Abstract: It is important to investigate the vegetation carbon storage for assessing the ecological services of ecological restoration measures in karst areas of southwest China, where the Grain for Green Program and ecological emigration have been deployed since 1999. The temporalspatial dynamics of vegetation carbon storage in the typical karst region of northwest Guangxi during 2000-2010 were analyzed based on MODIS remote sensing data and weather data in couple of the technique of geographic information system. Vegetation net primary productivity (NPP) and net ecosystem production (NEP) tended to increase with fluctuation during 2000-2010, with annual NPP and NEP of 396.61 g C·m^-2 and 370.58 g C·m^-2, respectively, and the percentages of area with significant changes (P<0.05) for NPP and NEP were 21.14% and 18.09%, respectively. With regard to spatial distribution, greater values were recorded in the western nonkarst areas (NPP: 422.73 g C·m^-2; NEP: 397.25 g C·m^-2), while the largest increments of NPP and NEP were recorded in the eastern part of restoration area of karst rocky desertification (NPP 34.20 g C·m^-2, NEP 30.30 g C·m^-2) (P<0.05). No significant correlation was found between annual NPP, NEP and precipitation or temperature. This study suggests that the vegetation carbon storage has been significantly increased by ecological restoration measures, such as ecological emigration, Grain for Green Program and accordingly the ecological services have been improved in this region.

Key words: isotonic salt stress, drought stress, photosynthetic characteristic, chloroplast ultrastructure, tomato