title: Convergence of terrestrial plant production across global climate gradients.
abstract: Variation in terrestrial net primary production (NPP) with climate is thought to originate from a direct influence of temperature and precipitation on plant metabolism. However, variation in NPP may also result from an indirect influence of climate by means of plant age, stand biomass, growing season length and local adaptation. To identify the relative importance of direct and indirect climate effects, we extend metabolic scaling theory to link hypothesized climate influences with NPP, and assess hypothesized relationships using a global compilation of ecosystem woody plant biomass and production data. Notably, age and biomass explained most of the variation in production whereas temperature and precipitation explained almost none, suggesting that climate indirectly (not directly) influences production. Furthermore, our theory shows that variation in NPP is characterized by a common scaling relationship, suggesting that global change models can incorporate the mechanisms governing this relationship to improve predictions of future ecosystem function.
authors.affiliation: Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA.
authors.forename: Sean T
authors.initials: ST
authors.lastname: Michaletz
authors.affiliation: Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Normal University, Ministry of Education, Fuzhou, Fujian Province 350007, China.
authors.forename: Dongliang
authors.initials: D
authors.lastname: Cheng
authors.affiliation: Department of Biology, Kenyon College, Gambier, Ohio 43022, USA.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Kerkhoff
authors.affiliation: 1] Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721, USA [2] The Santa Fe Institute, USA, 1399 Hyde Park Road, Santa Fe, New Mexico 87501, USA [3] The iPlant Collaborative, Thomas W. Keating Bioresearch Building, 1657 East Helen Street, Tucson, Arizona 85721, USA [4] Aspen Center for Environmental Studies, 100 Puppy Smith Street, Aspen, Colorado 81611, USA.
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Enquist
mesh_terms: D000222:Adaptation, Physiological; D018533:Biomass; D002980:Climate; D017753:Ecosystem; D038622:Internationality; D063245:Plant Development; D010944:Plants / Q000378:metabolism*; D011891:Rain; D012621:Seasons; D013696:Temperature; D014934:Wood