Toolik Lake and Imnaviat Creek plot-level Normalized Difference Vegetation Index, Plant Functional Type Cover, and CO2 flux, 2010-2011

The Normalized Difference Vegetation Index (NDVI), derived from reflected visible and infrared radiation, has been critical to understanding change across the Arctic, but relatively few ground truthing efforts have directly linked NDVI to structural and functional properties of Arctic tundra ecosystems. To improve the interpretation of changing NDVI within moist acidic tundra (MAT), a common Arctic ecosystem, we coupled measurements of NDVI, vegetation structure, and CO2 flux in seventy MAT plots, chosen to represent the full range of typical MAT vegetation conditions, over two growing seasons.归一化差分植被指数（Normalized Difference Vegetation Index, NDVI）由反射可见光与红外辐射计算所得，其对解析北极地区的环境变化具有关键价值，但目前仅有相对较少的地面验证研究将NDVI与北极苔原生态系统的结构、功能属性直接关联。为优化北极常见生态系统湿酸性苔原（moist acidic tundra, MAT）内NDVI动态变化的解译效果，本研究在两个生长季中，选取可覆盖典型湿酸性苔原植被全部特征范围的70个样地，同步开展了NDVI、植被结构以及二氧化碳通量的测定工作。