Assessing vegetation dynamics in the Three-North Shelter Forest region of China using AVHRR NDVI data |
| |
| Authors: | Hanchen Duan Changzhen Yan Atsushi Tsunekawa Xiang Song Sen Li Jiali Xie |
| |
| Institution: | (1) Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, No. 320, West Donggang Road, Lanzhou, 730000, Gansu, China;(2) Graduate University of Chinese Academy of Sciences, Beijing, 100049, China;(3) Arid Land Research Center, Tottori University, 1390 Hamasaka, Tottori 680-0001, Japan |
| |
| Abstract: | The Three-North Shelter Forest Programme (TNSFP) covers 551 Chinese counties and an area of 4,069,000 km2 mostly in arid and semi-arid regions. In this paper, we discuss the temporal and spatial changes in value of the normalized-difference
vegetation index (NDVI) in this region, and the relationships between NDVI and climatic factors (temperature and precipitation)
based on NOAA Advanced Very High Resolution Radiometer Global Inventory Modeling and Mapping Studies NDVI data with 8-km resolution
from 1982 to 2006. During the past 25 years, the vegetation cover has generally increased in eastern regions of China and
the oasis in the north piedmont of Tianshan Mountains, but has decreased northwest of Xinjiang and in the Hulunbeier Plateau.
The multi-year monthly average NDVI distribution map showed that NDVI increased from April to August, but in the western and
northern plateau areas, the lower temperatures and high altitude created a shorter growing season (1 or 2 months). The vegetation
of the study area has generally increased in the regions covered by the TNSFP. Linear regression analysis of the vegetation
cover showed an increasing trend over large areas. The largest annual growth rate per pixel (the slope of the regression)
was 0.009; the largest negative annual change was −0.004. The correlation between NDVI and precipitation was higher than that
between NDVI and temperature, suggesting that precipitation is the most important factor that affects NDVI changes in the
study area, especially for temperate desert vegetation in northwestern China. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
