本文選題：長蕊木蘭 + 瑞麗山龍眼　； 參考：《昆明理工大學》2017年碩士論文

【摘要】：用Li-6400XT便攜式光合儀對高黎貢山南段三種生境(荒草地、大棚、林下)中生長的國家Ⅰ級保護植物長蕊木蘭幼苗,以及瀕危植物瑞麗山龍眼幼苗、瑞麗茜樹幼苗在春季、夏季、冬季晴朗天氣中進行連續(xù)的光合特性測定(包括凈光合速率值、氣孔導度值、蒸騰速率值、胞間CO2濃度值日變化,凈光合速率與環(huán)境因子相關性分析,凈光合速率—光響應,凈光合速率—CO2響應),旨在了解三種植物的光合特性,為其科學保護提供一定依據(jù)。結果顯示:(1)不同季節(jié)長蕊木蘭幼苗生長的各生境中的光合有效輻射值日變化曲線均為單峰型。各生境中幼苗在春季和冬季凈光合速率值、蒸騰速率值、氣孔導度值日變化未見“午休”現(xiàn)象,但夏季,上述值日變化均出現(xiàn)“午休”現(xiàn)象;任一季節(jié)胞間CO2濃度值與其他光合參數(shù)值日變化趨勢相反。在春季與冬季,各生境中幼苗的凈光合速率值變化受光合有效輻射值的影響最大,而夏季,受光合有效輻射值和空氣相對濕度值的影響一樣大�；牟莸嘏c林下幼苗的光飽和點值、光補償點值和CO2補償點值隨季節(jié)變化在降低,大棚幼苗值基本不變。(2)任一季節(jié)瑞麗山龍眼幼苗所在各生境中的光合有效輻射值日變化曲線均為單峰型。春季與夏季,三種生境下幼苗的凈光合速率值、氣孔導度值、蒸騰速率值日變化有“午休”現(xiàn)象,且夏季“午休”時間較長;冬季,各參數(shù)值日變化未見“午休”現(xiàn)象;任一季節(jié),胞間CO2濃度值的日變化趨勢與凈光合速率值變化趨勢是相反的。任一季節(jié),各生境下幼苗的凈光合速率值均受到光合有效輻射值的影響最大。任一季節(jié),各生境下幼苗的光響應與CO2響應曲線變化相似;各生境幼苗的光飽和點值均為冬季最高,而光補償點值在三個季節(jié)里基本不變。CO2補償點值是荒草地與林下幼苗在春季與冬季高于夏季,而大棚幼苗值三個季節(jié)基本相同。(3)任一季節(jié),瑞麗茜樹幼苗生長的各生境中光合有效輻射值日變化曲線均為單峰型。春季,荒草地與大棚幼苗的凈光合速率值、氣孔導度值、蒸騰速率值日變化有“午休”現(xiàn)象,林下幼苗則未見;夏季,各生境下幼苗的上述參數(shù)值日變化曲線在均有“午休”現(xiàn)象;冬季,均未見。任一季節(jié)各生境幼苗的凈光合速率值變化都受光合有效輻射值影響最大。春季,林下幼苗的光補償點值高于荒草地與大棚幼苗,荒草地與林下幼苗的光飽和點值和CO2補償點值均高于大棚幼苗;夏季與冬季,均是大棚幼苗的光補償點值最低,各生境幼苗光飽和點值相差不大,只是夏季荒草地幼苗的CO2補償點值最低;冬季,荒草地與大棚幼苗的CO2補償點值高于林下幼苗。
[Abstract]:The seedlings of Magnolia longan, an endangered plant, grown in three habitats (barren grassland, greenhouse, undergrowth) in the southern section of Gaoligong Mountain were studied by Li-6400XT portable photosynthetic instrument. The seedlings of Magnolia longan, an endangered plant, were grown in spring and summer. Continuous photosynthetic characteristics (including net photosynthetic rate value, stomatal conductance value, transpiration rate value, intercellular CO2 concentration diurnal variation, correlation analysis between net photosynthetic rate and environmental factors, net photosynthetic rate-light response) were carried out in sunny winter weather. Net photosynthetic rate (-CO _ 2) was used to understand the photosynthetic characteristics of three plants and to provide scientific basis for their protection. The results showed that the diurnal variation curves of photosynthetic effective radiation in different seasons of Magnolia lanceolata seedlings were single-peak. Net photosynthetic rate, transpiration rate and stomatal conductance of seedlings in spring and winter did not show "lunch break" phenomenon in different habitats, but in summer, "noon break" phenomenon appeared. The intercellular CO2 concentration in any season is opposite to that of other photosynthetic parameters. In spring and winter, the variation of net photosynthetic rate of seedlings in different habitats was the most affected by photosynthetic available radiation, but in summer, it was affected as much by the relative humidity of air. The value of light saturation point, light compensation point and CO2 compensation point decreased with seasons. The diurnal variation curve of photosynthetic effective radiation in different habitats of Longan seedlings of Ruili Mountain in any season is single peak type. In spring and summer, the diurnal variation of net photosynthetic rate, stomatal conductance and transpiration rate of seedlings in three habitats had the phenomenon of "lunch break", and the "noon break" time in summer was longer than that in winter. In any season, the diurnal variation trend of intercellular CO2 concentration is opposite to that of net photosynthetic rate. In any season, the net photosynthetic rate of seedlings under different habitats was the most affected by the photosynthetic effective radiation value. In any season, the light response of seedlings in each habitat is similar to that of CO2 response curve, and the light saturation point of seedlings in each habitat is the highest in winter. The value of light compensation point is almost unchanged in three seasons. The compensation point value of CO _ 2 is higher in spring and winter than in summer, but the value of greenhouse seedling is the same in three seasons. The diurnal variation curves of photosynthesis active radiation in different habitats of Seedling growth of Rhizoma Rehmanniae were all single peak type. In spring, the net photosynthetic rate, stomatal conductance and transpiration rate of the seedlings of barren grassland and greenhouse had the phenomenon of "midday depression", but the seedlings under the forest were not seen in summer, but in summer, the changes of photosynthesis rate, stomatal conductance and transpiration rate were not observed. The diurnal variation curve of the above parameters in different habitats had "midday break" phenomenon, but in winter, it was not seen. The variation of net photosynthetic rate of seedlings in any season was the most affected by photosynthetic effective radiation. In spring, the light compensation point value of undergrowth seedlings was higher than that of barren grassland and greenhouse seedlings, the value of light saturation point and CO2 compensation point of barren grassland and undergrowth seedlings were higher than those of greenhouse seedlings, and the light compensation points of greenhouse seedlings were the lowest in summer and winter. The light saturation point of the seedlings in different habitats was not different, but the CO2 compensation point of the seedlings in summer was the lowest, and in winter, the CO2 compensation point of the seedlings in the wasteland and the greenhouse was higher than that of the seedlings under the forest.
【學位授予單位】：昆明理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：Q948

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