Unexpected impacts of climate change on alpine vegetation
Unexpected impacts of climate change on alpine vegetation
复制标题
干旱区耕地面积变化影响因素——以西北石羊河流域为例
DOI：
10.1890/1540-9295(2007)5
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发表时间：
2007-09-01
影响因子：
10.3
通讯作者：
Guglielmin, Mauro
中科院分区：
文献类型：
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作者：
Cannone, Nicolem;Sgorbati, Sergio;Guglielmin, Mauro
农田的扩张被认为是人类对地球仪周围环境最重要的改变之一。利用实地调查和社会经济数据，结合1986年和2000年的专题影像，分析了位于石羊河流域中下游的凉州绿洲和民勤绿洲农田面积变化及其影响因素。1986 - 2000年，两绿洲耕地面积均有所增加，但民勤绿洲增加幅度较大。在这两个地区，人口增长与农田面积扩大呈正相关，农业技术的改进和经济发展也是如此。凉州绿洲耕地面积的增加与地表水的存在量密切相关，而民勤绿洲耕地面积的增加受环境和气候条件的影响。这些结果表明，凉州绿洲的经济发展可能导致下游民勤绿洲的环境退化。
Expansion of farmland is recognized as one of the most important human alterations to the environment around the globe. Using field investigations and socioeconomic data in combination with thematic mapper images taken in 1986 and 2000, we analyze farmland area changes and factors correlated with those changes in Liangzhou and Minqin oases, located near the middle and lower reaches of the Shiyang River basin in Gansu province, northwestern China. Between 1986 and 2000, farmland area increased in both oases, but the increase was greater at Minqin oasis. Population growth was positively correlated with farmland area expansion in both locations, as were improved agricultural techniques and economic development. In Liangzhou oasis, farmland expansion was closely linked to the amount of surface water present, while in Minqin oasis, farmed area growth was affected by environmental and weather conditions. These results suggest that economic development at Liangzhou oasis may be leading to environmental degradation downstream, at Minqin oasis.