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

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 Resources in this dataset:Resource Title: Website Pointer to html file. File Name: Web Page, url: https://portal.edirepository.org/nis/mapbrowse?scope=knb-lter-kbs&identifier=19 Webpage with information and links to data files for download

自1990年起，在LTER主要研究站对地上年净初级生产力（ANPP）进行了测量，自1993年起在演替和森林站点进行了测量。ANPP的测量是在特定处理方法的峰值生物量时进行的。在某些系统，如每年有多次收获或社区结构复杂且峰值出现在不同时间的情况下，将在一年中多次进行测量。在适当的位置，通过使用叶片凋落陷阱、树木基径直径的估计以及对于杨树处理偶尔进行破坏性收获，进行额外的ANPP测量。有关每种处理的采样和测量方法的描述，请参阅ANPP协议。