NPP Study: Annual ground-based photographs of 15 NPP sites beginning 1996

Beginning in 1996, annual photos are taken from each of the 4 corners of each of the 15 70-meter x 70-meter NPP sites between August and November depending on other research activity constraints. The plots were established in early months of 1989. From 1996-2002 photos were taken using 35mm color slide film. Beginning in 2003, digital photos were taken in JPG format. Occasionally, supplemental photos may be taken at the same time that provide additional habitat information at the landscape, patch, or plant species level1996年起，需结合其他研究活动的约束条件，于每年8月至11月间，对15个70米×70米的净初级生产力（Net Primary Production, NPP）观测样地的4个角分别拍摄年度影像。该批样地于1989年年初设立。1996年至2002年期间，影像拍摄采用35毫米彩色反转片胶片。2003年起，采用JPG格式拍摄数码影像。此外，偶尔会在同期拍摄补充影像，以获取景观尺度、斑块尺度或植物物种层面的额外生境信息。