论文部分内容阅读
以生长在沈阳市区内的银杏为试材,使用开顶箱模拟法对倍增CO2质量浓度(700μmol．mol-1)和正常空气CO2质量浓度(≈350μmol．mol-1)条件下,银杏生长参数、叶面积指数、不同天气中净光合速率日变化进行了初步研究,探讨了高质量浓度CO2对单株银杏光合固碳能力的影响。结果表明:CO2质量浓度增高可以显著提高银杏枝条的生长量和银杏的叶面积指数。经高质量浓度CO2处理后,银杏不同天气下光合速率日变化趋势与对照一致,即晴天为双峰曲线,多云天气为单峰曲线,但净光合速率显著高于对照(P<0．001)。由于净光合速率和叶面积指数升高,高质量浓度CO2也显著提高了单株银杏的固碳释氧能力(P<0．01),晴天比对照提高了119．5％,阴天提高了175．4％。
Taking ginkgo growing in the urban area of Shenyang as the test material, the open roof simulation was used to evaluate the growth of Ginkgo biloba under doubled CO2 concentration (700μmol.mol-1) and normal air CO2 concentration (≈350μmol.mol-1) Parameters, leaf area index and diurnal variation of net photosynthetic rate in different weather were studied. The effects of high concentration of CO2 on photosynthetic carbon fixation of single ginkgo were discussed. The results showed that the increase of CO2 concentration could significantly increase the growth of ginkgo shoots and the leaf area index of ginkgo. The diurnal variation of photosynthetic rate of Ginkgo biloba under different weather conditions was consistent with that of the control, ie, the bimodal curve in sunny days and the unimodal curve in cloudy days, but the net photosynthetic rate was significantly higher than that of the control (P <0.001) . Due to the increase of net photosynthetic rate and leaf area index, high concentration of CO2 also significantly increased the carbon fixation and release of oxygen per plant (P <0.01), increased by 119.5% in sunny days and increased in cloudy days 175.4%.