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Effects of Nutrient Addition on Soil Carbon Processes in Grassland Ecosystem

Author: XuShuXin
Tutor: GuoZuoFa
School: Shandong Normal University
Course: Environmental Science
Keywords: Grassland ecosystem Nutritional elements The process of soil carbon
CLC: S812.2
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 0
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Abstract


Since the industrial revolution, atmospheric concentrations of greenhouse gases increase global environmental change caused a serious threat to human survival and sustainable socio-economic development has become a major environmental problem of global strong concern. Grass as one of the more sensitive ecosystems respond to global change and human activities, greenhouse gas fluxes as well as the relationship with the global environment is increasingly attention has been paid. Of grassland ecosystem greenhouse gases and their impact mechanism, both grass ecosystem an important part of land - atmosphere interactions, and to ensure that our society's rapid economic development, promote the improvement of our living environment and perform the basic research of the Climate Change Convention. In this paper, the grassland is located in Duolun County - Institute of Botany, Chinese Academy of Sciences, Duolun restoration ecology experiments and demonstrations Research Station 13th Lane Beach experimental base for the study area, through field tests and laboratory simulation experiments, to study the nutritional elements add process of soil carbon in grassland ecosystems: through field tests on nutritious elements add a grassland ecosystem plant biomass and carbon storage and carbon-containing greenhouse gas flux; culture experiments by indoor simulation to study the nutritional elements Add a grassland ecosystem soil microbial biomass carbon, nitrogen and organic carbon mineralization. Provide the basic data for the use of grassland resources to improve the status quo of China's greenhouse gas emissions to reveal changes in grassland ecosystem greenhouse gas source / sink function. The main findings of this paper are as follows: add nutritional elements, each processing biomass differences are mostly not significant, the control biomass is the lowest, community biomass increased with the increase in the amount of nutrient elements add add The nutritional elements to promote the growth of plants, but of N exceeds a certain amount, the plant growth was suppressed. Underground layers biomass showed a progressively decreasing trend, ie \Below-ground biomass is mainly distributed in 0 1 0cm soil layer, 52.13% of the total biomass in an area under layers 6 2.43%. Total carbon storage of the plants on the ground and underground carbon storage of dynamic change in total plant biomass, above and below ground biological scales show the same variation. Nutritional elements add soil organic carbon does not significantly change, soil total nitrogen significantly with the increase; soil microbial biomass carbon, nitrogen occurred significant changes, various processing microbial biological amount the size of the order 10NPK gt; 20NPK gt ; PK gt; controls. 3. Nutritional elements are added, the the CO 2 generation rate of different treatments significantly different processing a 10NPK the CO 2 generation rate significantly higher than other treatments; to cultivate during different processing soil CO with culture changes are consistent with a logarithmic function of time; 2 generation rate of organic carbon mineralization rates vary in different months, July and August soil CO 2 generation rate significantly lower than in May and June, which are negatively correlated with the sampling of soil temperature and moisture conditions. Average cumulative mineralization of treated soils CO 2 cumulative emissions there are some differences, adding nutritional elements are promoted soil CO 2 emissions, different treatment order of 10NPK gt; 20NPK gt; PK gt; controls. Mineralization rate of soil organic carbon and microbial biomass carbon into a significant positive relationship. 4. The different treatment soil CO 2 Flux Characteristics are basically the same as the variation in the growing season, add nutritional elements has not changed the soil CO 2 emissions flux variations type. Average emissions of 10NPK significantly higher than other treatments in the different treatment, processing, followed by treatment 10N, N exceeds a certain amount, the CO 2 emissions reduction, CO 2 emissions by a certain inhibition. Treated soils CH 4 average flux of negative performance for atmospheric CH 4 exchange. Throughout the observation period, showing a growth of the beginning of the season and the growing season absorption CH 4 ability, the 67 Aug. soil absorption CH 4 weak capacity characteristics. Can promote soil CH 4 absorption, which deal with PK strongest uptake of atmospheric CH 4 ability to add nutritional elements.

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