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It contains quadratic photosynthetic chamber and columned soil fixing body, wherein soil fixing body of canopy leaf chamber bottom set with knob basal portion being corrugation notch, capable of easy inserting amboceptor in soil to form inclosed canopy leaf chamber, amboceptor upper port inosculation with photosynthetic chamber lower wall round opening to make canopy leaf chamber intracavity forming one integral, photosynthetic chamber upper wall sealed by two side glue and photosynthetic film to ensure photosynthetic chamber steady light permeability, photosynthetic chamber sidewall installed one small size fan controlled by external battery and switch, fan capable of rapid making canopy leaf chamber gaseous reaching equalization.

本发明涉及一种用于测定植物冠层群体光合作用的冠层叶室,由正方形的光合室和圆柱状的土壤固定体两部分结合而成,冠层叶室下部土壤固定体设有把手,基部为波纹状切口,可以很容易地把固定体插入土壤中形成密闭的冠层叶室,固定体上口与光合室底壁的圆形开口吻合,使冠层叶室的内腔形成一个整体;光合室顶壁用双面胶和光合薄膜密封,以保证光合室稳定的透光性能;光合室侧壁内安装一个小型风扇,由装在侧壁外的电池和开关控制,风扇可使冠层叶室内的气体迅速达到平衡。

Results showed that the diurnal changes in Pn of the species in different periods were similar and could be expressed as two-hump curves, reflecting a significant middy depression. The decrease in Pn during midday was mainly resulted from non-stomatal limitation in July, but stomatal limitation occurred in August and September. High temperature and low relative humidity were critical factors constraining Pn in July.

结果表明,不同时期防风净光合速率日变化均呈双峰型曲线,具有明显的光合"午休"现象。7月份防风光合速率中午降低主要由非气孔限制引起,8月份、9月份防风光合速率中午降低则主要由气孔限制引起,7月份高温低湿是限制防风Pn的主要环境因子。

The results showed that the diurnal changes of photosynthesis of S. chinensis in tile overstory took on "double-peak" curve with remarkable midday depression. The midday depression was mainly due to non-stomata1 limitations. On the contrary, the diurnal changes of photosynthesis of S. chinensis in the understory took on "one-peak" curve with low Pn. The maximal Pn was only half of that of S. chinensis in the overstory. The correlation analysis showed that the limiting factor for this low Pn might be light intensity (p=0.001). Compared with its accompanying plants, S. chinensis was in a disadvantaged status in the community with low photosynthetic capacity, water use efficiency, and the ratio of photosynthetic rate to respiration rate.

结果表明:夏蜡梅冠层的光合速率日进程呈"双峰"曲线,有明显的"午休"现象,经分析其"午休"的原因主要是由非气孔因素引起的;林下夏蜡梅则表现为"单峰"曲线,净光合速率较低,最大净光合速率不及冠层的1/2,相关分析结果表明其最重要的影响因子是光合有效辐射(p=0.001);与其它伴生植物相比,夏蜡梅的日均光合速率、最大光合速率、水分利用效率和光合速率/呼吸速率都明显偏低,在群落竞争中处于不利地位。

Diurnal changes of Pn and environmental factors (photosynthetic available radiation and air temperature and relative humidity) and physiology factors (stomatal conductance and transpiration rate and intercellular CO2) in leaves of puna chicory were measured using CI-340 portable photosynthesis system.

利用CI-340便携式光合仪,测定了普那菊苣叶片净光合速率和环境因子(气温、光合有效辐射、空气相对湿度)、生理因子(蒸腾速率、胞间CO2浓度、气孔导度)的日变化;通过回归和通径分析,考察了影响因子对净光合速率日变化的影响。

The study of the photosynthetic and growth indices versus stress intensities shows that Caryopteris mongholica Bunge strengthens its adaptation to water stress with the reduction of net photosynthetic rate, transpiration rate and Maximum quantum efficiency of PSⅡphotochemistry, and the weakening of biomass accumulation and growth rate that are accompanied with a better water use efficiency and an increased Root/Shoot Ratio, and that the provenance of Inner Mongolia TUZUOQI is of the best physiological indices in water deficit.

通过测定不同水分梯度、不同种源的光合生理与生长指标表明:蒙古莸通过降低光合效率、蒸腾速率和最大光化学效率,减缓生长和生物量积累,提高水分利用效率和根冠比来适应水分胁迫。在水分胁迫下,蒙古莸光合能力的下降是引起其生长减缓的重要原因。从蒙古莸光合能力与生长综合考虑,内蒙古土默特左旗种源是在水分胁迫下表现最优良的种源。

Results showed diural variations of leaf Pn displayed bipeaked curve model, indicating the depression of photosynthesis at noon. Leaf Pn rate in June was higher than in September; Compared to leaf Pn, Cs had a similar changing curve, Cs in June was higher than in September. While diural variations of intercellular CO2 concentration were opposite to that of leaf Pn and Cs, decreased before 1200,increased after 1200, decreased again at 1600,after 1600 increased again; diural variations of climatic factors displayed single peaked curve model, peakedvalue occurred at 1400,and their influences on physiological factors were indirected and integrated.

