Grassland responses to global environmental changes suppressed by elevated CO2

被引:422
作者
Shaw, MR
Zavaleta, ES
Chiariello, NR
Cleland, EE
Mooney, HA
Field, CB
机构
[1] Carnegie Inst Sci, Dept Global Ecol, Stanford, CA 94305 USA
[2] Stanford Univ, Dept Biol Sci, Stanford, CA 94305 USA
[3] Stanford Univ, Jasper Ridge Biol Preserve, Stanford, CA 94305 USA
关键词
D O I
10.1126/science.1075312
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Simulated global changes, including warming, increased precipitation, and nitrogen deposition, alone and in concert, increased net primary production (NPP) in the third year of ecosystem-scale manipulations in a California annual grassland. Elevated carbon dioxide also increased NPP, but only as a single-factor treatment. Across all multifactor manipulations, elevated carbon dioxide suppressed root allocation, decreasing the positive effects of increased temperature, precipitation, and nitrogen deposition on NPP. The NPP responses to interacting global changes differed greatly from simple combinations of single-factor responses. These findings indicate the importance of a multifactor experimental approach to understanding ecosystem responses to global change.
引用
收藏
页码:1987 / 1990
页数:4
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