摘要
基于2000-2020年Landsat影像和数字高程模型等数据,采用面向对象的方法进行绿洲分类,使用趋势分析、重心迁移及地理探测器等方法对西北干旱区绿洲时空特征及其驱动力进行研究。结果表明:2000-2020年,西北干旱区绿洲面积呈线性增加趋势,绿洲面积年均增速为1079.66km^(2)·a^(-1)。绿洲面积增长率由高到低依次为阿拉善、南疆、河西走廊和北疆地区。西北干旱区绿洲主要呈带状或点状分布在天山南北麓、昆仑山、祁连山北麓和阿拉善高原,北疆绿洲面积变化表现为北部增加、南部减少;南疆绿洲主要沿河流扩张,但部分绿洲边缘出现退缩;河西走廊绿洲的扩张与退缩均发生在西北部河流沿岸;阿拉善绿洲呈散点状扩张,无明显退缩区域。北疆和南疆绿洲的重心大体上向东北方向移动,河西走廊绿洲重心沿西北方向迁移,阿拉善绿洲重心呈南北向波动迁移。农田生产潜力对北疆绿洲和河西走廊绿洲空间分异的解释能力最强,分别为43.6%和45.3%;影响阿拉善绿洲分布变化最敏感的因子是降水(解释能力为27.6%);南疆绿洲分布响应最敏感的环境因子是土壤类型(解释能力为44.9%)。西北干旱区绿洲中,人类活动因子之间的交互作用以双因子增强为主,自然因子之间的交互作用为双因子增强和非线性增强。
Based on Landsat images and digital elevation model data during 2000-2020,we investigated the spatio-temporal variations and driving forces of oases in the arid region of Northwest China,using an object-oriented method for oasis classification,and employing trends analysis,centroid migration,and geographic detectors methods.The results showed that from 2000 to 2020,the oasis area in the arid region of Northwest China exhibited a linear increasing trend,with a rate of 1079.66 km^(2)·a^(-1).The growth rate of oasis area,from highest to lowest,was Alxa,Southern Xinjiang,Hexi Corridor and Northern Xinjiang,respectively.Oases in the arid region of Northwest China were mainly distributed in bands or dots along the northern and southern foothills of Tianshan Mountain,Kunlun Mountain,the northern foothills of Qilian Mountain,and the Alxa Plateau.The oasis area in Northern Xinjiang increased while that in the south decreased.Oases in Southern Xinjiang mainly expanded along rivers,with some edges experiencing recession.Expansion and recession of oases in the Hexi Corridor occurred along the rivers in the northwest.Alxa oasis expanded in a scattered pattern with no significant recession areas.The centroids of oases in Northern and Southern Xinjiang generally shifted northeastward,while that in the Hexi Corridor moved northwestward.The centroid of Alxa oasis fluctuated in a north-south direction.The interpretations of agricultural production potential for spatial differentiation of oases in Northern Xinjiang and the Hexi Corridor were the most significant,at 43.6%and 45.3%respectively.Precipitation was the strongest environmental factor affecting Alxa oasis distribution,with an interpretation of 27.6%.Soil types were the strongest factor affecting the distribution of oases in Sou-thern Xinjiang,with an interpretation of 44.9%.The interaction among human activities in oases in the arid region of Northwest China was mainly enhanced by two factors,while the interaction among natural factors was enhanced by both two factors and nonlinear enhancement.
作者
焦岩
闫峰
卢琦
王艳姣
JIAO Yan;YAN Fen;LU Qi;WANG Yanjiao(Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091,China;Institute of Desertification Studies,Chinese Academy of Forestry,Beijing 100091,China;National Climate Center,China Meteorological Administration,Beijing 100081,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2024年第8期2206-2216,共11页
Chinese Journal of Applied Ecology
基金
中央级公益性科研院所基本科研业务费专项(CAFYBB2023ZA009,CAFYBB2018ZA004)资助
关键词
绿洲
时空特征
地理探测器
驱动力
西北干旱区
oasis
spatiotemporal characteristics
geo-detector
driving factor
arid region of Northwest China
