东北林业大学学报
東北林業大學學報
동북임업대학학보
JOURNAL OF NORTHEAST FORESTRY UNIVERSITY
2014年
9期
19-22
,共4页
樟树%指数改进模型%光合特性季节动态%最大净光合速率%光补偿点%光饱和点
樟樹%指數改進模型%光閤特性季節動態%最大淨光閤速率%光補償點%光飽和點
장수%지수개진모형%광합특성계절동태%최대정광합속솔%광보상점%광포화점
Cinnamonum campora%Modified exponential model%Seasonal photosynthetic dynamics%Maximum net photosynthetic rate%Light compensation point%Light saturation point
樟树( Cinnamonum campora)春、夏、秋季净光合速率日动态均呈现“双峰型”曲线,而冬季为“单峰型”曲线,其日最大净光合速率和日均值存在明显的季节变化,由大到小的排序均为夏季(9.06、7.03μmol· m-2· s-1)、秋季(7.23、5.96μmol· m-2· s-1)、春季(6.91、5.58μmol· m-2· s-1)、冬季(5.60、4.32μmol· m-2· s-1)。基于指数改进模型估算的樟树不同季节光合参数分析得出,樟树光补偿点、光饱和点、最大净光合速率、暗呼吸速率均呈现显著的季节变化,夏季樟树光补偿点(63.44μmol· m-2· s-1)最大,春、秋、冬季(均约为52.3μmol· m-2· s-1)没有显著差异;夏季的光饱和点(1625.70μmol· m-2· s-1)、最大净光合速率(9.19μmol· m-2· s-1)最大,春季(1519.39、6.80μmol· m-2· s-1)和秋季(1509.53、7.71μmol· m-2· s-1)两者没有显著差异,冬季最小(1267.31、5.31μmol· m-2· s-1);樟树夏季暗呼吸速率(2.53μmol· m-2· s-1)最大,春、秋、冬季(均约为1.4μmol· m-2· s-1)没有显著差异。可见,樟树为强阳性树种,一年四季均具有较好的净光合速率和生长潜力。
樟樹( Cinnamonum campora)春、夏、鞦季淨光閤速率日動態均呈現“雙峰型”麯線,而鼕季為“單峰型”麯線,其日最大淨光閤速率和日均值存在明顯的季節變化,由大到小的排序均為夏季(9.06、7.03μmol· m-2· s-1)、鞦季(7.23、5.96μmol· m-2· s-1)、春季(6.91、5.58μmol· m-2· s-1)、鼕季(5.60、4.32μmol· m-2· s-1)。基于指數改進模型估算的樟樹不同季節光閤參數分析得齣,樟樹光補償點、光飽和點、最大淨光閤速率、暗呼吸速率均呈現顯著的季節變化,夏季樟樹光補償點(63.44μmol· m-2· s-1)最大,春、鞦、鼕季(均約為52.3μmol· m-2· s-1)沒有顯著差異;夏季的光飽和點(1625.70μmol· m-2· s-1)、最大淨光閤速率(9.19μmol· m-2· s-1)最大,春季(1519.39、6.80μmol· m-2· s-1)和鞦季(1509.53、7.71μmol· m-2· s-1)兩者沒有顯著差異,鼕季最小(1267.31、5.31μmol· m-2· s-1);樟樹夏季暗呼吸速率(2.53μmol· m-2· s-1)最大,春、鞦、鼕季(均約為1.4μmol· m-2· s-1)沒有顯著差異。可見,樟樹為彊暘性樹種,一年四季均具有較好的淨光閤速率和生長潛力。
장수( Cinnamonum campora)춘、하、추계정광합속솔일동태균정현“쌍봉형”곡선,이동계위“단봉형”곡선,기일최대정광합속솔화일균치존재명현적계절변화,유대도소적배서균위하계(9.06、7.03μmol· m-2· s-1)、추계(7.23、5.96μmol· m-2· s-1)、춘계(6.91、5.58μmol· m-2· s-1)、동계(5.60、4.32μmol· m-2· s-1)。기우지수개진모형고산적장수불동계절광합삼수분석득출,장수광보상점、광포화점、최대정광합속솔、암호흡속솔균정현현저적계절변화,하계장수광보상점(63.44μmol· m-2· s-1)최대,춘、추、동계(균약위52.3μmol· m-2· s-1)몰유현저차이;하계적광포화점(1625.70μmol· m-2· s-1)、최대정광합속솔(9.19μmol· m-2· s-1)최대,춘계(1519.39、6.80μmol· m-2· s-1)화추계(1509.53、7.71μmol· m-2· s-1)량자몰유현저차이,동계최소(1267.31、5.31μmol· m-2· s-1);장수하계암호흡속솔(2.53μmol· m-2· s-1)최대,춘、추、동계(균약위1.4μmol· m-2· s-1)몰유현저차이。가견,장수위강양성수충,일년사계균구유교호적정광합속솔화생장잠력。
The daily net photosynthetic rates of Cinnamonum campora showed a double-peaked curve in spring, summer and au-tumn, and a single-peaked curve in winter.Seasonal dynamics obviously occurred in daily maximum net photosynthetic rates and daily average net photosynthetic rates, and their value orders in four seasons were 9.06μmol· m-2 · s-1 , 7.03μmol· m-2· s-1 in summer >6.91μmol· m-2· s-1, 5.58μmol· m-2· s-1 in spring≈7.23μmol· m-2· s-1, 5.96μmol· m-2 · s-1 in autumn>5.60μmol· m-2 · s-1 , 4.32μmol· m-2 · s-1 in winter.By analyzing the different seasons’ photosyn-thetic parameters estimated by modified exponential model, C.campora ’ s light saturation points, light compensation points, maximum net photosynthetic rates, and dark respiration rates had obvious seasonal variation.The light saturation point of C.campora in summer (63.44μmol· m-2· s-1) was largest, and about 52.3μmol· m-2· s-1 with no differences from the values in spring, summer and winter.The light saturation point ( 1625.70μmol · m-2 · s-1 ) and maximum net photosynthetic rate (9.19μmol· m-2· s-1) of C.campora in summer were largest, and the values in winter (1 267.31μmol· m-2· s-1, 5.31μmol· m-2· s-1) was least.However, their values in spring (1 519.39μmol· m-2· s-1, 6.80μmol· m-2· s-1) and autumn (1 509.53μmol· m-2· s-1, 7.71μmol· m-2· s-1) were not different significantly.Dark respiration rate of C.campora in summer (2.53μmol· m-2· s-1) was largest, and the values in spring, autumn and win-ter were not different significantly , nearly 1.4μmol· m-2 · s-1 .Therefore, C.campora was an intolerant tree species with good photosynthetic rate and growth potential all the year.