Although increasing attention has been paid to upward shift of plant species in altitude as a response to global warming,research on this phenomenon at low altitudinal and low latitudinal zones did not receive enough ...Although increasing attention has been paid to upward shift of plant species in altitude as a response to global warming,research on this phenomenon at low altitudinal and low latitudinal zones did not receive enough attention.In this study,an investigation was carried out to test the relationship between the upward spread of Moso bamboo(Phyllostachys pubescens) along altitudinal gradient and the increasing air temperature over the past decade within the Tianmu Mountain region,situated in southeastern China.Results showed that the peak elevation of Moso bamboo population establishment rose by an average of 9.8 m(±2.7 m) during the past decade and significant correlation existed with mean annual temperature(P < 0.0001,n = 339) but not with annual precipitation(P = 0.7,n = 339),indicating that the upward shift of Moso bamboo along altitudinal gradients was driven primarily by warming temperatures.This upward shift could potentially reduce biodiversity by altering the species composition of the ecosystem.However,there is also the potential for increased carbon sequestration capacity of local forest systems,which would produce an additional carbon sink to combat rising atmospheric CO 2 concentrations and future global warming.展开更多
It has been argued that increased soil respiration would become a major atmospheric source of CO\-2 in the event of global warming. The simple statistical models were developed based on a georeferenced database with 0...It has been argued that increased soil respiration would become a major atmospheric source of CO\-2 in the event of global warming. The simple statistical models were developed based on a georeferenced database with 0 5°×0 5° longitude/latitude resolution to simulate global soil\|CO\-2 fluxes, to investigate climatic effects on these fluxes using sensitivity experiments, and to assess possible responses of soil\|CO\-2 fluxes to various climate change scenarios. The statistical models yield a value of 69 PgC/a of global soil\|CO\-2 fluxes for current condition. Sensitivity experiments confirm that the fluxes are responsive to changes in temperature, precipitation and actual evapotranspiration, but increases in temperature and actual evapotranspiration affect soil\|CO 2 fluxes more than increases in precipitation. Using climatic change projections from four global circulation models, each corresponding to an equilibrium doubling of CO 2, it can be found that the largest increases in soil\|CO 2 fluxes were associated with the boreal and tundra regions. The globally averaged soil\|CO 2 fluxes were estimated to increase by about 35% above current values, providing a positive feedback to the greenhouse effect.展开更多
基金funded by the National Nature Science Foundation of China (Grant No. 31070440,31270517)China QianRen Program,NSERC-Discovery GrantZhejiang A & F University Research and Development Fund (2012FR023)
文摘Although increasing attention has been paid to upward shift of plant species in altitude as a response to global warming,research on this phenomenon at low altitudinal and low latitudinal zones did not receive enough attention.In this study,an investigation was carried out to test the relationship between the upward spread of Moso bamboo(Phyllostachys pubescens) along altitudinal gradient and the increasing air temperature over the past decade within the Tianmu Mountain region,situated in southeastern China.Results showed that the peak elevation of Moso bamboo population establishment rose by an average of 9.8 m(±2.7 m) during the past decade and significant correlation existed with mean annual temperature(P < 0.0001,n = 339) but not with annual precipitation(P = 0.7,n = 339),indicating that the upward shift of Moso bamboo along altitudinal gradients was driven primarily by warming temperatures.This upward shift could potentially reduce biodiversity by altering the species composition of the ecosystem.However,there is also the potential for increased carbon sequestration capacity of local forest systems,which would produce an additional carbon sink to combat rising atmospheric CO 2 concentrations and future global warming.
文摘It has been argued that increased soil respiration would become a major atmospheric source of CO\-2 in the event of global warming. The simple statistical models were developed based on a georeferenced database with 0 5°×0 5° longitude/latitude resolution to simulate global soil\|CO\-2 fluxes, to investigate climatic effects on these fluxes using sensitivity experiments, and to assess possible responses of soil\|CO\-2 fluxes to various climate change scenarios. The statistical models yield a value of 69 PgC/a of global soil\|CO\-2 fluxes for current condition. Sensitivity experiments confirm that the fluxes are responsive to changes in temperature, precipitation and actual evapotranspiration, but increases in temperature and actual evapotranspiration affect soil\|CO 2 fluxes more than increases in precipitation. Using climatic change projections from four global circulation models, each corresponding to an equilibrium doubling of CO 2, it can be found that the largest increases in soil\|CO 2 fluxes were associated with the boreal and tundra regions. The globally averaged soil\|CO 2 fluxes were estimated to increase by about 35% above current values, providing a positive feedback to the greenhouse effect.
