Litterfall in tabonuco (subtropical wet) forest in the Luquillo Experimental Forest, Puerto Rico (MRCE Litterfall data)

Treatments common to both sites are quarterly fertilization (macro- and micronutrients) and unmanipulated. At El Verde, a third set of plots was subject to a one time removal of litter and woody debris generated by Hurricane Hugo (September 1989).两个试验站点共通的处理措施包含季度施肥（施加大量营养元素与微量营养元素）以及无人工干预的处理。在埃尔韦尔德（El Verde）试验点，第三组样地接受了一次性清除1989年9月雨果飓风（Hurricane Hugo）所产生的枯落物与木质残体的处理。