不同種植模式下土壤有機(jī)碳特性研究
[Abstract]:With the deepening of the international discussion on climate change, the ability of soil solid carbon emission reduction in farmland to cope with climate change has become the focus of scientific research at present. As one of the important modes of low carbon economy, organic planting has great potential in carbon sequestration and emission reduction. In this paper, the characteristics of carbon black carbon in organic and conventional planting modes were studied, and the dynamic changes of carbon and its components in two planting modes were compared by location research. The distribution characteristics of carbon and its components in the agglomerate were determined in two planting modes, and the carbon sequestration mechanism of soil was discussed from the point of physical chemistry. The carbon characteristics of the carbon and its components under organic and regular planting modes were compared. The above research aims at exploring whether organic cultivation has the ability to deal with climate change, thus further promoting the sustainable development of agriculture in China. Long-term positioning of carbon and its components in organic and regular planting modes showed that after 10 years of organic planting, the physical and chemical properties of soil were improved, organic matter, total nitrogen, effective phosphorus and quick-acting potassium were higher than those of regular planting. Other nutrient indicators were decreased in varying degrees. The activities of peroxidase and multi-phenol oxidase in organic planting mode were 2.66, 0.098 mg and g-1 路 2h-1, respectively, and the two kinds of enzyme activities were 1.64, 0.67mg without food additive g-1 路 2h -1, respectively. The organic matter, the recombinant organic matter and the active organic matter in the organic planting soil were all higher than those of the conventional, and the trend of increasing year by year was from 21. 52 g 路 kg -1, 20. 75 g 路 kg -1 and 5.93 g 路 kg -1 in 2004 to 30. 94 g 路 kg -1, 28. 29 g 路 kg -1 and 7. 83g 路 kg -1 in 2013 respectively. Organic matter increased slowly in the early stage of organic planting, and the growth of organic matter increased significantly after 5 years. In 2009, the organic matter decreased slightly from the beginning of 2011, and the organic matter increased relatively gently. From the long-term positioning test, the organic planting model promotes the increase of organic matter and its component content, which is beneficial to improving soil enzyme activity and promoting the development of organic carbon from active organic carbon to more stable humic acid. By comparing the composition, distribution and agglomeration of organic carbon components in soil aggregates under the two different planting modes of organic and conventional plants. The results showed that with the decrease of agglomerate size in the conventional planting mode, the mean content of the four fractions (1 mm, 1 ~ 0.5 mm, 0. 5 ~ 0. 25 mm and 0. 25 mm) were 23. 75%, 15. 15%, 19. 98% and 38. 09%, respectively. The percentages of 0. 5 ~ 0. 25 mm and 0. 25 mm were 9.73%, 18.41%, 24.46% and 43. 90% respectively, and the percentage content of microaggregates was significantly higher than that of conventional planting. The organic planting model increased the total nitrogen content and the mean value of 17. 95g 路 kg-1 and 1.51 g 路 kg-1, respectively. The average content of the recombinant organic carbon in the agglomerate was significantly higher than that of the conventional planting in the organic planting mode, and the recombinant organic carbon was enriched in the micro-aggregates of the main storage sites of 0. 25 mm of the stable organic carbon. In the organic planting mode, the content of easily oxidized carbon in the 1 mm large aggregate was significantly higher than that of conventional planting, and there was no significant difference between the other fractions, and the easily oxidized carbon was enriched in the 1 mm large aggregate. the organic planting mode increases the content of the organic carbon and the components thereof, relieves the damage of the cultivation on the aggregates, enhances the stability of the organic carbon, and is favorable for the solid carbon of the soil. The content distribution of iron-aluminum oxide in each size agglomerate is not obvious, and it may not play a major role in the chemical stability of organic carbon on the farm iron-aluminum oxide. The characteristics of carbon in organic and regular planting patterns in different regions were different from those of planting area, planting crops and planting years. There was no significant difference in organic carbon, recombinant organic carbon and easily oxidized carbon content in three regions of organic carbon, recombinant organic carbon and easily oxidized carbon in three years of organic planting years (P0.05). The three indexes of Shandong and Yunnan were significantly higher than those of the conventional ones (P0.01). With the increase of organic planting years, the difference between organic and conventional C/ N ratio is large. Organic carbon in two planting modes has a significant positive correlation with the recombinant organic carbon and the easily oxidized carbon. In the organic planting mode, with the increase of the organic carbon content, the carbon accumulation of the recombinant part and the active part is faster, and the accumulation of the recombinant part is faster than that of the active part.
【學(xué)位授予單位】:南京農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:S153.6
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