Normalized litterfall measurements for 16 Amazon forest studiy sites

Monthly litterfall productivity measurements (Normalized be the mean and standard deviation) for 16 study sites in the Amazon forest. The dataset contains Latitude (lat), Longitude (lon), site name (site), enhanced vegetaiton index, normalized by mean and SD (EVI) and smooth by a spline (EVI_spline); and litterfall, normalized by mean and SD (lit), and smoothed by a spline (lit_spline). For each site, there is 12 values corresponding to the monthly values of litterfall and EVI (the first is january)