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Diversity of Light Energy Utilization and Community Stability of Dominant Species in Quercus Liaotungensis Forest

Author: GuanJinHong
Tutor: ZhangWenHui
School: Northwest University of Science and Technology
Course: Forest cultivation
Keywords: Loess Plateau Liaodong oak forest Photosynthetic characteristics Functional group
CLC: S792.18
Type: Master's thesis
Year: 2010
Downloads: 73
Quote: 1
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Abstract

To clarify the the Liaodong oak forest light utilization diversity in the continued development of community as the research object, the typical semi-arid areas of the Loess Plateau Liaodong oak natural secondary forest, in Yan'an City Road, Forest Area select fixed, application LI-6400 portable photosynthesis system, were measured diurnal variation of net photosynthetic rate of the the forest different habitats inside and outside of the Liaodong oak forest strengths in different periods of the growing season; fitting the light response curves and photosynthetic parameters for analysis; their photosynthesis factor between multiple linear regression analysis; clustering analysis, the different periods of the growing season photosynthetic acclimation functional group to be divided. The main results are as follows: 5, Liaodong oak forest within the main advantages of kinds of maximum net photosynthetic rate, light saturation point, light compensation point, dark respiration rate and apparent quantum efficiency 5 photosynthetic parameters, the Liaodong oak forest within 16 advantage plant press The growing season in different periods are divided into different functional groups. Different periods of the growing season, the plant belongs to functional groups, each functional group in the the survival strategy 1,16 dominant plant growth environment, growing season, different periods inside and outside the forest photosynthetically active radiation diurnal variation trend showed a single peak mode; forest And after the diurnal variation of atmospheric CO2 concentration inside and outside the whole was a \decline was gentle single peak curve; forest inside and outside the relative humidity of the atmosphere basic trend was inverted parabola; forest internal and external soil moisture differences inside and outside the forest, but rose due to changes in the external climate, and showed greater differences. 2 different periods of the determination of the dominant species in the forest outside the growing season diurnal changes of photosynthetic mode bimodal \Diurnal variation of photosynthesis mode in the main forest tree species Liaodong oak in the forest also showed bimodal diurnal variation of photosynthesis mode understory five other dominant plants are mainly single peak, but also due to the different light environment in which each measurement object as well the outside weather canopy, such as the impact and bimodal. 3, multiple linear regression analysis showed that the forest inside and outside of the growing season in different periods in different habitats, stomatal conductance and intercellular CO2 concentration is the dominant factor affecting net photosynthetic rate, in addition, photosynthetically active radiation, atmospheric temperature, air humidity, water vapor pressure deficit impact of different plant species, different times and different habitats. Ecological factors may affect plant stomatal conductance and intercellular CO2 concentration and net photosynthetic rate of the indirect effects of plant leaves. The forest inside and outside the annual average photosynthetic capacity in descending order: tree layer gt; shrub layer gt; herbaceous layer. 4, 16 dominant species in different periods of the growing season photosynthetic ability to adapt to different habitats found light adaptation characteristics and energy use patterns of diversity is extremely rich the Liaodong oak forest within and outside the dominant plants. Of the same species in different habitat conditions, different plants in the same habitat conditions showed great differences. Light saturation point and light compensation point in between January and different habitat differences larger difference between dark respiration rate and apparent quantum efficiency of the month not, but I'm inside and outside. Different, to avoid competition, to achieve the maximum use of light resources, to ensure that the the Liaodong oak forests continue to more complex succession.

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