Vegetation Change in China
Figure 1. Major geographical regions in China, together with location of climatic stations used. There are 680 stationsacross China.
Figure 2. Spatial patterns of 18-year averaged (a) annual temperature and (b) precipitation over the
study period from 1982 to 1999.
Figure 3. (a) Vegetation map of China derived from ground observations. China’s vegetation was grouped into the following 10 types as shown in FIg.3a: evergreen broadleaf forests, deciduousbroad-leaf forests, broadleaf and needleleaf forests, evergreen needleleaf forests, deciduous needleleaf forests, broadleaf shrubs, temperate grasslands, alpine meadows andtundra, deserts, and cultivation.
(b) map of annual mean NDVI calculated from
the 18-year NDVI data set from 1982 to 1999.
Vegetation change in China from 1982 to 1999 (Research B)
Topography, temperature and precipation information about China. The three factors influence the vegetation types.
Fig 5A, 6A and 7A show the NDVI change in spring (March to May), summer (June to August) and autumnn (September to November), represently. Figure 5a shows significant increase (blue) or decrease (red) in NDVI in spring over the 18 years. Fig B show the correlation between (b) NDVI and temperature. Fig C show the correlation between NDVI and precipitation.
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Fig.4 shows the change in NDVI, temperature and precipitation in summer, autumn and spring from 1982 to 1999.
Fig4(a) indicate the NDVI increased. Therefore, Chinese vegetation increased from 1982 to 1999.
Fig.8 NDVI increase/decrease on the area base for three different seasons in China. It is the result after analyzing Fig5, 6, 7. Fig8(b) indicate that most vegetation increased but not significant in three seasons. The vegetation in China increased by observing the histogram.
Fig9 show NDVI,temperature and precipitation change in different months. It is helpful to the seasonal change research.
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Fig.10 shows the NDVI seasonal change in different vegetation types.