SPATIOTEMPORAL VARIATION OF VEGETATION COVERAGE ON LANDSCAPE SCALE IN HILLY LOESS REGION: A Case Study of Jincheng City in Shanxi Province
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摘要:
植被覆盖是评价区域生态环境状态的主要影响因子. 基于景观生态学的分析方法, 以2006—2015年的MOD13Q1遥感数据为基础, 获取植被覆盖指数, 对山西省晋城市植被覆盖时空变化进行研究. 结果表明: 研究区植被覆盖呈现增加趋势, 主要增加的类型为高植被覆盖. 植被覆盖指数分布与高程和坡度正相关, 即高程越高、坡度越大的地区植被覆盖指数越高. 在景观尺度上, 植被覆盖的类型呈现出一种集中趋势, 即景观内部异质性和多样性降低, 高植被覆盖斑块对景观的支配程度加强且逐渐处于优势地位. 在斑块类型尺度上, 以高植被覆盖为主, 且斑块所占比例呈增加趋势. 此外高植被覆盖景观破碎程度减小, 复杂度降低, 形状逐渐规则.
Abstract:Vegetation coverage is the main factor affecting the evaluation of regional eco-environment. Through the landscape ecological analysis method, the vegetation coverage index (VCI) is acquired to study the spatiotemporal variation of vegetation coverage in Jincheng City of Shanxi Province based on the MOD13Q1 remote sensing data during 2006-2015. The results indicate that the vegetation coverage show an increasing trend, dominated by high coverage vegetation. The distribution of VCI is positively correlated with elevation and slope, i.e., the higher elevation and the steeper slope, the greater VCI. The vegetation coverage types show a concentrated tendency at landscape scale, while the internal heterogeneity and diversity of landscape are reduced, the high vegetation coverage patch becomes more dominant and gradually superior. At patch scale, high coverage vegetation is dominant, with increasing proportion of patch. Furthermore, the high coverage vegetation is characterized by reduced landscape fragmentation and complexity, and gradually regular shape.
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Key words:
- remote sensing /
- MOD13Q1 data /
- vegetation coverage /
- landscape pattern /
- hilly loess region /
- Shanxi Province
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表 1 2006—2015年晋城市不同高程植被覆盖指数变化
Table 1. Changes of vegetation coverage index by elevations in Jincheng City during 2006-2015
高程/m 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 平均值 < 600 0.76 0.75 0.76 0.73 0.77 0.78 0.82 0.77 0.78 0.82 0.77 600~1000 0.76 0.75 0.76 0.71 0.76 0.78 0.82 0.76 0.78 0.81 0.77 1000~1400 0.89 0.89 0.90 0.88 0.90 0.91 0.94 0.90 0.93 0.94 0.91 1400~1800 0.98 0.98 0.99 0.98 1.00 1.00 1.00 0.99 1.00 1.00 0.99 >1800 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 
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表 2 2006—2015年晋城市不同坡度植被覆盖指数变化
Table 2. Changes of vegetation coverage index by slope gradients in Jincheng City during 2006-2015
坡度/° 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 平均值 0~2 0.71 0.70 0.70 0.64 0.69 0.72 0.76 0.69 0.72 0.75 0.71 2~6 0.73 0.71 0.72 0.66 0.71 0.74 0.78 0.71 0.73 0.77 0.73 6~15 0.79 0.78 0.79 0.74 0.79 0.80 0.84 0.79 0.81 0.84 0.80 15~25 0.87 0.86 0.87 0.85 0.88 0.89 0.92 0.88 0.90 0.92 0.89 >25 0.94 0.94 0.95 0.94 0.96 0.96 0.98 0.95 0.97 0.99 0.96
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表 3 2006—2015年晋城市不同地理单元下植被覆盖指数变化
Table 3. Changes of vegetation coverage index by geographical units in Jincheng City during 2006-2015
地区 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 晋城市 0.82 0.82 0.83 0.79 0.83 0.84 0.88 0.83 0.85 0.87 城区 0.83 0.81 0.82 0.83 0.83 0.85 0.89 0.81 0.84 0.86 沁水县 0.85 0.84 0.85 0.81 0.85 0.88 0.89 0.86 0.88 0.90 高平市 0.74 0.72 0.72 0.65 0.68 0.73 0.78 0.70 0.73 0.78 陵川县 0.89 0.88 0.88 0.88 0.90 0.89 0.94 0.88 0.91 0.93 阳城县 0.83 0.84 0.85 0.79 0.87 0.86 0.89 0.86 0.88 0.89 泽州县 0.77 0.76 0.77 0.74 0.77 0.79 0.83 0.77 0.79 0.82
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