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Inner Mongolia Normal University (2019)

Effects of Climate and Land Use Change on Vegetation NDVI in the Three North Region

道日娜;

Titre : Effects of Climate and Land Use Change on Vegetation NDVI in the Three North Region

Auteur : 道日娜;

Grade : Master’s Theses 2019

Université : Inner Mongolia Normal University

Résumé partiel
The Three North region is the most severe desertification area in China.In order to improve the ecological environment in this area,China started the construction project of three-north shelter forest in 1987.This paper mainly used NDVI,temperature and precipitation data,combined with mean method,trend analysis,thin plate smoothing spline,Mann-Kendall nonparametric detection method,Hurst index analysis,correlation analysis and multiple linear regression analysis.The temporal and spatial variations of vegetation NDVI,temperature and precipitation were studied in three-north shelterbelt project area from 1982 to 2015,and the influence of temperature,precipitation and LULC change on NDVI were further analyzed.The main conclusions are as follows :(1)The overall spatial distribution of vegetation cover in the study area is higher in the northeast and north China plain agricultural areas,NDVI in the northwest desert area is low,the hilly and gully area on the Loess Plateau gradually decreases from south to north,and NDVI in the sandstorm area gradually increases from west to east.From 1982 to 2015,the average annual maximum NDVI was 0.37 in the study area.The annual maximum NDVI showed an upward trend and 79.87% of the NDVI trend in the study area has no obvious change.The variation trend of NDVI showed obvious strong continuity.NDVI showed a fluctuating upward trend in the growing season,with an average of 0.32 in many years.The trend of NDVI was basically unchanged in most regions during the growing season.The seasonal NDVI from large to small is summer,autumn and spring,and NDVI has an upward trend.The spatial distribution of NDVI was similar to that of annual maximum NDVI and growth season average NDVI.NDVI has strong seasonal variation during the year.(2)The spatial distribution of annual precipitation showed that the annual precipitation in the desert areas of Northwest China is generally less than 200 mm except Tianshan Mountains,Kunlun Mountains,Qilian Mountains and Altai Mountains.The precipitation in the other three zones decreased gradually from southeast to northwest.The annual average precipitation is 299.8mm,and the precipitation have decreasing trend,and precipitation had a reduced mutation in 1987.The spatial distribution law of precipitation in the growing season is basically consistent with the annual precipitation.The average annual precipitation was 245.6 mm,and the precipitation in the growing season in 1992 produced a reduction in the mutation.

Mots clés : Three-North Shelterbelt Project Area; NDVI; Temperature; Precipitation; Spatiotemporal change; Land Cover and Land Use;

Présentation (CNKI)

Page publiée le 23 mai 2020