干旱区研究

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2020 , Vol. 37 >Issue 4: 1048 - 1056

DOI: https://doi.org/10.13866/j.azr.2020.04.26

黑河流域绿洲变化的模式与稳定性分析

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  • （1. 兰州大学资源环境学院，甘肃 兰州 730000；2. 兰州大学西部环境教育部重点实验室，甘肃 兰州 730000； 3. 西华师范大学国土资源学院，四川 南充 637002）
董敬儒（1994－），女，硕士研究生，研究方向为干旱区遥感应用研究. E-mail：dongjr17@lzu.edu.cn

收稿日期: 2019-10-16

  修回日期: 2020-03-17

  网络出版日期: 2020-10-18

基金资助

国家自然科学基金项目（41471163，41530752）；兰州大学祁连山研究院开放课题［504000（- 87080306）］资助

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Analysis of patterns in the variation and stability of oases in the Heihe River basin

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  • （1. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, Gansu, China; 2. Key Laboratory of Western China’s Environmental System（Ministry of Education）, Lanzhou University, Lanzhou 730000, Gansu, China; 3. College of Land and Resources, China West Normal University, Nanchong 637002, Sichuan,China）

Received date: 2019-10-16

  Revised date: 2020-03-17

  Online published: 2020-10-18

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摘要

本文旨在探索黑河流域绿洲近55 a的时空变化模式与稳定性。基于1963—2017年的16期多源遥感影 像，提取了55 a黑河流域绿洲空间分布信息，使用叠置分析、格网化等方法，分析黑河流域绿洲变化模式与稳定性 的时空特征。结果表明：黑河流域绿洲以波动变化模式为主，波动绿洲主要分布在灌溉保证程度差和土壤盐渍化 的地区；扩张绿洲呈现早期向内填充、中后期向外扩张的模式；退缩绿洲主要分布在生态脆弱的绿洲边缘。黑河流 域绿洲总体上逐渐趋向稳定，下游绿洲稳定性低于中游；中游及下游的金塔、鼎新绿洲波动主要发生在早期，而下 游额济纳绿洲的波动主要发生在中期。

关键词： 绿洲; 变化模式; 稳定性; 遥感; GIS; 黑河流域

本文引用格式

董敬儒, 颉耀文, 段含明, 王晓云, 李汝嫣 . 黑河流域绿洲变化的模式与稳定性分析[J]. 干旱区研究, 2020 , 37(4) : 1048 -1056 . DOI: 10.13866/j.azr.2020.04.26

Abstract

This article aims to explore spatiotemporal patterns in the variation and stability of oases in the Heihe River basin in the last 55 years. This study involved multi-source remote sensing images in 16 periods from 1963 to 2017. Information on the distribution of oases in the Heihe River basin was extracted from the images. Then, the temporal and spatial characteristics of the variation and stability of oases in the basin were analyzed using overlay analysis and a grid-transformed model. According to the transformation from oasis to desert and changes in oasis boundaries, the oases were divided into four categories: stable, expanding, shrinking, and fluctuating. In order to make up for the shortcomings of previous research methods such as single dynamic degree, we established a grid-transformed model of spatial dynamic degree and cumulative dynamic degree considering total change to analyze the spatial distribution of the stability of oases. The results show the following: In the past 55 years, the oases in the Heihe River Basin were predominantly fluctuating. Oasis fluctuations mainly occurred in areas with poor water source reliability and saline-alkaline soil. Expansions of the oasis mainly occurred in the gap between the existing oasis patches in the early years, and occurred on the outer edge of the existing oasis in the middle and later years. Shrinkages of the oasis mainly occurred in the ecologically fragile zone on the edge of the oasis. The expansions of oases in the early years were mainly due to population growth and immigration policies, while the expansion of oases after the year 2000 was mainly caused by the innovation of agricultural production technologies such as drip irrigation and sprinkling irrigation. Oases in the Heihe River basin gradually became stable. The stability of oasis in the lower reaches of the Heihe River was lower than that of oases in the middle of the river. Fluctuations in oases in the middle and lower reaches in Jinta County and Dingxin County mainly occurred in the early stage, while oases in Ejina County fluctuated in the middle stage. Land salinization and broad-shallow and shifting channels of the Heihe River are the important factors influencing oasis stability. This paper constructed a time series of oasis dynamics on the basis of a grid-transformed method. It simultaneously detects the temporal and spatial characteristics of changes in oases and reduces the analysis unit to the grid scale so that changes in oases can be identified and analyzed more effectively.

Key words： oasis; change pattern; stability; remote sensing; GIS; Heihe River Basin

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