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利用NOAA NDVI和MSAVI遥感监测中国北方不同纬度带植被生长季变化

王宏;李晓兵;韩瑞波;盖永芹   

  1. 北京师范大学资源学院环境演变与自然灾害教育部重点实验室, 北京 100875
  • 收稿日期:2005-11-28 修回日期:2006-09-24 出版日期:2006-12-18 发布日期:2006-12-18

Variability of vegetation growth season in different latitudinal zones of North China: A monitoring by NOAA NDVI and MSAVI

WANG Hong; LI Xiaobing; HAN Ruibo; GE Yongqin   

  1. Key Laboratory of Environmental Change and Natural Disaster of Education Ministry, College of Resources Science and Technology,
    Beijing Normal University, Beijing 100875, China

  • Received:2005-11-28 Revised:2006-09-24 Online:2006-12-18 Published:2006-12-18

摘要: 将中国北方13个省按纬向划分为5个区域:32°~36°N(区域Ⅰ)、36°~40°N(区域Ⅱ)、40°~44°N(区域Ⅲ)、44°~48°N(区域Ⅳ)和48°~52°N(区域Ⅴ),然后利用Savitzky-Golay滤波算法平滑了1982~1999年NOAA/AVHRR NDVI和MSAVI时间序列影像,基于经验正交函数(EOF)分析提取了不同区域植被NDVI和MSAVI主分量,估测了1982~1999年中国北方不同纬度带的植被生长季开始、结束和长度,最后对1982~1999年不同区域的生长季参数进行了线性拟合,分析了不同区域的植被生长季变化趋势.研究表明,不同纬度带的植被生长季开始日期均表现出不同程度的提前趋势,区域Ⅳ的植被生长季开始提前趋势最大;生长季结束日期呈现推迟的趋势,区域Ⅱ的植被活动结束日期的推迟趋势最大,而区域Ⅲ最小.整个生长季长度呈延长趋势,延长日期在10 d以上.

关键词: 基塘模式, 农业生态工程, 能值, 可持续发展能力

Abstract: In this study, North China was latitudinally divided into five zones, i.e., 32°~36° N (Zone I), 36°~40° N (Zone II), 40°~44° N (Zone III), 44°~48° N (Zone IV) and 48°~52° N (Zone V), and the NOAA/AVHRR NDVI and MSAVI time-series images from 1982 to 1999 were smoothed with Savitzky-Golay filteralgorithm. Based on the EOF analysis, the principal components of NDVI and MSAVI for the vegetations in different latitudinal zones of North China were extracted, the annual beginning and ending dates and the length of growth season in 1982~1999 were estimated, and the related parameters were linearly fitted, aimed to analyze the variability of vegetation growth season. The results showed that the beginning date of the growth season in different zones tended to be advanced, while the ending date tended to be postponed with increasing latitude. The length of the growth season was also prolonged, with theprolonging time exceeded 10 days.

Key words: Dike-pond modes, Agro-ecological engineering, Energy value, Sustainable development ability