Annual Net Primary Production on the Main Cropping System Experiment at the Kellogg Biological Station, Hickory Corners, MI (1990 to 2018)

Dataset Abstract Aboveground annual net primary production (ANPP) has been measured on the LTER main site since 1990 and on the successional and forested sites since 1993. ANPP is measured at peak biomass for a given treatment. In some systems with multiple harvests or complex communities that have peaks occurring at different times of the year, measurements are taken at multiple times per year. Additional ANPP measurements are made where appropriate using leaf litter traps, estimates of diameter from tree basal diameter and for the poplar treatment occasional destructive harvests. See the ANPP protocol for descriptions of the sampling and measurement methods for each of the treatments. original data source http://lter.kbs.msu.edu/datasets/22

数据集摘要：地上年净初级生产力（Aboveground Annual Net Primary Production, ANPP）的测定工作自1990年起便在长期生态研究（Long Term Ecological Research, LTER）主站点开展，1993年起拓展至演替站点与森林站点。
ANPP的测定选取对应处理组的生物量峰值时段进行。针对存在多次收获需求、或物候峰值分布于全年不同时段的复杂群落生态系统，研究人员会在一年内开展多次采样测定。
此外，在适宜场景下，研究人员还会通过凋落物收集器法、树木基径直径估算法补充ANPP测定数据，并针对杨树处理组开展偶发性破坏性收获采样。
各处理组的采样与测定方法详情请参见ANPP测定规程。原始数据来源：http://lter.kbs.msu.edu/datasets/22