结果表明,光合速率的日变化具有双峰型,存在光合午休现象,6月的光合速率高于9月;沙棘的气孔导度较低,其日变化与光合速率有相似的变化趋势,6月的气孔导度大于9月;细胞间CO2浓度的日变化与光合速率和气孔导度的日变化相反,1200之前下降,之后上升,1600下降,然后上升;气象因子的日变化具有单峰型,峰值1400出现,对生理因子的影响是间接且综合的。

The one-way flow of electrons through photosystems II and I is called noncyclic photophosphorylation; plants also derive additional ATP through cyclic photophosphorylation

通过光合系统Ⅱ流经光合系统Ⅰ的电子路径称非循环式光合磷酸化;植物通过循环式光合磷酸化获得额外的ATP,一些电子在光合系统Ⅰ和Ⅱ之间的电子传递链中回流。

The results showed that, the diurnal changes of Pn of leaves in eggplant showed a double peak curve (there was a significant "midday depression" at noon), whether of Erming or Kuaiyuan; seedling stage, flowering stage, or fruits growing stage; top leaves, middle part leaves or bottom leaves. But the extent and the time of midday depression were different. The stomatal conductance, transpiratory rate, intercellular CO2 concentration, and air CO2 concentration of eggplant leave were decreased when midday depression was happened, but photosynthetic active radiation and leaf temperature were maximum. The reasons of midday depression of eggplant leaves were stomatal factors.

结果表明,茄子晴天Pn日变化无论品种是否相同、生育期是否相同、叶位是否相同(上部叶片、中部叶片和底部叶片),无一例外地表现为&双峰&曲线,即有光合&午休&现象存在,只是&午休&的时间和程度上有差异;光合&午休&时气孔导度、蒸腾速率、细胞间隙CO2浓度、大气CO2浓度均下降,而光合有效辐射和叶片温度此时几乎处于最大值,茄子光合&午休&是由气孔因素引起的。

The comparative research results showed that:(1)Thediurnal variation of the net photosynthetic rates in the aquatic leaves was a "double-peak", with an various "midday-decline", the time of the peak value appeared at about 10:00 A.M. and 13:00 P.M., while that in the xeric leaves was showed with invarious peak value and "midday-decline"; The diurnalvariation of transpiration ratesof both aquatic and xeric leaves appeared as a single-peak, the appearance time of peak value of the latter was earlier than the former and gradually decreased in the afternoon; The stomatal conductances appearance time of both of them were close to that of photosynthesisrate ,reached to the maximum in the morning and then gradually decreased: Diurnal variation of intercellular CO2 concentrationshows that: both aquatic and xeric leaves increased at first, and then exhibit a tendency of ascending within narrow range.(2) The net photosynthetic rates, photosyntheticallyactive radiation, stomatal conductances and transpiration ratesof both two kinds of leaves showed positive correlation, The correlation degree among them was prominent, there was significant negative correlation between The net photosynthetic rates and intercellular CO2 concentration.

研究结果表明:(1)水生叶片净光合速率的日变化曲线呈双峰型,出现明显的&午休&现象,峰值出现在10:00左右和13:00左右,但旱生叶片表现出的峰型和&午休&现象不明显;两种叶片的蒸腾速率日变化曲线表现为明显的单峰型,旱生叶峰值出现时间早于水生叶,中午过后逐渐下降;两种叶片气孔导度峰值出现时间和光合速率相近,均表现为上午升高至最高,随后逐渐下降的趋势;两种叶片胞间二氧化碳浓度日变化表现为:整体上先下降,然后有一上升趋势:(2)两种叶片的光合速率与光合有效辐射、气孔导度、蒸腾速率呈正相关,全部达到显著水平;光合速率与胞间CO2浓度显著负相关。

The results showed: 1 Alfalfas grown for different lengths of time had considerable influence on photosynthetic characteristics of which the most important was stomatal conductance followed by transpiration rate and the chlorophyll relative content. 2 Diurnal variation in Pn and Tr had two peaks, and an obvious midday depression. 3 The net photosynthetic rate was significantly positively correlated with photosynthetic radiation, stomatal conductance, the relative chlorophyll content, and transpiration rate. The net photosynthetic rate was significantly negatively correlated with intercellular CO2 concentration.

结果表明,1生长年限对苜蓿光合特性有较大的影响,对气孔导度的影响最大,其次是蒸腾速率和叶绿素相对含量。2苜蓿叶片净光合速率、蒸腾速率日变化均呈现&双峰&曲线,有明显的光合&午休&现象。3净光合速率与光合有效辐射、气孔导度、叶绿素相对含量呈极显著正相关,与蒸腾速率呈显著正相关,与田间CO2浓度呈极显著负相关。

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