NET PRIMARY PRODUCTION
; WATER-USE EFFICIENCY
; FOREST PRODUCTIVITY
; ECOSYSTEM PRODUCTIVITY
; STABLE-ISOTOPES
; CLIMATE-CHANGE
; DATA SETS
; CARBON
; CELLULOSE
; SATELLITE
WOS学科分类:
Multidisciplinary Sciences
WOS研究方向:
Science & Technology - Other Topics
英文摘要:
Historical and future trends in net primary productivity (NPP) and its sensitivity to global change are largely unknown because of the lack of long-term, high-resolution data. Here we test whether annually resolved tree-ring stable carbon (delta C-13) and oxygen (delta O-18) isotopes can be used as proxies for reconstructing past NPP. Stable isotope chronologies from four sites within three distinct hydroclimatic environments in the eastern United States (US) were compared in time and space against satellite-derived NPP products, including the long-term Global Inventory Modeling and Mapping Studies (GIMMS3g) NPP (1982-2011), the newest high-resolution Landsat NPP (1986-2015), and the Moderate Resolution Imaging Spectro-radiometer (MODIS, 2001-2015) NPP. We show that tree-ring isotopes, in particular delta O-18, correlate strongly with satellite NPP estimates at both local and large geographical scales in the eastern US. These findings represent an important breakthrough for estimating interannual variability and long-term changes in terrestrial productivity at the biome scale.