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Stable Carbon Isotope Compositions in C3 、C4 Herbaceous Plants and Their Responce to Changing Temperature

Author: LiJiaZhu
Tutor: LiuXianZhao；WangGuoAn
School: Lu Tung University
Course: Physical Geography
Keywords: Plant stable carbon isotope Temperature Temperature control experiment Northern ecotone Response mechanism
CLC: Q945
Type: Master's thesis
Year: 2009
Downloads: 237
Quote: 2
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Abstract


Plant stable carbon isotope (δ 13 C) to provide a theoretical basis for extracting reliable paleoenvironmental and paleoecological information and research base, \However, in the context of increasing \scholars have failed to give a reasonable and adequate explanation. Thus, the size of the plant carbon isotope temperature coefficient is still not reached a consensus, the temperature of the mechanism is not yet clear, the temperature effect is still controversial in the current environmental factors and plant stable carbon isotope relations research hotspot. Based on this, this study adopts the the artificial control experiments and field sampling method of combining five temperature is set to handle the the four kinds C 3 herbs and three C 4 herb manual temperature control cultivation, collection of plant samples of precipitation in northern China Ecotone from east to west along the 400 mm line, with the help of the natural temperature gradient, systematically explore C 3 < / sub>, C 4 herb carbon isotope composition of its response to temperature change trend, from the perspective of plant physiology, nutrition element content and try on the Temperature on plant δ 13 C mechanism is explained, the purpose is to determine plant δ 13 C temperature coefficient and reveal the plant δ 13 C temperature response mechanism to further reveal the modern plant δ 13 C on the response of the climate parameters, and provide a theoretical basis and research basis for quantitative applications of carbon isotopes in the study of paleoclimate, and paleoecology. The main conclusions are as follows: indoor experiments, four C 3 4 the plant δ 13 C value distribution were in the range of -28.31 ‰ - 32.32 ‰ and -14.39 ‰ - 18.27 ‰. Distribution of wild collected the C 3 , C the 4 plant samples δ 13 C values ??in -24.32 ‰ - 32.76 ‰ and -10.50 ‰ - 15.58 ‰ scope predecessors obtained within the range. C 3 C 4 plant δ 13 C range no coincidence, in order to verify the photosynthetic pathway affect plant carbon isotopic composition of the most fundamental factor. But the indoor test range obtained compared with the field sample analysis results, C 3 plant δ 13 C range is narrow, the C 4 plant δ 13 C values ??relatively negative, which may be related to the selection of the test species and the number of plant species studied. 2, indoor test results show that the C 3 the C 4 plant overall δ the 13 C were with increasing temperature and a faint lighter trend the coefficient of variation were -0.017 ‰ / ℃ and -0.036 ‰ / ° C, but a single species δ 13 C temperature trend not consistent; analysis of field samples, C 3 plant δ 13 C and temperature between the existence of a significant positive correlation between δ 13 C with temperature changes, the temperature coefficient of 0.11 ‰ / ° C, but C 4 plant δ 13 C and temperature correlation. Indoor trials, intercellular carbon dioxide concentration and the ratio of the concentration of atmospheric carbon dioxide (ci / ca), C 3 more sensitive response of the carbon isotope composition of plants, while the C 4 plant δ 13 C change is relatively weak, indicating that the ci / ca affect C the 3 plant carbon isotope fractionation of the most critical factors, and for C 4 plants, except ci / ca, isotope fractionation is also affected by the value of φ (C 4 photosynthesis process within the sheath cells C 4 dicarboxylic acid release and leaked part of the CO2 is not Rubisco carboxylation Back to mesophyll cells, this part of the CO 2 share entire C 4 dicarboxylic acid release CO 2 ratio); C the Plant / sub> δ 13 C with SLA ( Specific Leaf Area, specific leaf area) is inversely proportional to the overall trend. 4, according to the analysis of field samples, between the the plant leaves SLA and temperature without correlation, indicating that the SLA not affect the the plant δ 13 C temperature change causes; sampling sites in soil N content has decreases with increasing temperature trend, but C 3 C 4 plant the overall leaf N content and temperature correlation, this may be due to the low temperature to reduce soil N available; the three C 3 plant species and two C 4 species based on the N content of the leaf area (Narea) and leaf dry weight N-based Content (Nmass) analysis, the results show that increasing temperature increases and no significant change Narea, and Nmass have different modes, and plant leaf thickness did not change significantly with temperature-related, also may be related to the study area, the average annual temperature range the plant species δ 13 C and leaf N content relationship also showed a different mode increases or no significant change, suggesting that in the application of plant leaf N content and δ and species differences; 13 C values ??between both consider the plant leaf N content and photosynthetic N use efficiency. 5, the analysis of the relationship between the elements of the field study area plant samples carbon isotopic composition with altitude, longitude, latitude geospatial found C 3 the plant δ 13 C values ??and altitude highly significant positive correlation, the rate of change of 1.3 ‰ / km, a significant negative correlation with longitude, latitude, longitude and latitude of each increased 1 degree C 3 plant δ 13 C value partial negative 0.11 ‰ and 0.097 ‰, the temperature study area impact plant δ 13 C with geographic variables change key factors. C 4 plant δ 13 C value of the three geographic variables did not show a linear relationship.

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