| 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： | 2014/8/30 0:00:00 |
| 修稿时间： | 2014/8/30 0:00:00 |
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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