干旱区县域景观格局变化轨迹识别——以宁夏盐池县为例

doi:10.31497/zrzyxb.20190513

摘要/Abstract

摘要：

细致的景观格局时空刻画可以为格局与过程耦合机制分析奠定坚实的数据基础。以半干旱区县域景观格局变化轨迹识别为目标,基于Landsat影像构建了宁夏盐池县1988-2017年景观格局序列,识别景观组分、构型的演化轨迹。研究表明：（1）盐池县研究时段内植被整体增加,显著增加的景观占比为33.53%;裸土整体减少,显著减少的景观占比为35.78%。（2）四项景观构型指数显示,近年来盐池县景观斑块的边缘复杂程度有所加强,除植被的集聚程度不断增加外,其他景观类型的集聚程度相对稳定。（3）盐池县35.08%的像元发生变化,其中变化1次和2次的像元分别占比54.63%和28.60%,首末变化年份间隔为三年的像元占比12.39%。基于连续年份的半干旱区景观变化轨迹判定,可为生态恢复长期监测提供有力的方法支持。

关键词: 景观格局, 土地覆被, 构型指数, 变化轨迹, 盐池县

Abstract:

The detailed spatiotemporal dynamic description of landscape pattern can lay a solid foundation for the data analysis of the coupling mechanism between landscape pattern and ecological process. The current analysis of landscape pattern is in urgent need of developing from the description of static pattern to the quantification of dynamic pattern, so as to link the landscape pattern and ecological process more precisely in detailed time scale. In this study, we regard the change of landscape pattern tracking in the semi-arid region of China as the scientific objective. As the Landsat time series data can capture the detailed information of land use/cover, we constructed the landscape pattern sequence of Yanchi county from 1988 to 2017, defined the rule of landscape pattern change, and explicated the evolution of landscape compositions and configurations based on the Landsat time series remote images in this study. The results show that: (1) Landscape experienced a significant increase of 33.53% in vegetation during the research period, and a significant decrease of 35.78% in bare soil; (2) The four landscape configuration indexes showed that the edge complexity of the landscape patches has been strengthened in recent years, and the agglomeration degree of other landscape types is relatively stable except for the increasing agglomeration degree of vegetation; (3) 35.08% of he pixel changed, among which the pixel changes once or twice accounted for 54.63% and 28.60%, respectively, and the pixel with a three-year interval between the first and last changes accounted for 12.39%. The determination of landscape change trajectories in the semi-arid region over continuous years can improve a powerful support for the long-term monitoring of ecological restoration.

Key words: landscape pattern, land cover, configuration index, change trajectory, Yanchi county

程琳琳, 刘华, 刘焱序. 干旱区县域景观格局变化轨迹识别——以宁夏盐池县为例[J]. 自然资源学报, 2019, 34(5): 1066-1078.

Lin-lin CHENG, Hua LIU, Yan-xu LIU. Track the county level landscape pattern change in semiarid region: A case study in Yanchi county, Ningxia, Northwest China[J]. JOURNAL OF NATURAL RESOURCES, 2019, 34(5): 1066-1078.

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日期	卫星	日期	卫星	日期	卫星
1988-05-01	Landsat 5	2000-08-22	Landsat 5	2010-07-17	Landsat 5
1989-08-24	Landsat 5	2001-08-09	Landsat 5	2011-06-18	Landsat 5
1990-06-08	Landsat 5	2002-06-24	Landsat 5	2013-06-07	Landsat 8
1991-08-30	Landsat 5	2003-08-15	Landsat 5	2014-07-28	Landsat 8
1992-08-16	Landsat 5	2005-06-01	Landsat 5	2015-09-01	Landsat 8
1993-06-16	Landsat 5	2006-08-07	Landsat 5	2016-05-30	Landsat 8
1995-06-22	Landsat 5	2007-06-23	Landsat 5	2017-09-06	Landsat 8
1997-10-01	Landsat 5	2008-06-25	Landsat 5
1999-06-17	Landsat 5	2009-06-28	Landsat 5