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Photosynthetic and Respiratory Accl.mation to Experimental.Warming for Four SpeCies in a Tal.grass Prairie Ecosystem

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Journal.of Integrative Pl.nt Biol.gy 2007年第3期49卷 270-281页

作者： xuhui zhou xiaozhong liu linda l. wallace yiqi luo Department of Botany and Microbiol.gy University of Oklahoma Norman Oklahoma 73019 USA

Gl.bal.temperature has been Increased by 0.6 ℃ over the past century and is predicted to Increase by 1.4-5.8 ℃ by the end of this century. It is uncl.ar what impacts gl.bal.warming wil. have on tal.grass species. In the present study, we examined l.af net photosynthetic rate （P.） and l.af respiration rate in darkness （Rd） of Aster erl.ol.es （l.） Nesom, Ambrosia psl.ostachya DC., Hel.anthus mol.is l.m., and Sorghastrum nutans （l.） Nash In response to experimental.warming in a tal.grass prairie ecosystem of the Great Pl.ins, USA, in the autumn （fal.） of 2000 and through 2001. Warming has been Impl.mented with infrared heaters since 21 November 1999. The P. increased significantl. In spring, decreased in earl. fal., and did not change in summer and l.te fal. in the four species under warming compared with control. The Rd of the four species increased significantl. until.mid-summer and then did not change under warming. Measured temperature-response curves of P. showed that warming Increased the optimum temperature of P. （Topt） by 2.32 and 4.59 ℃ for H. mol.is and S. nutans, respectivel., in August, whereas there were no changes in May and September, and A. ericol.es and A. psl.ostachya al.o showed no changes in any of the 3 months. However, P. at optimum temperature （Popt） showed downregul.tion in September and no regul.tion in May and August for al. four species. The temperature-response curves of Rd Il.ustrate that the temperature sensitivity of Rd, Q10, was l.wer in the warmed pl.ts compared with the control.pl.ts, except for A. ericoides in August, whereas there were no changes In May and September for al. four species. The resul.s of the present study indicate that photosynthetic and respiratory accl.mation varies with species and among seasons, occurring In the mid-growing season and not in the earl. and l.te growing seasons.

关键词： accl.mation Ambrosia psil.stachya cl.matic warming photosynthesis respiration Sorghastrum nutans tal.grass prairie temperature

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