GREATER YELLOWSTONE ECOSYSTEM
; CONTERMINOUS UNITED-STATES
; LODGEPOLE PINE FORESTS
; NET PRIMARY PRODUCTION
; SUB-ALPINE FORESTS
; NDVI DATA SETS
; FIRE REGIMES
; TIME-SERIES
; BIOTIC DISTURBANCES
; SATELLITE DATA
WOS学科分类:
Ecology
WOS研究方向:
Environmental Sciences & Ecology
英文摘要:
Productivity of northern latitude forests is an important driver of the terrestrial carbon cycle and is already responding to climate change. Studies of the satellite-derived Normalized Difference Vegetation Index (NDVI) for northern latitudes indicate recent changes in plant productivity. These detected greening and browning trends are often attributed to a lengthening of the growing season from warming temperatures. Yet, disturbance-recovery dynamics are strong drivers of productivity and can mask direct effects of climate change. Here, we analyze 1-km resolution NDVI data from 1989 to 2014 for the northern latitude forests of the Greater Yellowstone Ecosystem for changes in plant productivity to address the following questions: (1) To what degree has greening taken place in the GYE over the past three decades? and (2) What is the relative importance of disturbance and climate in explaining NDVI trends? We found that the spatial extents of statistically significant productivity trends were limited to local greening and browning areas. Disturbance history, predominately fire disturbance, was a major driver of these detected NDVI trends. After accounting for fire-, insect-, and human-caused disturbances, increasing productivity trends remained. Productivity of northern latitude forests is generally considered temperature-limited; yet, we found that precipitation was a key driver of greening in the GYE.
1.Montana State Univ, Dept Ecol, POB 173460, Bozeman, MT 59717 USA 2.US Forest Serv, Reg 1,26 Ft Missoula Rd, Missoula, MT 59804 USA 3.NASA, Goddard Space Flight Ctr, Biospher Sci Lab, Mail Code 618, Greenbelt, MD 20771 USA
Recommended Citation:
Emmett, Kristen D.,Renwick, Katherine M.,Poulter, Benjamin. Disentangling Climate and Disturbance Effects on Regional Vegetation Greening Trends[J]. ECOSYSTEMS,2019-01-01,22(4):873-891