农业环境科学学报2012，Vol.31Issue(10)：2060-2065,6.
不同通量计算方法对静态箱法测定农田N2O排放通量的影响
Impact of Different Flux-Calculation Methods on the N2O Fluxes from Cropland Measured with Static Chamber Technique
摘要
Abstract
Static chamber techniques have been used widely in characterizing N2O fluxes from arable lands. However, it is still open to question due to the inherent underestimation of fluxes, which have caused large difficulty in reducing the uncertainty associated with the N2O inventory and mitigation practices. In this study, the impact of LR, Quad and HM calculation techniques on the N2O fluxes were examined through measuring N2O fluxes from winter wheat soil with static chamber technique in one week after the N fertilization at shooting stage, and the impacts of N fertilization on N2O fluxes were examined as well. It was found that large variance among the N2O fluxes and patterns obtained with different calculation techniques were observed when using the same dataset, and the greatest coefficient of variation(C.V.) was up to 71%; in comparison with the C.V. of 29% before the correction, it was reduced to be 13% after the performance of TFU technique; it was also obtained that the N2O fluxes were all underestimated, where the underestimation of N2O fluxes by the LR, Quad and HM methods were 14%～31%, 5%～48% and 3%～62% for the N fertilized soil, and 14.9%～16.0%, 15.5%～35.2% and 8.4%～57.2% for the unfertilized soil, respectively. Therefore, the performance of the TUF technique has a great potential to minimize the difference of N2O fluxes calculated with different techniques and reduce the uncertainty associated with N2O fluxes, and such technique should be incorporated into the protocols of N2O quantification in the future.关键词
静态箱/冬小麦/排放通量/N2OKey words
static chamber technique/ winter wheat/ flux/ N2O分类
资源环境引用本文复制引用
石书静,高志岭..不同通量计算方法对静态箱法测定农田N2O排放通量的影响[J].农业环境科学学报,2012,31(10):2060-2065,6.基金项目
国家自然科学基金(41075105) （41075105）
