摘要
利用MODIS数据建立近7年和静县NDVI时间序列,通过采用均值法、最大合成法和一元线性回归法,分析了该区不同植被类型年内变化、年际变化趋势。结果表明,和静县植被季相变化明显,不同植被类型变化幅度差异显著;近7年大部分地区植被存在退化趋势,局部区域植被有所改善;不同植被类型退化程度从大到小为荒漠草原>荒漠植被>草原>高山垫状植被>高寒草原>草甸+沼泽>落叶阔叶林>耕地;平原区植被NDVI的变化主要受人为活动的影响,山区植被NDVI除受季节性放牧影响外,更多的受气候变化的影响。
In this paper, we built NDVI time series by 250m MODIS data covered in HeJing county during 2001 - 2007, and analyzed the annual and monthly NDVI change of different vegetation types using three methods, which are average value method, maximum-value composite and slope map of Nf）VI method. As a result, vegetation seasonai change is remarkable,there is a marked change quantity of different vegetation types. The vegetation degradation is popular in most of the county in the past 7 years, however, there are some region where vegetation coverage is increasing. Ranking of different vegetation types degradation during 2001 ~ 2007 is desert steppe 〉 desert vegetation 〉 steppe 〉 high-mountain vegetation 〉 cold high mountain steppe 〉 meadow ＋ swamp 〉 evergreen broadleaf 〉 cropland. Human aetivily has a mainly influence on NDVI value in Plain. Climate change has a more remarkable influence than seasonal grazing on NDVI value in mountain area.
出处
《中国环境监测》
CAS
CSCD
北大核心
2008年第5期69-74,共6页
Environmental Monitoring in China
关键词
遥感
植被类型
NDVI
变化趋势
Remote sensing
Vegetation types
NDVI
Change trend
