秦巴山区增强植被指数长时间序列变化及其自然影响因素分析

doi:10.19741/j.issn.1673-4831.2021.0728

摘要/Abstract

摘要： 秦巴山区是横跨我国南北地区的重要地理过渡带,为全面了解秦巴山区近20年的生态变迁及影响因素,基于MODIS-EVI数据,结合气温、降水和DEM数据,利用最大值合成法、趋势分析法和偏相关分析,以海拔为基础,分析了秦巴山区2000-2020年不同海拔高度上不同类型植被增强指数(EVI)的时空变化及其与气温、降水的相关性。研究结果表明:(1)2000-2020年秦巴山区植被年均EVI呈现波动上升趋势,有80.67%和13.29%的区域EVI呈现明显改善和轻微改善趋势,在海拔1 600~1 800 m处EVI变化处于相对稳定状态,较适宜植被生长。(2)栽培植被和阔叶林为秦巴山区主要植被类型,各植被类型EVI值由大到小依次为阔叶林、灌丛、针叶林、草地、栽培植被和其他,在1 000~2 000 m海拔区间植被面积占大多数,1 600~1 800 m为适宜植被自然生长的区间。(3)2000-2020年秦巴山区向暖湿方向发展,EVI与气温相关性在区域分布上较均匀,降水对植被EVI的影响强度要高于气温对其的影响强度;随着海拔高度的上升,植被 EVI与气温的相关性总体上高于其与降水的相关性。

关键词: 秦巴山区, 增强植被指数, 海拔变化, 气候因子

Abstract: The Qinling-Daba Mountains Range is an important geographical transition zone between northern and southern China. This paper aims to fully understand the ecological changes and the influencing factors in this area in the past 20 years. To achieve this, MODIS-EVI data were applied, combined with temperature, precipitation, and DEM data, and the maximum synthesis method, trend analysis method, and partial correlation analysis were used on the basis of altitude. Besides, temporal and spatial changes in the enhanced vegetation index (EVI) for different vegetation types at various altitudes and their correlation with temperature and precipitation from 2000 to 2020 were analyzed. The main conclusions are: (1) From 2000 to 2020, the average annual EVI of vegetation in the Qinling-Daba Mountains area presented a fluctuating upward trend. Overall, 80.67% of the area showed a significant improvement on EVI and 13.29% of the area showed a slight improvemont on EVI. The EVI was relatively stable at an altitude of 1 600-1 800 m, which is more suitable for vegetation growth. (2) Cultivated vegetation and broad-leaved forests are the main types of vegetation in the Qinling-Daba Mountains region. The EVI values of the various vegetation types range in the order of broad-leaved forest > shrub > coniferous forest > grassland > cultivated vegetation > others. The inter-vegetation area accounts for the majority of vegetation in the altitude range of 1 000-2 000 m, while the altitude range of 1 600-1 800 m is the most suitable for natural vegetation growth. (3) From 2000 to 2020, the climate in the Qinling-Daba Mountains area became warmer and more humid. The correlation between EVI and temperature was relatively uniform across the region, and the impact of precipitation on EVI was greater than that of temperature. However, at higher altitudes, the correlation between EVI and temperature is generally greater than precipitation.

Key words: Qinling-Daba Mountains area, EVI, altitude change, climatic factor

中图分类号:

X87
Q948

樊艺, 赵牡丹, 王建. 秦巴山区增强植被指数长时间序列变化及其自然影响因素分析[J]. 生态与农村环境学报, 2022, 38(6): 733-743.

FAN Yi, ZHAO Mu-dan, WANG Jian. Long Time Series Changes of Vegetation EVI and the Natural Influencing Factors in Qinling-Daba Mountains Area[J]. Journal of Ecology and Rural Environment, 2022, 38(6): 733-743.

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