基于NOAA AVHRR数据的京津冀地区植被覆盖的时空变化 |
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引用本文: | 王书冰,向亮,吴云龙,李静. 基于NOAA AVHRR数据的京津冀地区植被覆盖的时空变化[J]. 中国农学通报, 2014, 30(34): 133-139 |
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作者姓名: | 王书冰 向亮 吴云龙 李静 |
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作者单位: | 河北省辛集市气象局 |
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基金项目: | 基金项目:公益性行业(气象)科研专项“遥感技术在作物生长模式及农业气象预报中的应用研究”(GYHY201106027)资助。 |
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摘 要: | 本研究利用京津冀地区83个站点近29年(1982—2010年)归一化植被指数(NDVI)数据,研究京津冀地区植被覆盖的时空变化特征。采用气候倾向率、相关分析、经验正交函数EOF分解等方法,分别从月、季和年多个时间尺度以及空间变化尺度,详细分析了京津冀地区植被覆盖的基本特征,结果表明:(1)近29年京津冀地区植被覆盖整体呈微弱的增加趋势,年际波动较大;春季植被覆盖上升趋势最为明显,其次是秋季和冬季,夏季植被变化率与年变化相关性最强;4—6月为植被主要生长期,7月植被覆盖增长率最高,8月、10月和11月为弱的减少趋势。(2)整个研究区植被覆盖空间分布差异较大,其中河北南部、北京东北部的燕山附近区域植被覆盖最好(NDVI均值>0.4),低值区主要位于张家口北部,其中张家口的康保站年平均NDVI值为0.15,为研究区最低;EOF分析表明,整个研究区植被增加明显的区域为河北中南部,时间系数表明京津冀地区植被覆盖1982—1999年为增长期,2000—2002年有所减少,2003—2010年有明显增加。
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关 键 词: | 京津冀;归一化植被指数;变化特征 |
收稿时间: | 2014-08-30 |
修稿时间: | 2014-08-30 |
Temporal-spatial Variation of Vegetation Coverage Around Hebei Area Based on the NOAA AVHRR Data |
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Abstract: | Based on normalized difference vegetation index (NDVI) data of 83 sites in the Beijing-Tianjin- Hebei Region during recent 29 years (1982-2010), temporal and spatial variations of vegetation cover of the Beijing-Tianjin-Hebei region were studied. The climate tendency rate, correlation analysis, empirical orthogonal function EOF decomposition methods were taken to analyze the basic characteristics of vegetation coverage of the Beijing-Tianjin-Hebei Region from the month, season and year time scale and spatial scale, a detailed analysis. The results showed that : (1) in recent 29 years, vegetation coverage of the Beijing-Tianjin-Hebei Region had a slight increase in the overall trend with heavy inter-annual fluctuations; spring vegetation coverage increased most obviously, followed by that of autumn and winter, summer vegetation change rate and the annual variation had the strongest correlation; vegetation growth period of vegetation coverage were mainly from April to June, the highest growth rate occurred in July, August, October and November had decreasing trends; (2) vegetation distribution of the entire research area had great differences, southern Hebei and northeastern Beijing along Yanshan mountain had the best vegetation coverage (NDVI mean>0.4), low value area are mainly located in northern Zhangjiakou, which Zhangjiakou Kangbao station, its annual average NDVI value was 0.15, the lowest in the study area; EOF analysis showed that, the whole Research area vegetation increased significantly in the region of southern Hebei, the time coefficient showed that vegetation in Beijing-Tianjin-Hebei region increased during 1982-1999, decreased during 2000-2002 and increased significantly during 2003-2010. |
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Keywords: | Beijing-Tianjin-Hebei NDVI variation characteristics |
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