摘要
本文利用“3S”技术，结合气象观测资料，发现反映区域植被覆盖特征的遥感植被指数变化基本上与器测温度和降水变化相一致，显示出我国北方植被对气候短尺度变化响应敏感。荒漠化总体加剧深受气候变化的影响，人类活动起着相对加强或削弱的作用。
In recent years, many researchers attempted to monitor and research process of land cover change at a short time scale using earth observahon data by remote sensing.Temporal and spatial resolution were improved in these research, and they are very important to reduce non-certainty. On the basis of these, not only had they opened out process of regional land cover change at a short time scale, but also laid a solid foundahon for dishnguishing natural and human driving forces of these change. The relationship between terrestrial ecosystem and climate change is significant research content in global change research, and the relahonship between vegetahon and climate is one of the centres of research at all time. NOAA/AVHRR digita image is important data source in the research field ofland cover and vegetahon dynamic at a large scale. Many calculated parameters based on infrared light and near infrared light were sensihve to vegetahon growth status, produchvity, other biophysical and biochemical characterishc. NDVI(normalized difference vegetahon index) is a kind of solid vegetahon index, it has been used to describe physiological status of vegetahon, to estimate vegetahon cover degree, LAI(leaf area index), plant photosynthesis capability, exishng greenness biomass and productivity. In this research, the vegetation map based on multi-temporal NOAA/AVHRRNDVI images with 1km× 1km spatial resolution has been carried out and published[9].In mis research, the temperate meadow-steppe, the temperate typically steppe, the temperate desert steppe, the desert shrub with desert steppe and the temperate desert -the zonal vegetahon types in the arid and semi-arid regions in northem China-are chosen as objects of research. Firstly, we cany out the precision verification in the fleld for these vegetation types on the basis of global posihon system (GPS). There are 22 points, which cover three vegetation types in this research, show preferable corresponding relation betweenthe classification results and observahons. The classific
出处
《第四纪研究》
CAS
CSCD
北大核心
2000年第3期220-228,共9页
Quaternary Sciences
基金
国家自然科学基金!39899374
"九五"国家重大基础研究项目!95-22-02
关键词
气候变化
植被响应
遥感
3S', climate change, vegetation response
