摘要
对贺兰山区进行分区的基础上,运用SPOT-NDVI数据对1998～2010年四季不同区的植被演变进行研究。结果表明,贺兰山植被高海拔区域的平均覆盖最高,其次为中海拔区域,低海拔区域的东坡较高,其他区域覆盖较低。研究区植被的生长季为5～10月,其中植被覆盖最好为8月。近13a来,贺兰山植被总体表现为增长趋势,其中绝大部分区域的秋季植被增长,尤其是中高海拔区域。考虑到研究区干旱化的趋势以及对植被生长的影响,贺兰山(特别是低山地区)植被的增长趋势在未来可能难以持续。
Based on the division of regions on Helan mountains,the vegetation changes of four seasons from 1998 to 2010 in different regions has been analyzed using the SPOT-NDVI data. The results shown that average vegetation cover was highest in high elevations and second highest in middle elevations, and then the low elevation areas. The vegetation cover on east slope of the study area was higher than the west slope, north part and south part of Helan mountains. The growth period of vegetation was from May to October, with the highest vegetation cover in August. The vegetation was generally getting better in the past 13 years, in which the vegetation grew better in autumn for most areas, especially in the middle and high eleva- tions areas. However,considering the negative effects of the climatic arid trend on vegetation growth in the study area, the trend of vegetation grow would probably reverse in the future.
出处
《遥感技术与应用》
CSCD
北大核心
2012年第1期142-148,共7页
Remote Sensing Technology and Application
基金
国家林业公益性行业专项(200804001)
中国人民大学科学研究基金项目(中央高校基本科研业务费)20100302814
