Combined effects of varying water content and CO2 concentration on photosynthesis in Spagnum fuscum
Combined effects of varying water content and CO2 concentration on photosynthesis in Spagnum fuscum
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不同含水量和CO2浓度对黑檀光合作用的综合影响
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
J. Silvola
中科院分区：
文献类型：
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作者：
J. Silvola
意大利面（Spagnum fuscum）的光合作用Klinggr。在不同的含水量和二氧化碳浓度下在实验室测量。在当前大气CO2浓度附近，光合作用的最佳含水量为600-800%（干重百分比）。水分含量越低，光合作用的下降幅度就越大，水分含量越高，光合作用的下降幅度就越小。随着CO2浓度的增加，最佳含水率范围越宽越高。在3000 ppm时，随着含水量的增加，光合作用不再减少。柽柳的含水量对光合作用对CO2浓度的响应有相当大的影响。在被水饱和的苔藓中，光合作用逐渐增加，直到二氧化碳含量达到8000ppm，但随着含水量的减少，这种饱和浓度会降低，在含水量为700% - 800%时为1500ppm。在含水量只有300 - 400%的干苔藓中，二氧化碳浓度增加超过300ppm对光合作用的促进作用微乎其微。
The photosynthesis of Spagnum fuscum (Schimp.) Klinggr. at different water contents and CO2 concentrations was measured in the laboratory. The optimal water content for photosynthesis near the current atmospheric CO2 concentration is 600–800% (percentage of dry weight). The decrease in photosynthesis is very steep towards lower water contents and less steep towards higher water contents. The optimal water content range moves higher and becomes wider with increasing CO2 concentration. At 3000 ppm there is no longer any decrease in photosynthesis with increasing water content. The water content of S. fuscum has a considerable effect on the response of photosynthesis to CO2 concentration. In a moss saturated with water, photosynthesis increases gradually until 8000 ppm CO2, but this saturation concentration becomes lower with decreasing water content, being c. 1500 ppm at a water content of 700–800%. An increase in CO2 concentration over 300 ppm will raise photosynthesis very little in dry moss with a water content of only 300–400%.