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.归一化差异植被指数（Normalized Difference Vegetation Index，NDVI）由反射可见光与红外辐射计算得到，对解析北极地区的生态变化具有关键意义，但目前直接将NDVI与北极苔原生态系统的结构与功能属性建立关联的地面验证工作仍相对较少。为优化对作为北极常见生态系统的湿润酸性苔原（moist acidic tundra，MAT）内NDVI动态变化的解译，本研究在两个生长季内，选取覆盖该生态系统典型植被全范围条件的70个湿润酸性苔原样地，同步开展了NDVI、植被结构以及二氧化碳通量的测定工作。