自然与人文交互作用下的干旱区典型绿洲耕地动态变化驱动力分析——以新疆于田绿洲为例

 绿洲是干旱区独特的自然景观,是人们生产生活的载体。如何在保持经济发展、提高人民生活水平的基础上保护有限的耕地资源,是关系到干旱区绿洲和谐以及可持续发展的重要问题。选取干旱区典型绿洲——于田县1949_2004年的自然与人文统计资料,首先分析了五十余年来该县耕地变化的情况。然后从自然与人文两个角度对影响耕地面积变化的因子进行分析,结果表明,自然因素往往构成一定区域绿洲发展的基本限制,人为因素在短时期内,对耕地的变化起着决定性作用,这种作用如果顺应自然因素的限制,则对绿洲发展有利,绿洲稳定性增强;反之,绿洲稳定性减弱,由于新疆绿洲外围多为戈壁及沙漠,因此,对绿洲的利用要遵循自然规律,以保护绿洲为前提,合理利用水等自然资源,否则绿洲的面积随时都有可能缩小。

Studies on Driving Forces to Dynamic Changes of Arable Land in Arid Area Resulted from Interaction of Natural and Human Factors: A case in Yutian oasis of Xinjiang Province

Driving forces to the changes of arable land is one of important issues for LUCC (land use/cover change) research nowadays. The driving forces can be classified into two kinds: natural or human factors. Yutian country is located in the south of the Tarim Basin, and belongs to the extreme arid desert climate. Most social-economic activities occurred in the oasis region, but the oasis area is unceasingly reducing. In order to keep a sustainable development of economy, the protection of the arable land is very important in this region. The authors firstly have a look back to the dynamic change of arable land from 1949 to 2004 in Yutian Oasis, then analyze the driving forces to the change of arable land from two natural and human aspects. The results indicate that the natural factor is a basic restriction in the long-term development of oasis, and social-economical factor is a main factor in the short-term development. If the human activities are conformable to the natural the oasis area will enlarge, otherwise the oasis area will reduce.