| Photosynthesis is the basis of growth and development of plants, which provides the basic organic substances and energy for all life activities, and is very sensitive to the variation of environment. F-C & R-S-C plastic greenhouse was a newly kind of planting establishment of fruit trees, which was applied extensively as a protective greenhouse of grapevine cultivation in South area of Yangtse River. As a result of short development history, physiological research on fruit trees which cultivated in this kind of plastic greenhouse .especially photosynthesis, were few, most of supervisors depend on their limited experience to manage production So, it's important to study the mechanisms that how F-C & R-S-C cultivation effects grapevine photosynthesis. In this paper, photosynthetic properties, diurnal variation of photosynthesis, photosynthetic efficiency, leaf response curves to PFD and CO2, leaf qualities and photosynthetic pigments content were studied on grapevine varieties cultivated inside and outside this kind of greenhouse. We also studied the change rules of main environmental factors. The results showed:1. Variation Rule of Main Environmental Factors in F-C & R-S-C Plastic Greenhouse(1)There existed higher Ts(consist of each depth of soil temperature ,such as Ocm,5cm, 10cm, 15cm and 20cm) inside greenhouse, which trend were more remarkable during sunny day and F-C phrase; Rules of diurnal variation varied at different depth of soil or at different weather conditions; Ts of each depth of soil was increased fluctuantly during the experiment minute; The Ts of each depth of soil inside greenhouse was obviously correlated to that outside greenhouse; (2)The value Ta inside and outside greenhouse reached Min. before sun rise(at about 6 o'clock), and reached Max. at about 14:00 o'clock, whereafter decreased; Mean of Ta, mean of Max. Ta, and mean of Min. Ta inside greenhouse were remarkably correlated those outside greenhouse; (3)RH remained higher during the night(above 90%);It reached the Min. at the time which Ta reached the Max.; (4)The PFD were weakened by greenhouse, but no influence were found on Ca.2. Comparison of Photosynthetic Characteristics in Leaves of 7 grapevine Varieties Cultivated in F-C & R-S-C Plastic Greenhouse(1)Diumal variation of Pn of 7 hothouse varieties had remarkable differences. Double-apex curves of Pn diurnal variation of 7 varieties were showed at F-C phrase(May.). During the R-S-C phrase(Aug.), the diurnal curves of Pn of 'Zhengzhouzaoyu', 'Guifeimeigui' and 'Sentianniwuhe' varieties were single-apex curves, while 'Lizhamate', '8611', '8612' and 'Limingwuhe' varieties were double-apex curves;(2)As a whole, there were higher value of leaf Pn, diurnalintegral of Pn, Tr, WUE, LSP, CSP and lower value of leaf Gs, AQY, CE, LCP, CCP during the F-C phrase than those during the R-S-C phrase;d)The value of leaf Pn, LSP, LCP of 7 hothouse varieties were 5.74 4.33~7.87 5.85C02umol-m'2-s'', 494~1110 mol-m"2-s~1, 9.6~51.5umol-m'2-s-1 respectively during the F-C phrase, and 3.85 1.82 ~ 5.62 3.23umol-rnV, 806 ~ 1407 mol-m-2s-1, 16.5 ~ 33.5umol-m'V respectively during the R-S-C phrase; The value of leaf CSP, CCP of 7 hothouse varieties were 717~1500uL-L~1, 60.6~88.0uL-L'' respectively during the F-C phrase, and 944~1601uL-L*1,14.1~59.1uL-L"1 respectively during the R-S-C phrase;(DComparison of photosynthetic parameters before-mentioned, it showed that 'Limingwuhe', 'Lizhamate' and 'Zhengzhouzaoyu' varieties had higher value of leaf Pn, diurnal integral of Pn, WUE, AQY, CE, LSP, CSP and lower value of leaf LCP, CCP that those of other varieties, thereby more adapted to this kind of greenhouse.3. Effect of R-S-C Cultivation on Diurnal Variation of Photosynthesis in Leaves of Grapevine at Different Weather Conditions(1)The value of Pn,WUE,Gs,Tr,Ci and Ls were changed regularly during the day; (2)Diurnal variation of Pn of Manicure Finger grown inside and outside greenhouse appeared to be a marked double-peak curve in the sunny day and a one-peak curve in the overcast day. Diurnal variat... |
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