Net Primary Productivity (NPP) of vegetation is the net increase in biomass per unit area per unit time obtained by terrestrial vegetation through photosynthesis to fix solar energy. NPP, as an important component of carbon cycling in terrestrial ecosystems, plays a crucial role in controlling the increase of CO ₂ concentration in the atmosphere. It is the result of the mutual adaptation between the biological characteristics of plants and the external environment. It is not only the material and energy basis for the survival of heterotrophic organisms, but also a key link in the biogeochemical cycle. It is one of the important indicators for evaluating the stability of ecological structure and function. Due to the direct impact of photosynthesis on vegetation's NPP, the Normalized Difference Vegetation Index (NDVI) can accurately reflect the greenness of vegetation and the intensity of photosynthesis. Therefore, in regional and global ecosystem models, NDVI is often directly or indirectly used to calculate vegetation NPP.
The data source of this dataset is MOD17A3HGF.v006 version data, involving segmented image grids of h25v04, h25v05, and h26v05, with a spatial resolution of 500 meters, a time resolution of 1 year, and a data format of hdf.
Original product, untreated.
The data quality is good.
NPP data unit is kgC/m ²/ Year, effective range -30000-32700, scaling factor 0.0001, filling value range 32761-32767, where: 32761 is unclassified land type, 32762 is urban built-up area, 32763 is permanent wetland or submerged swamp land, 32764 is perennial snow or ice covered area, 32765 is barren and sparse area (such as rocks, tundra, and desert), 32766 is inland freshwater covered area, and 32767 is filling value for other situations.
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CSTR:11738.11.NCDC.GSEER.DB4148.2023
10.12072/ncdc.gseer.db4148.2023