinces and autonomous regions, with a total area of ​​3.03 million square kilometers, accounting for 31.6% of China’s total land area. ; Arable land area of ​​011 million hectares, accounting for 12% of the country’s arable land; population of 79.42 million, of which agricultural population 5875 people, ...