干旱区生态环境知识资源中心(Arid): 1963-2012年黑河下游额济纳绿洲的时空变化

Arid

	1963-2012年黑河下游额济纳绿洲的时空变化
其他题名	Spatial-temporal changes of oases in Ejin Banner of the Heihe River Basin from 1963 to 2012
	颉耀文 1; 姜海兰 2; 王学强 2; 马宗义 2; 陈云海 2
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2014
卷号	37 期号:4 页码:786-792
中文摘要	以1963-2012年的14期多源遥感影像为数据源,提取了黑河下游额济纳地区典型样本年的绿洲空间分布情况,并将其分解为增和减两种过程分别进行了分析;利用格网化手段和GIS叠置分析功能,基于绝对累积变化率、相对累积变化率和绝对相对累积变化率的联合使用,对绿洲的时空变化类型进行了划分;利用绝对累积变化率分析了绿洲变化的剧烈程度。研究表明:50 a间除少数几个时期外,额济纳绿洲总体呈扩张趋势,2012年相对于1963年增加了87.05%;额济纳旗绿洲的时空变化可以划分为增加、减少、波动和稳定四种类型,其中波动变化区占87.2%,是主导性变化类型;绿洲变化剧烈程度的空间差异很大,总体而言,三角洲核心区域的剧烈程度最低,三角洲边缘地区剧烈程度较高,其中尤以东部边缘的农垦区最为明显;额济纳旗绿洲50 a间的变化明显地表现出下游型绿洲深受上中游来水量影响而不稳定的特点。
英文摘要	The Heihe River Basin is the second largest inland river basin in northwest China,but at the same time, it is greatly vulnerable for its arid ecological environment. The Ejin Oasis, locating in the lower reaches of the Heihe River, Inner Mongolia, China, is a vital ecological defense of forefront of the Heihe River Basin. Considering that the Ejin Oasis was undergone great changes in recent 50 years due to the influence of human activity and climate change, this paper aims at calculating the net changes of oasis area in the adjacent sample years and dividing the changing patterns of Ejin Oasis. Taking 14 image data in recent 50 years as the data source, including KeyHole, KATE-200 and Landsat MSS/TM,the spatial distribution of the oasis in Ejin Banner was firstly extracted using object-oriented image segmentation and automatic threshold method combined with visual interpretation. Then the method to calculate net changes of oasis area was proposed,the method to divide changing patterns was found out by proposing NACK_(grid), NRCK_(grid) and NARCK_(grid) under the guidance of grid-based method and the support of GIS overlay analysis function. It turned out that the method proposed in this paper was effective and it would make it easier for us to understand the direction of the change of oasis ; the changing patterns of oasis in the latest 50 years could be divided into expanding, shrinking, stable and fluctuanting by the combined utilization of NACK_(grid), NRCK_(grid) and NARCK_(grid); what ’ s more, the intensity of oasis change could be expressed by NACK_(grid). As a result, the spatio-tem-poral changes are analyzed of the Ejin Oasis from 3 aspects : the scale of oasis, changing patterns and the intensity of oasis change, and the following conclusions were reached : (1) It turned out that the changes of the Ejin Oasis showed an expansion trend in the latest 50 years,except for a few intermittent periods of shrinkage. Furthermore, the total area was increased by 87.05% from 1963 to 2012; (2) The fluctuating was the dominant spatio-temporal changing pattern with the proportion of 87.2% of the total area, and the expanding, stable and shrinking occupied 6.4%, 4.3% and 2.1%, respectively ; (3) The spatial difference of the intensity of oasis change is evident. The intensity of core area of the delta is the lowest compared with the whole region ; however,the intensity of the fringe areas of the delta is relatively high,especially in the reclamation region in eastern edge of the delta. Finally,the conclusion could be shown that the Ejin Oasis was unstable, fragile and mutable in the latest 50 years, and it is a typical representation of terminal oasis in the inland river basin which shows high dependence on water resources,in stark contrast to midstream oasis which is dominated by irrigated agriculture.
中文关键词	时空变化 ; 格网化 ; 叠置分析 ; 额济纳绿洲
英文关键词	spatial-temporal changes grid transformation overlay analysis the Ejin Oasis
语种	中文
国家	中国
收录类别	CSCD
WOS类目	REMOTE SENSING
WOS研究方向	Remote Sensing
CSCD记录号	CSCD:5205382
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231127
作者单位	1.兰州大学资源环境学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国; 2.兰州大学资源环境学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	颉耀文,姜海兰,王学强,等. 1963-2012年黑河下游额济纳绿洲的时空变化[J]. 兰州大学,2014,37(4):786-792.
APA	颉耀文,姜海兰,王学强,马宗义,&陈云海.(2014).1963-2012年黑河下游额济纳绿洲的时空变化.干旱区地理,37(4),786-792.
MLA	颉耀文,et al."1963-2012年黑河下游额济纳绿洲的时空变化".干旱区地理 37.4(2014):786-792.