| 天然白桦种苗光合作用日进程 |
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| 引用本文： | 王爱民,刘志学,祖元刚.天然白桦种苗光合作用日进程[J].上海大学学报(英文版),2000(Z1). |
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| 作者姓名： | 王爱民 刘志学 祖元刚 |
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| 作者单位： | 上海大学生命科学学院!上海200436(王爱民,刘志学),东北林业大学植物开放实验室!哈尔滨150040(祖元刚) |
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| 摘 要： | 本研究采用最先进的光合作用测定系统ＬＩ－６４００测定多功能树种白桦种苗的光合作用．天然白桦种苗光合速率日进程表现为单峰曲线,在下午１４： ００时达到最高峰（１０．５３μｍｏｌＣＯ２ｍ－２ｓ－１）,．其光合作用不存在“午休现象”．在１４：００时,白桦的气孔限制值（０.３１７２）和水分饱和亏缺（２．４６ｋＰａ）分别达到最大值,此时其水分利用效率较高,在中午１２：００时水分利用率达到最大值（２．９７ ｕｍｏｌＣＯ２ｍ－２ｓ－１ｍｍＨ２Ｏｍ－２ｓ－１）．在早上８：００,白桦获得一天中最大的表观量子效率;其蒸腾速率在下午１４： ００时最大（４．８２ｍｍＨ２Ｏｍ－２ｓ－１）．在光合速率的日进程中,白桦高光合速率值持续至少 ４个小时．这使得白桦的光合作用量得以有效累积,进而为其生长创造了有利条件．
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| 关 键 词： | 白桦种苗 光合作用 水分平衡 日进程 |
Daily Course of Photosynthesis in Seedlings of Natural Birch |
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| WANG Ai-min,LIU Zhi-xue,ZU Yuan-gang School of Life Sciences,Shanghai University,Shanghai ,China, Open Plant Laboratory,Northeast Forestry University,Harbin ,China.Daily Course of Photosynthesis in Seedlings of Natural Birch[J].Journal of Shanghai University(English Edition),2000(Z1). |
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| Authors: | WANG Ai-min LIU Zhi-xue ZU Yuan-gang School of Life Sciences Shanghai University Shanghai China Open Plant Laboratory Northeast Forestry University Harbin China |
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| Institution: | WANG Ai-min,LIU Zhi-xue,ZU Yuan-gang School of Life Sciences,Shanghai University,Shanghai 200436,China, Open Plant Laboratory,Northeast Forestry University,Harbin 150040,China |
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| Abstract: | In this research, the most advanced system for photosynthesis-LI 6400 was used in seedlings of natural birch which is one kind of multi-function species. The diurnal course of photosynthetic rate of birch shows a single peak (10.53 u molCO2 m-2s-1) Which reaches at 14 o'clock. There exist no "midday depression" in the photosynthesis. At 14 o'clock, while the value of stoma limitation (0.3172) and water pressure deficits of leaf (2.46 kPa) reach their peaks, the water utilization efficiency is still high and the highest value (2.97 u molCO2 m-2 s-1 nun H2O m-2s-1) appears at 12 o'clock. And the most value of apparent quantum yield occurs at 8 o'clock. But the climax value of transpiration rate appears at 14 o'clock (4.82 mmH2O m-2s-1). In the diurnal variation of photosynthetic rate, high value keeps on during at least 4 hours. This increase the amount of photosynthesis in daily course, furthermore, it makes advantage to the growth of birch. |
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| Keywords: | birch seedlings photosynthesis water balance diurnal course |
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