欢迎访问《中国农学通报》，
中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (16): 117-124.doi: 10.11924/j.issn.1000-6850.2012-0078

所属专题： 农业气象

• 林学 园艺 园林 • 上一篇    下一篇

近10年浙江植被物候的遥感监测及时空动态

何月 樊高峰 张小伟 高大伟 胡波   

  • 收稿日期:2012-01-09 修回日期:2012-02-16 出版日期:2012-06-05 发布日期:2012-06-05
  • 基金资助:

    中国气象局气候变化专项《浙江省植被覆盖及其对气候变化的响应》

Vegetation Phenology Monitoring and Spatio-temporal Dynamics in Zhejiang Province in Past 10 Years

  • Received:2012-01-09 Revised:2012-02-16 Online:2012-06-05 Published:2012-06-05

PDF (PC)

677

摘要：

为了全面认识浙江植被物候变化规律，进一步完善区域气候变化的植被响应机制，基于改进的Savitzky-Golay滤波算法重构了2001—2010年MODIS NDVI时间序列数据，利用分段多项式拟合和动态阈值法提取了浙江省近10年的植被重要物候期（生长季开始时间、结束时间和生长季长度），分析植被物候期的年际变化趋势和空间分异特征。结果表明：（1）浙江省植被生长季为3月下旬—11月中旬，平均生长季长度为222天。近10年的生长季开始时间有提前趋势，但提前不显著，结束时间显著推迟，生长季有所延长，每10年延长约7天。（2）浙江植被的生长季开始时间从北往南逐渐推迟，生长季结束时间相对集中。浙江植被生长季延长的区域面积和生长季缩短的区域面积相当。（3）不同植被类型物候特征差异较大，分析针叶林和灌丛草地2类典型样区植被的物候变化发现，灌丛草地NDVI的年内和年际变幅均较针叶林的大，且针叶林的平均生长季长度比灌丛草地短约35天，针叶林生长季有延长的趋势，而灌丛草地生长季变化不明显。

关键词: 生理指标, 生理指标

Abstract:

In order to understand the vegetation phenological variation of Zhejiang Province comprehensively and further improve the vegetation response to climate change mechanism, the vegetation phenological metrics (the beginning data, the ending data and length of growing season) and its spatio-temporal variation in Zhejiang Province were analyzed, based on the reconstructed MODIS NDVI time-series using the improved Savitzky-Golay filter. To explore the vegetation phenology from 2001 to 2010, a polynomial fitting and dynamic threshold method were utilized. The results showed that vegetation growing season of Zhejing Province started in late March and ended in mid November, the average length of growing season was about 222 days. In past 10 years, the beginning time of growing season expressed the advance trend, but not significant, while the ending time was significantly delayed, the length of growing season was extended, about 7 days every 10 years. The spatial pattern of the begging time of growing season was embodied by transition from south to north, the ending time was relatively concentrated. Vegetation growing season of extended area was similar of the shortened area. Phenological characteristics of different vegetation types showed great differences. Coniferous forest and shrub grassland of the typical vegetation phenological changes were analyzed, the NDVI variation of shrub grassland was larger than coniferous forest both in annual and inner-annual. Coniferous forest growth season was shorter than the shrub grassland about 35 days, and extension of the trend, while shrub grass growing season changed not obviously.