Study on the photosynthetic dynamic variation of 4 dwarf bamboos
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Bamboo is one of the important forest resources in China and it can take ecological,economical and social benefits.The photosynthetic dynamic variation of 4 dwarf bamboos(Arundinaria argenteostriata,Arundinaria fortunei,Shibataea chinensis,Sasaella masamuneana f.aureostriata) was researched.The results showed that the diurnal variation of net photosynthetic rate was bimodality in April and August,The chief reason for photosynthetic midday depression in these months was that the stoma partly shut.It was the different time that the highest net photosynthetic of the four dwarf bamboos appeared.However,it was a single peak curve in November and the net photosynthetic rate of the August was bigger than that of the April and November.The photosynthetic parameters were simulated by rectangle hyperbola,non-rectangle hyperbola and binomial regression.The light saturation point approached the actual value when fitted with binomial regression,and the other parameters were more precise while fitted with non-rectangle hyperbola.Keywords:
Hyperbola
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The photosynthetic characteristics of needle leaf on annual branch of Larix gmelini was studied by LI-6400 photosynthetic system.The results indicate:(1) Diurnal variation of Pn on annual needle leaf of Dahurian larch present the trend of single-peak curve on June～September.The day average Pn was highest on 2th August while lowest on 13th June.(2) Diurnal variation of Tr on annual needle leaf of Dahurian larch also Present the trend of single-peak curve on June～September.The day average Tr present ascending trend,The day average Tr was highest on 1th September while lowest on 13th June.which provided scientific basis for photosynthetic of introduction and exploitation.
Larix gmelinii
Diurnal temperature variation
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Seasonal variations in photosynthesis of cassava cv. Rayong 9 (RY9) under irrigated and rain-fed conditions were evaluated at the age of three and six months after planting (MAP). Photosynthetic light-response (PN/I) curves revealed that cassava leaves attained the highest maximum net photosynthetic rates (PNmax) in the rainy season, followed by the hot one, while the lowest PNmax was found in the cool season. Photosynthetic potential of the 3-month-old plants was mostly higher than that of the 6-month-old plants, and the seasonal variation in photosynthetic capacity was also more apparent in the younger plants. PN/I curves were used to predict daily net photosynthetic rate (PN) for each season based on daily average solar radiation data. The predicted PN were considerably lower than the PNmax values. This indicated that solar radiation is a limiting factor for photosynthesis, particularly in the rainy season. The data provided basic information for breeding cassava genotypes with enhanced photosynthesis during the period of unfavorable environment. Furthermore, the data are potentially useful in modeling photosynthesis and crop growth as affected by environmental factors.
Wet season
Seasonality
Dry season
Photosynthetically active radiation
Photosynthetic capacity
Growing season
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In this paper the comparative research was carried out on photosynthetic and phisiological characteristics of 3 tree shapes of Korla Fragrant Pear with CB-1102 portable photosynthesis transpirometer.The result indicated that there is a significant difference of the net photosynthetic rate between the three tree shapes of Korla Fragrant Pear on a clear day,its value in both open-center shape and delayed-open central leader shape was a typical bimodal curve pattern,the peak value appeared in about 12:30 o'clock and 17:30 o'clock with photosynthetic Noon Break phenomenon at midday;The variation of transpiration rate presented positive correlation with the net photosynthetic rate,and the variation of transpiration rate,in the photosynthetic process,was mainly affected by the local atmosphere temperature;The stomatal conductance value of open-center shape was the highest;The intercellular CO2 concentration presented negative correlation with the net photosynthetic rate;For considering these parameters,the open-center shape and delayed-open central leader shape can improve the photosynthetic performance;Because the relatively light distribution presented positive correlation with crown corresponding level,the photosynthetic performance in the same tree shape and different canopies was the hightest.
Tree (set theory)
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In this paper,diurnal dynamics of photosynthesis physical-ecological characters,Pn-PAR and PnCiresponse curves were measured,and the relationship between Pnand main ecological factors was analyzed in three young sandy plants seedlings.The results showed that:(1)Diurnal dynamics curves of net photosynthetic rate(Pn)of Morus alba,Apocynum lancifolium and Atraphaxis bracteata appeared bimodalpeak,single-peakandcontinued to declinetypes,respectively.(2)Water utility efficiency(WUE)and light utility efficiency(QUE)of A.bracteata was higher than that of A.lancifoliumand M.alba's.M.alba has a strong ecological adaptation range for light intensity,the range of using light intensity of A.lancifoliumis relatively narrow,so photosynthetic potential is not high.The maximum net photosynthetic rate(Pmax)of A.bracteata was the highest,which suggested its photosynthetic capacity was higher also,A.lancifolium has the highest CO2 compensation point(CCP)and saturation point(CSP),at the same time,with smaller Pmax.(3)The atmospheric temperature(Ta)has greater direct and indirect impact on Pnof M.alba and A.lancifolium,and vapor pressure deficit(VPD)coupling Tahad larger indirect effects on Pnof A.bracteataand A.lancifolium.To sum up,in terms of photosynthetic physiological adaptability.As preventing and desertification controling plant material,A.bracteata can be planted in the sandy slope with fulllight,M.albain the transition zone of oasis and desert afforestation,and A.lancifoliumin the sandy slope with weak light condition.
