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Variation Character of Main Greenhouse Gas (CH4 and CO2) from Inner Mongolia Typical Temperate Steppe

Author: WangJiMing
Tutor: ZhouShouBiao；WangZhiPing
School: Anhui Normal University
Course: Botany
Keywords: Temperate grassland L. chinensis Saudi Greenhouse gas Flux Variation of
CLC: S812
Type: Master's thesis
Year: 2010
Downloads: 91
Quote: 0
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Abstract


Grassland ecosystem is an important type of terrestrial ecosystems. With various eco-systems environment, temperate grassland ecosystems and desert steppe of Leymus chinensis steppe ecosystem is one of the major ecosystems. In this paper, a static box (black-box) Technical and by gas chromatography, Leymus chinensis in Inner Mongolia temperate grassland ecosystem plot and sandy plots of the main greenhouse gas fluxes diurnal variation and annual variation analysis and comparison to explore the sheep grass prairie ecosystem and desert steppe ecosystem of the total budget amount of greenhouse gas emissions, and in-depth understanding of the ecosystem to provide experimental data on greenhouse gas flux. The results are as follows: 1. Sandy plots, CH 4 flux value is negative, the September 19, 2008, CH 4 flux Duty The changes range from -0.1315 to -0.02841 mg CH 4 · m -2 · h -1 CH 4 Day flux average -0.0684 mg CH , 4 · m -2 · h -1 ; August 23, 2010, CH < sub> 4 flux Duty changes range from -0.25782 to -0.02225 mg CH 4 · m -2 · h -1 . 4 the average Day flux -0.1148 mg CH , 4 · m -2 · h -1 . Saudi plots, CO 2 flux value is positive, September 19, 2008, CO 2 flux Duty range from 89.31595 to 191.1538 mg CO -2 · m -2 · h -1 , the average CO 2 Day flux 131.6391mg the CO 2 · m -2 · h -1 ; August 23, 2010, CO 2 flux The duty changes range from 205.0719 to 529.149 mg CO 2 · m -2 · h -1 the CO 2 Day flux average 347.7160mg CO 2 · m -2 · h -1 . According to a circadian variation in grassland plants growing season 0900-10: 00 and the average time of the time period the average value of the flux of the greenhouse gases may represent a 24-hour period 16:00-17:00 two. Plant growth season, the higher the temperature, the lower the absolute value of the CH 4 flux, the higher the absolute value of the CO 2 the flux. Saudi CH 4 absorption associated temperature limit up and down in the afternoon and early morning. From August to September, the green plants gradually litter, green plant litter a greater impact on the CO 2 emission flux, and CH 4 absorption flux than small. 2. L. chinensis plots, CH 4 flux can also be negative. Grass control cell the CH 4 flux years range from -0.2200 to -0.0648 mg CH , 4 · m -2 · h -1 , CH 4 the annual flux average -0.1602 mg CH , 4 · m -2 · h -1 ; the the bare land district CH 4 flux years range from -0.1534 to -0.0890 mg CH 4 · m -2 · h -1 , CH 4 annual flux averages -0.1336 mg CH -4 · m -2 · h -1 . L. chinensis grasslands can be as the atmospheric CH 4 exchange. Grass control cell CO 2 flux annual range from 27.3008 to 325.2815 mg the CO 2 the -2 · h - 1 , CO 2 annual flux average of 216.4107 mg CO , 2 the -2 · h -1 ; bare land plot CO 2 flux years range from 30.4408 to 215.7496 mg the CO 2 the -2 -1 , CO 2 annual flux averages 144.4512 mg CO , 2 · m -2 · h < sup> -1 . CH 4 absorption flux and CO 2 emissions flux trend is significantly greater than in the spring and summer, autumn and winter; grass control district each month and the average annual CO 2 basic emission flux values ??are greater than the plot of bare land, and has a significant difference between the part of the month between the two cell. Plant growth condition for CO 2 emission flux will have a significant impact. 3. Sandy CH 4 flux years range from -0.1020 to -0.0334 mg CH 4 · m -2 · h -1 , CH 4 annual flux average value of -0.0654 mg CH , 4 · m -2 · h -1 ; the sandy CO 2 flux values ??for the year range from 24.3079 to 448.7114 mg CO 2 · m -2 · h -1 , CO 2 annual flux averages 213.9506 mg CO , 2 · m -2 · h -1 . Assessment of temperate grassland ecosystem affect the total amount of greenhouse gas sandy CH 4 absorption flux significantly, while the the sandy CO 2 emissions flux no significant effect. Temperate grassland ecosystem, grassland and sand are greenhouse gases CH 4 exchange. The analysis showed that plant biomass and growth as well as soil physical and chemical properties and soil microbial CH 4 CO 2 fluxes have a significant impact, including CH 4 flux is particularly prominent. Changes in the ecological environment of the main greenhouse gases CH 4 absorption flux and CO 2 emissions fluxes influence, attention should be paid.

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CLC: > Agricultural Sciences > Livestock, animal medicine,hunting,silkworm,bee > General Animal Science > Grassland Science,prairie school
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