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The Influence of Gap and Temperature on the CO2 and N2O Emissions and Nitrogen Mineralization of Temperate Forests

Author: DuanCunTao
Tutor: LiTuanSheng；XuXingKai
School: Chang'an University
Course: Physical Geography
Keywords: Greenhouse gas CO2 N2O Hydrothermal conditions Gaps
CLC: S714
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Broadleaved Mixed Forest in Changbai Mountain as the research object, by in situ observation gaps within the forest soil source of C02 and N20 flux mechanism different hydrothermal conditions on the forest soil source C02 and N20 emission flux. In addition, in order to strengthen the conditions of heat flux change caused by C02 and N20 gas, the study also select the original broadleaved Korean pine forest of the Changbai Mountain area in China, after Birch secondary forest and deforestation ginseng cultivation 0-10 cm, 10 - 20 cm and 20-30cm soil simulation study in the laboratory at 5 ° C, 15 ° C at 25 ° C and 35 ℃ conditions different soil carbon dioxide (CO2) and nitrous oxide (N2O) emission flux variation. The main results are as follows: in situ observation experiments show that: gaps and understory underground 5cm temperature and humidity is a significant difference. Observation period, CO2 and N2O flux with the season changes, the flux of CO2 emissions from forest larger than the gaps emissions peak in August; emission fluxes of N2O emission flux forest is far less than the gaps emissions peak in September. Through statistical analysis, that underground 5cm soil temperature are the main factors that affect CO2 fluxes, soil moisture and CO2 flux is a negative correlation between temperature response greater than the gaps within the forest soil. N2O flux by the humidity greater impact, and the temperature was a significant positive correlation between the gaps within the soil source N2O flux is greater than the temperature response Rinnai. Through the analysis of the experimental soil properties that between gaps and forest within the water-soluble carbon and nitrogen soil properties with larger differences. Correlation analysis, the results showed that the soluble organic carbon and nitrogen in soil properties, water-soluble organic carbon and nitrogen, microbial Carbon and Nitrogen content of CO2 and N2O emission flux has a significant correlation. Indoor temperature control culture experiments showed that: three types of land use, soil CO2 emission flux to the original broad-leaved Korean pine forest, Birch secondary forest and ginseng cultivation descending order, the N20 emission flux to the original broad-leaved Korean pine forest, ginseng cultivation descending order and Birch secondary forest, CO2 and N2O emissions are in the 0-10cm soil layer. Under the same level of water-filled porosity (WFPS) and temperature affect the impact factor of the three land use types different depth levels of soil CO2 and N2O flux, CO2 mutation rate, respectively, can be explained by statistical analysis, 68.8%, explained 56.6% of the N2O mutation rate. Through the analysis of the experimental soil properties, indicating that the temperature impact of CO2 and N2O flux through the impact of changes in the different forms of carbon and nitrogen in soil properties turn.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest soil science
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