Compensation point
Water Use Efficiency
Light intensity
Photosynthetic efficiency
Photosynthetic capacity
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Respiration rate
Dry weight
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Photosynthetic characteristics and main impact factors were measured in different seasons,and the data were analyzed by correlation and path coefficients,and different irradiances were measured in Hua’an County,Fujian Province,in order to study Guadua amplexifolia’s photosynthesis characteristic,CO2 assimilation rate on different times in one day. The results indicated that light saturation point (LSP),light compensation point (LCP),dark respiration rates(Rd),and net photosynthesis at saturation light (Pnmax) all reached highest in July,lower in April and October,the lowest in January. In all seasons but April,daily course of net photosynthesis rate (Pn) had midday-depression pattern. The daily mean value of Pn was in the sequence AprilJulyOctoberJanuary. All environmental and physiological factors except for relative humidity (RH) had significant correlation with Pn,such as Tr,Ci,Gs,VPD,PAR,Tleaf and so on. The main environmental factors differed in every season. In January,leaf temperature (Tleaf) was the most important factor to Pn. But the effect of RH increased obviously in October. The effect of tested environmental factor to Pn was in the sequence VPDPARRHTleaf in the whole growth period.
Compensation point
Seasonality
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In order to understand the photosynthetic characteristics of dominant species in Yintan wetland of Lanzhou section of Yellow River in summer,ten species were selected,including Lythrum salicaria,Phragmites communis,Polygonum lapathifolium,Echinochloa crusgalli,Solanum nigrum, Amaranthus retroflexus, Datura stramonium, Onobrychis viciaefolia, Scirpus triqueter,and Juncellus serotinus. Then,the diurnal variations of photosynthetically active radiation( PAR),net photosynthetic rate( Pn),transpiration rate( Tr),stomatal conductance( Gs),intercellular CO2concentration( Ci) of the mature leaves of each plant,and the atmospheric temperature( Ta) and atmospheric CO2concentration( Ca) were measured by employing the CI-340 portable photosynthetic system. The curves of diurnal variation of Pnin leaves of seven plants showed two peaks,suggesting a remarkable photosynthetic midday depression,which was caused by stomatal limitation and non-stomatal limitation. Correlation analysis and stepwise regression analysis showed that there was good correlation between Pnand Tr,Gs,PAR in most plants,and each factor had different coefficients of contribution to Pn,indicating that the main physiological and ecological factors influencing the photosynthetic rate were different among species. Moreover,strong light and high temperature at noon intensified the transpiration rate of wetland plants. Our study provides information on understanding the relationship between photosynthetic characteristics and environmental factors of the dominant species,and on species selection of planting wetland plants.
Photosynthetically active radiation
Phragmites
Stomatal Conductance
Polygonum
Juncus
Eleusine indica
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AbstrcatUnder the proper condition of sunny days, LI-6400 Portable Photosyntyesis System is used to study the characteristics and the diurnal changes of fast growing species of Eucalyptus dunnii Maid and Cinnamomum camphora in the natural conditions such as photosynthetic rate (P_n), transpiration rate (T_r), stomatal conductance (Cond), CO_2 concentration between the cells. Meanwhile, it is compared with the slowly growing tree Magnolia grandiflora. The results show that: (1) The diurnal changes curves of photosynthetic rate of Eucalyptus dunnii Maid, Cinnamomum camphora, Magnolia grandiflora are all taken on a double peak curve, and all has noon break. The former two are higher than the last one. (2) The diurnal changes curves of transpiration rate of all the three species are similar, and similar to their photosynthetic rate curves, and are all taken on a double peak curve. The former is higher than the last two. (3) The stomata conductance of the three species is positively correlated with the photosynthetic rate, and it is largely decided by the transpiration rate. (4) CO_2 concentration between the cells of three species is affected by the CO_2 concentration in the air and stomatal conductance. (5) The vapor pressure deficit is attributed to the photosynthesis active radiation and the leaf temperature.
Cinnamomum camphora
Stomatal Conductance
Noon
Diurnal temperature variation
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The dynamic variation of transpiration and evaporation rates of 4 dwarf bamboos(Arundinaria argenteostriata,Arundinaria fortune,Shibataea chinensis,Sasaella masamuneana f.aureostriata) were measured.The results showed that the diurnal variation of transpiration rate was a double peak curve in April and August,stoma partly closed was the chief reason,however the peak time of transpiration rate of different bamboo species reach the was different.A single peak curve appeared in November and the transpiration rate of August was the highest among the tested 3 months.The correlation analysis indicated that the evaporation rate of culm and leaves significant positively correlated with temperature and illumination,and significant negatively correlated with humidity.
Stoma (medicine)
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The photosynthetic diurnal variations in leaves of Rhododendron fortunei seedling under natural conditions had been studied. The results were as follows: 1) In clear summer days, the diurnal variations of net photosynthetic rates (Pn) of Rhododendron fortunei were double-peaked curves. The diurnal variations of internal CO2 concentration (Ci) were just opposite to Pn. The increasing of Ci at midday showed that the decreasing of Pn was related to non-stoma restriction factors. 2) By the method of stepwise multi-regression, the most excellent equation of the diurnal variation of Pn was attained as follows: Y=28.3043+0.0028X1-0.2821X2-0.8538 X4 +0.0414 X5. The analysis of partial correlation and path coefficient on Pn and factors showed that the diurnal variation of Pn had closer relations to the primary direct factors including photosynthetic active radiation (PAR) , air CO2 concentration (Ca) , ambient temperature (Ta) and leaf temperature (T1).
Diurnal temperature variation
Photosynthetically active radiation
Path coefficient
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