东北林业大学学报
東北林業大學學報
동북임업대학학보
JOURNAL OF NORTHEAST FORESTRY UNIVERSITY
2015年
6期
57-63
,共7页
李璟%叶充%蔡仕珍%廖源林
李璟%葉充%蔡仕珍%廖源林
리경%협충%채사진%료원림
遮光%玉竹%光合日变化%Par-Pn 响应曲线
遮光%玉竹%光閤日變化%Par-Pn 響應麯線
차광%옥죽%광합일변화%Par-Pn 향응곡선
Shading%Polygonatum odoratum%The photosynthesis diurnal variation curve%Par-Pn response curve
用Li－6400光合系统测定了遮阳率40％、70％、85％和98％4种遮光处理下玉竹的光合日变化曲线和光合有效辐射（ Par ）—净光合速率（ Pn ）响应曲线。结果表明，4种遮光处理下玉竹的Pn日变化均呈“双峰型”曲线，具有明显的“午休”现象，该现象主要是气孔限制造成的。全天的Pn值以遮阳率70％下最大，遮阳率98％下最小。4种遮光处理下玉竹的Pari－Pn 响应曲线呈快速上升—平缓变化—下降趋势。曲线在Par为600μmol· m－2· s－1以下的净光合速率以遮阳率70％最高，40％次之，98％最低；而Par为600μmol· m－2· s－1以上的净光合速率则以遮阳率40％最高，70％次之，98％最低。从光补偿点、光饱和点、暗呼吸速率、量子效率、最大光合能力来看，遮阳率70％的玉竹光补偿点最低，量子效率最高，暗呼吸速率较低，具有较高的净光合积累能力；遮阳率40％的玉竹光饱和点最高，最大光合能力最高，但光补偿点较高，暗呼吸速率最大，量子效率较低；遮阳率98％的玉竹光补偿点最高，光饱和点最低，量子效率和最大光合能力最低。综上认为玉竹栽培中以遮阳率70％较适宜，遮阳率98％的强遮光也对其生长不利。
用Li－6400光閤繫統測定瞭遮暘率40％、70％、85％和98％4種遮光處理下玉竹的光閤日變化麯線和光閤有效輻射（ Par ）—淨光閤速率（ Pn ）響應麯線。結果錶明，4種遮光處理下玉竹的Pn日變化均呈“雙峰型”麯線，具有明顯的“午休”現象，該現象主要是氣孔限製造成的。全天的Pn值以遮暘率70％下最大，遮暘率98％下最小。4種遮光處理下玉竹的Pari－Pn 響應麯線呈快速上升—平緩變化—下降趨勢。麯線在Par為600μmol· m－2· s－1以下的淨光閤速率以遮暘率70％最高，40％次之，98％最低；而Par為600μmol· m－2· s－1以上的淨光閤速率則以遮暘率40％最高，70％次之，98％最低。從光補償點、光飽和點、暗呼吸速率、量子效率、最大光閤能力來看，遮暘率70％的玉竹光補償點最低，量子效率最高，暗呼吸速率較低，具有較高的淨光閤積纍能力；遮暘率40％的玉竹光飽和點最高，最大光閤能力最高，但光補償點較高，暗呼吸速率最大，量子效率較低；遮暘率98％的玉竹光補償點最高，光飽和點最低，量子效率和最大光閤能力最低。綜上認為玉竹栽培中以遮暘率70％較適宜，遮暘率98％的彊遮光也對其生長不利。
용Li－6400광합계통측정료차양솔40％、70％、85％화98％4충차광처리하옥죽적광합일변화곡선화광합유효복사（ Par ）—정광합속솔（ Pn ）향응곡선。결과표명，4충차광처리하옥죽적Pn일변화균정“쌍봉형”곡선，구유명현적“오휴”현상，해현상주요시기공한제조성적。전천적Pn치이차양솔70％하최대，차양솔98％하최소。4충차광처리하옥죽적Pari－Pn 향응곡선정쾌속상승—평완변화—하강추세。곡선재Par위600μmol· m－2· s－1이하적정광합속솔이차양솔70％최고，40％차지，98％최저；이Par위600μmol· m－2· s－1이상적정광합속솔칙이차양솔40％최고，70％차지，98％최저。종광보상점、광포화점、암호흡속솔、양자효솔、최대광합능력래간，차양솔70％적옥죽광보상점최저，양자효솔최고，암호흡속솔교저，구유교고적정광합적루능력；차양솔40％적옥죽광포화점최고，최대광합능력최고，단광보상점교고，암호흡속솔최대，양자효솔교저；차양솔98％적옥죽광보상점최고，광포화점최저，양자효솔화최대광합능력최저。종상인위옥죽재배중이차양솔70％교괄의，차양솔98％적강차광야대기생장불리。
Using Li-6400 photosynthesis system , we measured the photosynthesis diurnal variation curves and photosynthetic ac -tive radiation (Par)-net photosynthetic rate (Pn) response curves of Polygonatum odoratum in four shading treatments with shading rate 40%, 70%, 85%and 98%.The Pn diurnal variation curves of Polygonatum odoratum showed two peaks , and we observed obvious midday depression of photosynthesis , which was mainly affected by stomatal limitation factors .The Pn maximum all day was shading rate 70%and the minimum was shading rate 98%.The Par-Pn response curve of Polygona-tum odoratum with four shading treatment was rapidly rising-smooth change-decline.The curves showed that when Par was lower than 600μmol· m-2· s-1, Pn in shading rate of 70%was highest, followed by 40%, the minimum was shading rate of 98%, while Par was higher than 600μmol· m-2· s-1, Pn in shading rate of 40%was highest, followed by 70%, and the minimum was 98%.The light compensation point , light saturation point , the dark respiration rate , quantum efficiency , photosynthetic capacity showed that Polygonatum odoratum in shading rate of 70%had higher photosynthetic accumulation ability with the minimum light compensation point , the maximum quantum efficiency and lower dark respiration rate , while it in shading rate of 40%had the highest light saturation point , the maximum photosynthetic capacity , and higher light compensation point , the highest dark respiration rate , lower quantum efficiency .Polygonatum odoratum in shading rate of 98%had the highest light compensation point and the minimum light saturation point , quantum efficiency and photosyn-thetic capacity.Therefore, Polygonatum odoratum cultivation in the shading rate of 70%was more appropriate, and the shading stress of shading rate of 98%was its negative growth .
