day and night warming have different effect on root lifespan
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2012
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Abstract
Roots are key components of C cycling in terrestrial
ecosystems and play an important role in the regulation of response of
terrestrial ecosystems to global climate warming, which is predicted to
occur with greater warming magnitudes at night than during daytime across
different regions on the Earth. However, there has been no detailed study to
investigate the effect of asymmetrical warming on root dynamics at the level
of terrestrial ecosystems. To understand the effects of day and night
warming on root lifespan in the semiarid temperate steppe in northern China,
a field study with a full factorial design including control, day warming,
night warming and continuous warming was conducted using modified rhizotron
technique during three growing seasons in 2007–2009. Our results show that
day, night and continuous warming had different effects on longevity of
roots born in spring, summer and autumn, and that day warming significantly
prolonged overall lifespan for the roots born in the three growing seasons,
while night warning had no effect on overall lifespan. Day and night warming
had different effects on root non-structural carbohydrate content,
suggesting that allocation of photoassimilate may account for the
differential responses of root lifespan to day and night warming. These
results differ from other processes associated with ecosystems C cycle
such as total ecosystem productivity, net ecosystem productivity and soil
respiration. Our findings highlight that it is essential to incorporate the
differential effects of day and night warming on root dynamics into
simulating and predicting the responses and feedbacks of terrestrial
ecosystems C cycling to global warming.
| Reference Key |
bai2012biogeosciencesday
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|---|---|
| Authors | ;W. M. Bai;J. Y. Xia;S. Q. Wan;W. H. Zhang;L. H. Li |
| Journal | tetrahedron letters |
| Year | 2012 |
| DOI |
10.5194/bg-9-375-2012
|
| URL | |
| Keywords |
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