Response of vegetation restoration to climate change and human activities in Shaanxi-Gansu-Ningxia Region
Action anthropique ; Années 2000-2009 ; Changement climatique ; Chine ; Développement durable ; Espace-temps ; Gansu ; Gestion de l'environnement ; Indice de végétation ; Ningxia ; Restauration écologique ; Shaanxi ; Végétation
China ; Climatic change ; Ecological restoration ; Environmental management ; Gansu ; Human impact ; Ningxia ; Shaanxi ; Space time ; Sustainable development ; Vegetation ; Vegetation index
In order to monitor the vegetation variations and clarify the causes of rehabilitation in the Shaanxi-Gansu-Ningxia Region, this paper, based on the MODIS-NDVI and climate data during the period of 2000–2009, analyzes the main characteristics
, spatial-temporal distribution and reasons of vegetation restoration, using methods of linear regression, the Hurst Exponent, standard deviation and other methods. From 2000 to 2009, the NDVI of the study area was improved progressively, with a linear
tendency. The vegetation restoration is characterized by 2 fast-growing periods, with an S-shaped increasing curve. Climate change and human activities are 2 driving forces in vegetation restoration; moreover anthropogenic factors such as Grain for Green
Project were the main causes leading to an increasing trend of NDVI on local scale. The Hurst Exponent of NDVI time series shows that the vegetation restoration was sustainable.
In this study, based on advanced remote sensing and Geographic Information Systems (GIS) technologies, the influences of precipitation, soil, topography and vegetation on soil erosion sensitivity are evaluated. An index system and the classification