CAJ | 학술논문

采用开顶式生长室(OTC)模拟增温对植被影响的研究方法,研究了青藏高原东缘林线交错带糙皮桦(Betula utilis)光合特性对模拟增温的响应.结果表明:与对照样地相比,OTC内日平均气温(1.2m)在植物生长季中增加2.9℃,5cm土壤温度增加0.4%.增温使糙皮桦幼苗叶片的净光合速率(P_n)、蒸腾速率(T_r)孔导度(G_s)分别增加17.4%、21.4%和33.9%,但对糙皮桦幼苗叶片的水分利用率(WUE)却没有明显影响,而对糙皮桦的叶氮浓度却表现为显著的负效应.同时,增温能显著增加糙皮桦幼苗的最大同化速率(P_(nmax))(+19.6%)、暗呼吸速率(R_d)(+14.3%)、表观量子效率(AQY)(+7.9%),但对其光补偿点(LCP)和光饱和点(LSP)却没有明显的影响.此外,增温使糙皮桦幼苗叶片的最大羧化速率(V_(cmax))和电子传递速率(J)分别增加了12.3%和11.7%,而磷酸丙糖利用率(TPU)和CO_2补偿点(CCP)对增温却并不敏感.该研究表明,模拟增温对林线糙皮桦光合生理总体上表现为正效应,这有可能帮助该物种对未来气候变化更快更好地适应.
채용개정식생장실(OTC)모의증온대식피영향적연구방법,연구료청장고원동연림선교착대조피화(Betula utilis)광합특성대모의증온적향응.결과표명:여대조양지상비,OTC내일평균기온(1.2m)재식물생장계중증가2.9℃,5cm토양온도증가0.4%.증온사조피화유묘협편적정광합속솔(P_n)、증등속솔(T_r)공도도(G_s)분별증가17.4%、21.4%화33.9%,단대조피화유묘협편적수분이용솔(WUE)각몰유명현영향,이대조피화적협담농도각표현위현저적부효응.동시,증온능현저증가조피화유묘적최대동화속솔(P_(nmax))(+19.6%)、암호흡속솔(R_d)(+14.3%)、표관양자효솔(AQY)(+7.9%),단대기광보상점(LCP)화광포화점(LSP)각몰유명현적영향.차외,증온사조피화유묘협편적최대최화속솔(V_(cmax))화전자전체속솔(J)분별증가료12.3%화11.7%,이린산병당이용솔(TPU)화CO_2보상점(CCP)대증온각병불민감.해연구표명,모의증온대림선조피화광합생리총체상표현위정효응,저유가능방조해물충대미래기후변화경쾌경호지괄응.
Aims Betula utilis is an important plant in the timberline ecotone of subalpine regions, Western Sichuan China. Our objective is to determine how this species changes its photosynthetic parameters under warming conditions. Methods We studied the responses of gas exchange to simulated global warming using the open-top chamber (OTC) method. During the 2007 growing season, microclimate data between the OTC and the control (CK) were taken at 15-min intervals with an automatic recording system. In mid-August, the gas exchange of B. utilis seed-lings in the OTC and the CK was measured with the LI-6400 Portable Photosynthesis System and a 6-cm~2 leaf chamber. Comparisons between the OTCs and the control plots were analyzed by the Wilcoxon's signed ranks test.Important findings Warming significantly increased instantaneous leaf net photosynthetic rate (Pn), conduc-tance (Gs) and transpiration (Tr) by 17.4%, 21.4% and 33.9%, respectively, and reduced leaf N concentration by 12.4%. Wanning also enhanced the maximum net photosynthetic rate (P_(nmax)) (+19.6%), dark respiration rate (Rd) (+14.3%) and apparent quantum yield (AQY) (+7.9%), but did not influence the light compensation point (LCP) or the light saturation point (LSP) of B. utilis seedlings. Moreover, warming markedly increased the maximum rate of RuBP carboxylation (V_(cmax)) and rate of photosynthetic election transport (J), but there were no clear differences between treatments for triose phosphate use (TPU) and compensation CO_2 (CCP). Our results indicated that in situ experimental wanning had positive effects on the gas exchange of B. utilis seedlings. These responses could be helpful for the timberline species to adapt to future global warming.