Abstract:

Taking Yongde Snow Mountain National Nature Reserve and surrounding areas in Lincang City of Yunnan Province as the experimental area,the characteristics of burned area that have the most instructive influence of human disturbances at the surrounding of nature reserve as the research objects,Normalized Difference Vegetation Index (NDVI) and Normalized Burn Ratio (NBR) as well as correlation algorithms,the rapid identification,quantification and location analysis about the burned area affected by human disturbance were obtained.The results showed that:1) In different remote sensing periods,the spatial distribution of vegetation coverage within the boundary of the nature reserve was relatively stable. While outside the boundary,the vegetation coverage decreased with the increasing of the buffer distance.2) Within the boundary of the nature reserve,the presence of a small number of burned areas could be monitored. However,outside the nature reserve,the burned area showed increasing with the rise of buffer distance.3)Investigating and analyzing of the causes which led to the burned areas spatial changes in the study area were couducted.The objective distribution of rural residential around the nature reserve was an important driving factor affecting the vegetation coverage and burned area.There was a close spatial correlation between the distribution of rural residential and the vegetation coverage as well as distribution of burned area in nature reserve.It is necessary to seek the mitigation measures in order to study the impact of rural settlements at the surrounding of nature reserve on human disturbances in nature reserve.

Key words: nature reserve, NDVI, vegetation coverage, NBR, burned area