元谋干热河谷景观生态安全时空变化

doi:10.16843/j.sswc.2018.01.017

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Abstract [Background] Dry-hot valley is typical of ecological vulnerable environment. Taking Yuanmou Dry-hot Valley as a case area, systematically and quantitatively evaluating the status, temporal and spatial changes of landscape ecological security, are important for clarifying main influencing factors and their action mechanism of landscape ecological security for providing basic data and theoretical basis.[Methods] Based on remote sensing images of Landsat7-ETM in 2008 and Landsat8-OLI in 2016, we established a landscape ecological security degree (LESD) model to analyze spatial and temporal change characteristics and causes of landscape ecological security by using spatial autocorrelation analysis and geostatistics methods.[Results] 1) The values of landscape ecological security pattern (LESP), landscape ecological quality (LEQ) and LESD ranged from 0.40 to 0.60, belonging to the critical safety level. 2) The values of global spatial auto correlation of LESD rose from 0.600 in 2008 to 0.633 in 2016, showing that global spatial autocorrelation of landscape ecological security increased. The spatial pattern of the local autocorrelation of LESD was consistent with terrain differentiation pattern in the study area. Significant distribution areas of local autocorrelation mainly included high-high value areas and low-low value areas. Different from 2008, high-high value areas of local autocorrelation obtained a continuous spatial distribution in eastern middle-high mountain areas in 2016, while low-low value residential areas in 2016 were obviously split in the low hills around the river dam and the middle-low mountain areas along Jinsha river. 3) The values of the ratio of nugget variance to sill (C₀/C₀+C) of LESD were respectively 28.5% in 2008 and 32.6% in 2016, as well as the values of the change range (A₀) of LESD were respectively 764.82 m in 2008 and 2031.65 m in 2016.[Conclusions] Landscape ecological security of the study area was sensitive. Landscape ecological security of the study area had obvious spatial autocorrelation overall and locally. Structural natural factors dominated by terrain and climate were still determinants of the spatial distribution of regional landscape ecological security, while unstructured factors dominated by human disturbances reinforced their influence on regional landscape ecological security.

Key words： Dry-hot Valley ecological fragility landscape ecological security spatial autocorrelation geostatistics

Received: 25 August 2017

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	OU Zhaorong
	ZHU Qingke
	SUN Yongyu

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OU Zhaorong,ZHU Qingke,SUN Yongyu. Temporal and spatial variation of landscape ecological security in Yuanmou Dry-hot Valley[J]. SSWC, 2018, 16(1): 131-140.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.01.017 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I1/131

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