title: [Variability of vegetation growth season in different latitudinal zones of North China: a monitoring by NOAA NDVI and MSAVI].
abstract: In this study, North China was latitudinally divided into five zones, i.e., 32 degrees - 36 degrees N (Zone I), 36 degrees - 40 degrees N (Zone II), 40 degrees - 44 degrees N (Zone III), 44 degrees - 48 degrees N (Zone IV) and 48 degrees - 52 degrees N (Zone V), and the NOAA/ AVHRR NDVI and MSAVI time-series images from 1982 to 1999 were smoothed with Savitzky-Golay filter algorithm. 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 the prolonging time exceeded 10 days.
authors.affiliation: Key Laboratory of Environmental Change and Natural Disaster of Education Ministry, College of Resources Science and Technology, Beijing Normal University, Beijing 100875, China. wanghong@ires.cn
authors.forename: Hong
authors.initials: H
authors.lastname: Wang
authors.forename: Xiaobing
authors.initials: X
authors.lastname: Li
authors.forename: Ruibo
authors.initials: R
authors.lastname: Han
authors.forename: Yongqin
authors.initials: Y
authors.lastname: Ge
mesh_terms: D002681:China; D002980:Climate; D003625:Data Collection; D004463:Ecology; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D005843:Geography; D063245:Plant Development; D017215:Satellite Communications; D012621:Seasons