基于MODIS植被指数和气象数据,采用趋势分析和地统计分析方法对关中盆地植被覆盖时空分布特征进行分析;借助基于像元的空间分析方法揭示研究区植被覆盖对气候变化的响应。结果表明:从年际变化特征看,关中盆地植被覆盖呈波动性上升趋势,年均增长率为0.006 1 a-1;从年内分布特征看,关中盆地植被覆盖年内波动明显,呈单峰型曲线;从空间分布特征看,关中盆地植被覆盖度呈现明显的空间异质性;从年尺度来看,关中盆地植被覆盖度与降雨量和温度均呈现不显著正相关;从月尺度来看,关中盆地植被覆盖度与当月降雨量和气温均呈现显著正相关,这说明水热因子的季节波动对研究区植被生长的影响更大。研究结果可为干旱半干旱地区生态建设和环境保护提供科学依据。
Abstract
In association with MODIS vegetation index and meteorological data, the temporal and spatial distribution characteristics of vegetation cover in the Guanzhong Basin were analyzed via trend analysis and geostatistical analysis. The response of vegetation coverage to climate change in the study area was also revealed using spatial analysis method based on pixel. Results unveil that in terms of annual variation, the vegetation cover of the Guanzhong Basin shows a fluctuating upward trend, with an annual growth rate of 0.006 1 a-1; in terms of intro-annual variation, the vegetation cover of the Guanzhong Basin fluctuates significantly during the year, showing a unimodal curve. On the other hand, from the aspect of spatial distribution, the vegetation coverage is of obvious spatial heterogeneity. In annual scale, the vegetation coverage in the Guanzhong Basin is insignificantly positively correlated with rainfall and temperature; in monthly scale, the vegetation coverage is significantly correlated with monthly rainfall and monthly temperature. Such significant positive correlations indicate that seasonal fluctuations in hydrothermal factors have a greater impact on vegetation growth in the study area. The research findings offer scientific basis for ecological construction and environmental protection in arid and semi-arid regions.
关键词
植被覆盖 /
降雨量 /
气温 /
时空动态 /
关中盆地
Key words
vegetation coverage /
rainfall /
temperature /
spatiotemporal dynamics /
Guanzhong Basin
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基金
陕西省教育厅科学研究计划项目(18JS037);陕西省高校科协青年人才托举计划项目(20180705);渭南师范学院自然科学类人才项目(18ZRRC04)
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