生态环境学报Issue(8)：1372-1377,6.
吉林西部盐碱水田区全球变暖潜势研究
Estimation of Global Warming Potential in the Saline-alkali Paddy Fields of Western Jilin
摘要
Abstract
In order to explore the western Jilin land consolidation project's contribution to regional-wide warming, based on the measured data of paddy soil greenhouse gases, the analysis of regional greenhouse gas emissions, a scientific basis for assessing the impact of paddy development on global warming had been provided. With the method of combining field sampling and region experiments, taking saline-alkali paddy field of Jilin province as an investigation object, of 0~30 cm surface soil samples of paddy were collected back to the experiments field. Pits with the size of 100 cm × 100 cm × 50 cm were digged in the field, after laying plastic sheeting at the bottom of the pits, the soil taking back from the sampling points were filled into the pits, watering, planting rice. Six plots were filled with different developed age soil, their disposal model was the same as QianGuo's local water and fertilizer management, drainage.was digged around the plots To research the greenhouse gas emission and contribution in the paddy, estimate GWP in the area, CH4, CO2 and N2O that released by soil during rice growth period were monitored by Static box - gas chromatography. combine The greenhouse gas GWP contribution was analysised combined with thirty years paddy area change. The results show that different development age total value greenhouse gas emissions (CO2-eqv) during paddy growing appeared an increasing trend, in the development process paddy CO2, CH4 and N2O emissions of greenhouse gases contribution rate for each period has a certain change, CO2 emissions contribution rate is dominant about 80%, CH4 contribution rate 16.69%~20.39%, is N2O 14 to 22 times, indicating CH4 emissions have a great comprehensive contribution on study area .In early paddy, N2O has higher contribution rate compared to mature paddy. In the rice growing vigorous period, CO2 contribution rate was decreased obviously, CH4 contribution rate was increased significantly, N2O contribution rate changed little. CH4 and N2O contribution rate is small in mature stage and returning green stage, which, apart from maturity stage the newly developed paddy CH4 contribution rate, CO2 contribution rate has dropped and fell significantly, the proportion of the contribution to greenhouse gas CH4 increase, much higher than N2O in this period. In mature stage three greenhouse gas contribution rate compared with other periods changed greatly, CH4 than N2O has a slight advantage, CO2 makes a recovery percentage to 95%. This is mainly with changes in soil conditions, In the rice growing vigorous period, waterlogged layer provides a good soil microbial anaerobic conditions, makes CH4 contribution rate increase.In mature stage shallow water layer and draining off, the dry conditions are not conducive to CH4 emissions, N2O is basically trace gas compared to the CO2 which produced by mature plant respiration more than photosynthesis. The total GWP in the study area continue to increase, and the growth rate was the same with the area of paddy field increased trend. The newly developed paddy contributed significantly to the greenhouse effect, which with the development of rice farming in nearly 20 years in the study area has a direct relationship. It shows that large-scale development in the western area of Jilin saline paddy has made some contribution to regional warming.关键词
盐碱水田/温室气体/GWP/贡献率Key words
saline-alkali paddy field/greenhouse gas/GWP/contribution rate分类
资源环境引用本文复制引用
汤洁,方天儒,赵仁竹,梁爽..吉林西部盐碱水田区全球变暖潜势研究[J].生态环境学报,2014,(8):1372-1377,6.基金项目
国家自然科学基金项目（40871088；51179073）；高等学校博士学科点专项科研基金项目 （）
