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Study on Photosynthesis Characteristics of Two Dominant Species in Evergreen Broad-leaved Forest in Maofeng Mountain of Guangzhou

Author: XuMeng
Tutor: ChenBuFeng
School: Chinese Academy of Forestry
Course: Ecology
Keywords: Photosynthetic rate Transpiration rate Stomatal conductance Physiological and ecological factors Seasonal changes Model
CLC: S718.4
Type: Master's thesis
Year: 2009
Downloads: 122
Quote: 1
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Abstract


This article uses the LI-6400P portable photosynthesis meter forest ecosystem observation, comparison experiments and system analysis method, two advantages of Maofeng evergreen broad-leaved forest tree species photosynthetic characteristics and environmental factors to carry out the typical seasonal weather natural state and control state of continuous long periods positioning observational studies. Analysis of the two dominant tree species in the gas exchange parameters and responses to light, CO2 response parameters diurnal variation of and seasonal differences. The two dominant tree species in different seasons of the gas exchange parameters with physiological and ecological factors. Dynamic simulation of the relationship between gas exchange parameters with major environmental meteorological factors. Build a major gas exchange parameters of light response model, compare the suitability of different photosynthetic light response and CO2 response model. The main findings are as follows: 1, sunny weather conditions, China Nan diurnal variation of net photosynthetic rate curve for a single peak, China cone bimodal. Average net photosynthetic rate of the the China Nan rainy season sunny 10.08μmol · m-2 · s-1, maximum 14.56μmol · m-2 s-1, the night the average dark respiration rate 1.25μmol · m-2 · s-1; during the dry season sunny average net photosynthetic rate 6.76μmol · m-2 · s-1, the maximum 11.31μmol · m-2 · s-1, the average dark at night breathing rate 0.57μmol · m-2 · s-1. The average net photosynthetic rate of China cone rainy season sunny 8.52μmol · m-2 · s-1, maximum 12.94μmol · m-2 · s-1; 7.28μmol · m-2 · s-1 average net photosynthetic rate of the dry season sunny the maximum 12.95μmol · m-2 · s-1. In addition to the light use efficiency difference was not significant, the two kinds of photosynthetic rate, transpiration rate, stomatal conductance and water use efficiency in the dry season and the rainy season, significant differences in the rainy season, the photosynthetic rate, transpiration rate and stomatal conductance than the dry season, water use efficiency is less than the dry season. 2, the the Chinese cone rainy season photosynthesis \3, correlation analysis, stepwise regression analysis and path analysis method of combining the different seasons affect net photosynthetic rate and transpiration rate of physiological and ecological factors, the main influencing factors Sort establish the optimal model. Major factor during the dry season affect the China Nan net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and light intensity, the rainy season is the intercellular CO2 concentration, stomatal conductance, atmospheric CO2 concentration and light intensity; during the dry season the main factor to affect the China Nan transpiration rate light intensity, atmospheric temperature, stomatal conductance and atmospheric CO2 concentration, relative humidity during the rainy season, stomatal conductance and light intensity. Major factor during the dry season is affecting China cone net photosynthetic rate, stomatal conductance, vapor pressure deficit, light intensity and intercellular CO2 concentration; rainy season intercellular CO2 concentration, light intensity, atmospheric temperature, stomatal conductance; affect China cone transpiration rate the main factor of the dry season is the stomatal conductance and atmospheric temperature, the rainy season is stomatal conductance and vapor pressure deficit. Points drought rain and autumn, respectively, of the two kinds of net photosynthetic rate, transpiration rate and stomatal conductance and meteorological environmental factors in simulation are given a specific form suitable for the different seasons of different kinds of model. Different models comparison: China Nan dry rainy season net photosynthetic rate can be fitted by binary quadratic, and unary six equations, transpiration rate, respectively, through the establishment of a cubic equation and binary quadratic fit, stomatal conductance respectively by the build Jarvis model and the Ball-Berry correction model; net photosynthetic rate, China cone dry season and the rainy season transpiration rate by the linear regression equation can better simulate the net photosynthetic rate changes, dry rainy season simulation stomatal conductance most good model are constructed the Jarvis model and modified model of the Ball-Berry. 5, two kinds of photosynthetic light response and photosynthetic CO2 response parameters in the dry season and the rainy season, there is a big difference, photosynthetic capacity (Pmax), maximum carboxylation rate (Vcmax) and maximum electron transport rate (Jmax), apparent quantum efficiency (α), light saturation point (Qsat), light compensation point (Qcomp) and CO2 compensation point (Ccomp) are the rainy season is greater than the dry season, carboxylation efficiency (CE) are the dry season than during the rainy season. Two kinds of dark respiration rate (Rd) differences in dry rainy season, the China Nan rainy season is greater than the dry season, China Cone dry season is greater than the rainy season. Same season the Chinese cone photosynthetic capacity (Pmax), maximum carboxylation efficiency (Vcmax), maximum electron transfer inefficiency (Jmax), apparent quantum yield (α), light compensation point (Qcomp), and CO2 compensation point (Ccomp) China Nan. , While the rainy season is less than China Nan Nan greater than in the dry season China cone carboxylation efficiency (CE) and dark respiration rate (Rd) China. The same seasons two kinds of light saturation point (Qsat) or less. 6, photosynthetic light response parameters there are significant changes in the day. China cone rainy season apparent quantum efficiency (α) gradual increase in the morning, 11:00 peak, and then began to decrease, 13:00 reached the lowest value, after 13:00-17:00 gradually increasing trend of the light compensation point (Qcomp) opposite apparent quantum efficiency α. Light and capacity (Pmax) reaches its maximum at 11:00, trough dark respiration rate (Rd) appeared at 13:00. 7 different photosynthetic light response and photosynthetic CO2 response model photosynthesis light response the new model is better than the hyperbolic simulation model. 8, to build a model of the light response of stomatal conductance and transpiration rate, analysis of the main response parameter maximum stomatal conductance and transpiration rate of the diurnal variation of seasonal differences. The China Nan dry rainy season maximum stomatal conductance, respectively, 0.13 mol · m-2 · s-1 and 0.57 mol · m-2 · s-1, China cone dry rainy season maximum stomatal conductance of 0.1 mol · m-2 · s -1 and 0.45 mol · m-2 · s-1. The China Nan dry season transpiration rate is 2.91 mmol · m-2 · s-1, China the cone dry season transpiration rate is 2.24 mmol · m-2 · s-1.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Dendrology
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