Changes of NDVI in Different Areas of Shaanxi Province and Its Responses to Climate Factor
The spatial distribution and dynamic changes of vegetation in Shaanxi Province were analyzed using SPOT VEGETATION data for recent ten years.The NDVI values of different regions including the southern, Guanzhong and the northern areas were compared in regard to annual and monthly variations.It was showed that Shaanxi Province had good vegetation coverage that improved slightly as a whole during the past years.Annual average NDVI of the three regions were increasing each year, with increasing rates of the southern area＞ Guanzhong area＞the northern area.By comparison, we found the vegetation NDVI had significant monthly and less significant annual correlations with temperature and precipitation in different areas.The responses vegetation NDVI showed no significant time lag to temperature and precipitation and exhibited noticeable lag to sunshine variations in Southern Shaanxi area.In Guanzhong and Northern Shaanxi area, in the response of NDVI was found one month of time lag to temperature and sunshine lagged while no lag to precipitation.
国家科技期刊平台
NSTL
万方数据
维普
